A Micro-Mechanical Simulation of Sand Liquefaction Behavior by DEM
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3D CFD simulation of bottle emptying processes容器排空过程的三维CFD模拟A 3-D computational fluid dynamics model for forced air cooling of eggs placed in trays强迫空气冷却纸盘中鸡蛋的流体力学3-D计算模型A kinetic study of the release of vanillin encapsulated in Carnauba wax microcapsules香兰素封装在巴西棕榈蜡微胶囊中释放的动力学研究A machine vision system for identification of micro-crack in egg shell鉴别蛋壳细微裂缝的机器影像系统On the usage of acoustic properties combined with an artificial neural network – A new approach of determining presence of dairy fouling利用声学特性结合人工神经网络-鉴定乳产品存在污染的一种新方法A potentiometric electronic tongue for the discrimination of honey according to the botanical origin. Comparison with traditional methodologies: Physicochemical parameters and volatile profile根据原植物用电子舌的电位差区别蜂蜜.与传统方法:理化性参数和挥发性进行对比A rapid method to discriminate season of production and feeding regimen of butters based on infrared spectroscopy and artificial neural networks 一个基于红外光谱和人工神经网络来区分季节性生产和黄油供给方案的快速方法A review: Crispness in dry foods and quality measurements based on acoustic–mechanical destructive techniques评审:基于声音仪器的破坏性试验对干燥食品酥脆度和质量的测量Aeration of model gels: Rheological characteristics of gellan and agar gels凝胶通气模式:结冷胶和琼脂凝胶的流变学特性Agglomeration of durum wheat semolina: Thermodynamic approaches for hydration properties measurements硬质小麦粗面粉的凝聚:热力学方法对于水合性能的测量Alleviating bottlenecks in a microbiology laboratory减少在微生物实验室中的瓶颈Effect of the amount of steam during baking on bread crust features and water diffusion面包在烘烤期间蒸汽对面包表皮特征和水扩散的影响An enzyme sensor for the determination of total amines in dry-fermented sausages一种酶传感器在腊肠风干发酵中对总有机胺的决定性An improved model of the seeded batch crystallization of glucose monohydrate from aqueous solutions从含水的溶解液中分批处理去籽的结晶化葡萄糖一水合物的一种改良模式An RFID application in the food supply chain: A case study of convenience stores in Taiwan无线射频识别在食品供应链中的应用:台湾便利储藏的案例研究Analytical model for variable moisture diffusivity estimation and drying simulation of shrinkable food products分析模型对可变湿度扩散性的估计和可收缩食品的干燥模拟Anthocyanin degradation kinetics during thermal and high pressure treatments of raspberries红草莓在高压和热处理下花青素退化的动力学Application of hybrid image features for fast and non-invasive classification of raisin图像特征混合对葡萄干快速和非侵入分类的应用Application of NIR hyperspectral imaging for discrimination of lamb muscles近红外高光谱对识别羔羊肌肉的应用Aqueous extraction of anthocyanins from Hibiscus sabdariffa: Experimental kinetics and modeling从洛神花中萃取花青素的实验历程和建模Aseptically packaged UHPH-treated apple juice: Safety and quality parameters during storage无菌包装超高压均质处理苹果汁:储藏中的安全与质量参数Automatic freshness assessment of cod (Gadus morhua) fillets by Vis/Nir spectroscopy利用可见近红外光谱对鳕鱼(大西洋鳕)鱼片新鲜度的自动评估Beer quality screening by FT-IR spectrometry: Impact of measurement strategies, data pre-processings and variable selection algorithms傅里叶变换红外光谱学光谱测定法对啤酒品质的筛选:测量方法,数据预处理和多变的算法选择对测量的影响Calcium effect on mechanical properties of model cell walls and apple tissue钙对典型细胞壁和苹果组织机械性能的作用CFD model development and validation of a thermonebulisation fungicide fogging system for postharvest storage of fruit热雾化杀菌剂系统对采收后食品储藏计算流体动力学模型的发展和确立Changes in orange juice characteristics due to homogenization and centrifugation橘子饮料特性因均化作用和离心分离所出现的变化Characterization and antimicrobial activity studies of polypropylene films with carvacrol and thymol for active packaging聚丙烯薄膜附加香芹酚和百里香酚对活性包装的表征和抗菌活性研究Characterization of bread dough: Rheological properties and microstructure面包面团的特性表述:流变性能和微观结构Coffee beans microstructural changes induced by cultivation processing: An X-ray microtomographic investigation种植加工引诱咖啡豆微观结构的变化:X射线微观层析成象的调查Combination of digital images and laser light to predict moisture content and color of bell pepper simultaneously during drying在干燥情况下,利用数字图像和激光灯的结合对灯笼椒的水分含量和颜色同时进行预测Comparative study of film forming behaviour of low and high amylose starches using glycerol and xylitol as plasticizers利用丙三醇和木糖醇作为增塑剂在高低直链淀粉质食品薄膜形成状况的对比性研究Comparison of total milk-clotting activity measurement precision using the Berridge clotting time method and a proposed optical method对比利用贝里奇凝固时间的方法和拟议光学方法对牛奶凝固活度的测量精度Compressive textural attributes, opacity and syneresis of gels prepared from gellan, agar and their mixtures压缩性组织的特性,从结冷胶,琼脂以及它们的混合物中凝胶准备的不透明度和脱水收缩作用Computer simulation model development and validation for radio frequency (RF) heating of dry food materials无线电频率对干燥食物材料加热的计算机模拟模型的发展和验证Crispiness of a microwave-expanded imitation cheese: Mechanical, acoustic and sensory evaluation微波扩大人造干酪的松脆物:力学,声学和感官评价Classification of black tea liquor using cyclic voltammetry利用循环伏安法对红茶白酒的分类Determination and removal of malondialdehyde and other2-thiobarbituric acid reactive substances in waste cooking oil检测和去除废弃食用油中丙二醛和其他2-硫代巴比土酸的反应物Determination of anthocyanin concentration in whole grape skins using hyperspectral imaging and adaptive boosting neural networks利用高光谱影像和适应促进神经网络测定全部葡萄皮中花青素浓度Determination of translucent content in mangosteen by meansof near infrared transmittance利用近红外透光率的方法对山竹果透明率的检测Development of a novel method to measure the film thickness of cured can coatings一个对腌罐头镀膜薄膜厚度测定新方法的发展Dielectric properties of sea cucumbers (Stichopus japonicus ) and model foods at 915 MHz典型食品和海参(刺参)在915MHz下的介电性能DMA peaks in potato cork tissue of different mealiness动态力学分析法在不同粉性的土豆软木组织的应用Influence of drying and hydrothermal treatment of corn on the denaturation of salt-soluble proteins and color parameters干燥和热处理玉米在可溶性盐蛋白和颜色参数变性上的影响Drying characteristics of mango slices using the Refractance Window™ technique芒果切片的干燥特性在折射窗薄层干燥技术上的应用Drying kinetics using superheated steam and quality attributes of dried pork slices for different thickness, seasoning and fibers distribution干燥动力学利用干燥猪肉切片的过热蒸汽和品质特性对不同厚度,风干和纤维分布的应用Dynamic oscillatory rheological measurement and thermal propertiesof pea protein extracted by salt method: Effect of pH and NaCl利用盐法对豌豆蛋白萃取的动态震荡流变测量和热性能:PH和盐的作用Dynamic oscillatory shear properties of O/W model system meat emulsions: Linear viscoelastic analysis for effect of temperature and oil concentration on protein network formation油水比率的动态振动剪切性能模型系统肉乳剂:线性粘弹性分析对温度和含油浓度在蛋白质网状形成的影响Effect of dimensions and geometry of co-field and co-linear pulsed electric field treatment chambers on electric field strength and energy utilization在电场强度和能量利用上共线性和共面性电场脉冲处理chambers的尺寸规模和几何体的影响Effect of high or low molecular weight of components of feed on transmembrane flux during forward osmosis促进渗透期间以跨膜通量为能源成分的分子量的高或低的影响Effect of morphology on water sorption in cellular solid foods. Part II: Sorption in cereal crackers水吸附在多细胞固体食品形态学的影响第二部分:吸附谷类饼干的吸附Effect of morphology on water sorption in cellular solid foods.Part I: Pore scale network model水吸附在多细胞固体食品形态学的影响第一部分:气孔比例网状模型Effect of salt and sucrose content on dielectric properties and microwave freeze drying behavior of re-structured potato slices盐和蔗糖含量对土豆切片复合组织介电性能和微博冷冻干燥的影响Effect of some operating variables on the microstructure and physical properties of a novel Kefir formulation一些运行变量对新克菲尔构想的微观结构和物理性能的影响Effects of electroplasmolysis treatment on chlorophyll and carotenoid extraction yield from spinach and tomato电质壁分离对菠菜和番茄中叶绿素和类胡萝卜素提取率的影响Effects of vacuum frying on structural changes of bananas真空油炸对香蕉结构变化的影响A finite element model for mechanical deformation of single tomato suspension cells一种对于单一番茄悬浮细胞的机械变形的有限元模式Enhanced survival of spray-dried microencapsulated Lactobacillus rhamnosus GG in the presence of glucose提高在葡萄糖前将装入乳酸菌鼠李糖GG的微胶囊进行喷雾干燥的残余物Enzymatic browning in sliced and puréed avocado: A fractal kinetic study 鳄梨和切片中的酶促褐变:一种分形动力学研究Enzyme inactivation kinetics and colour changes in Garlic (Allium sativum L.)blanched under different conditions在不同条件下大蒜变白中酶失活动力学和颜色的变化Evaluating banana ripening status from measuring dielectric properties利用介电性能测量香蕉成熟状况的评估Evaluating non-stick properties of different surface materials for contact frying不同表面材料的非粘性对接触油炸的评估Evaluation of Photoshop software potential for food colorimetry Photoshop软件对食品比色法可能性的评估Fast determination of boiling time of yardlong bean using visible and near infrared spectroscopy and chemometrics利用可见和近红外光谱学以及化学计量学快速测定长豇豆的沸腾时间Feasibility of NIR spectroscopy for non-destructive characterizationof table olive traits近红外光谱对表橄榄特性无损检测的可行性Food supply chain leanness using a developed QFD model食品供给链缺乏使用一种成熟的质量功能展开模式Fractal analysis of the retrogradation of rice starch by digital image processing利用数字图像处理米粉糊液凝沉的分形分析Frequency- and temperature-dependent dielectric properties of fruit juices associated with pasteurization by dielectric heating利用电介质加热杀菌法与果汁中与温度和频率有关的介电性能的相关性Development of a rapid, non-destructive method for egg contentdetermination in dry pasta using FT-NIR technique利用傅里叶变红外光谱技术测量鸡蛋内部的一种快速无损检测方法的发展Gelation properties of chicken myofibrillar protein induced by transglutaminase crosslinking利用转谷氨酰胺酶交联诱导鸡肉肌原纤维蛋白的胶凝特性Generalized microstructural change and structure-quality indicators of a food product undergoing different drying methods and conditions一种食品经过不同条件下和不同干燥方法的一般性微观结构变化和结构性能质量指标Glass transition phenomenon on shrinkage of papaya during convective drying木瓜在对流干燥期间玻璃转化现象的收缩Effect of saccharides on glass transition temperatures of frozen and freeze dried bovine plasma protein糖类在冷冻和冻结干燥牛血浆蛋白的玻璃转化温度的影响Heat transfer modelling in a refrigerated display cabinet: The influence of operating conditions冷藏展示柜的热传递模型:操作条件的影响Specific volume and compressibility measurements of tomato pasteat moderately high pressure as a function of temperature番茄酱在适当高压下作为温度函数比容和可压缩性测量Hybrid mixture theory based moisture transport and stress development in corn kernels during drying: Coupled fluid transport and stress equations基于在干燥期间玉米粒水分运输和压力发展的杂交混合理论:耦合流体运输和压力方程式Hydrodynamic, thermo-analytical and molecular structural investigations of enzyme interesterified oil and its thermo-oxidative stabilityby thermogravimetric analysis利用热重量分析对酯化油和其热氧化稳定的流体力学,热解析和分子结构的分析Classification of fresh Atlantic salmon (Salmo salar L.) fillets stored under different atmospheres by hyperspectral imaging利用高光谱影像对新鲜大西洋鲑鱼切片在不同气压下储藏的分类Imaged based estimation of food volume using circular referentsin dietary assessment饮食评估中食品体积的估计使用循环参照物的影像基础Quality classification of cooked, sliced turkey hams using NIR hyperspectral imaging system利用近红外高光谱影像系统对熟火鸡火腿切片的品质分级Implication of water activity and glass transition on the mechanicaland optical properties of freeze-dried apple and banana slices水活性和玻璃转化在冷冻干燥苹果和香蕉切片的力学光学性能的含义Inactivation of Saccharomyces cerevisiae in pineapple, grape and cranberry juices under pulsed and continuous thermo-sonication treatments酿酒酵母在菠萝,葡萄和蔓越橘汁脉冲和连续热声波降解法处理下的失活Investigating the performance of thermo nebulisation fungicide fogging system for loaded fruit storage room using CFD model利用流体力学模型计算热雾化杀菌剂雾化系统对已装水果储藏室性能的研究An Exploration of Why People Participate in Second Life Social Support Groups关于人们参加第二人生社会扶持组织原因的探索Kinetics of quality changes of pumpkin (Curcurbita maxima L.) stored under isothermal and non-isothermal frozen conditions南瓜储藏在等温和非等温冷冻条件下动力学性能的变化Kinetics studies during NaCl and KCl pork meat brining猪肉盐浸处理中氯化钠和氯化钾的动力学研究Linear and non-linear viscoelastic behaviors of crosslinked tapioca starch/polysaccharide systems交联木薯淀粉/多糖系统的线性和非线性粘弹性行为Monitoring changes in feta cheese during brining by magnetic resonanceimaging and NMR relaxometry在浸盐作用期间利用磁共振影像和核磁共振弛豫时间监测羊奶酪的变化Mathematical model of pork slice drying using superheated steam利用过热蒸汽干燥猪肉切片的数学模型Mathematical modeling of intermittent and convective drying of rice and coffee using the reaction engineering approach (REA)利用反作用工程方法间歇性和对流干燥大米,咖啡的数学建模Mathematical modeling of swelling in high moisture whey protein gels膨胀高水分乳清蛋白凝胶的数学建模Mathematical modeling of the heat and mass transfer in a stationary potato sphere impinged by a single round liquid jet in a hydro fluidization system利用单轮液体喷射在水电流态化系统在高温和质量传递在静止土豆表面撞击的数学建模An approach for the enhancement of the mechanical properties and film coating efficiency of shellac by the formation of composite films based on shellac and gelatin利用基于虫胶和明胶复合薄膜形成对虫胶的镀膜效率和机械性能提高的方法Mechanical relaxation times as indicators of stickiness in skimmilk–maltodextrin solids systems机械力松弛时间作为在粘性表层物牛奶麦芽糖糊精固体系统的指标Effect of composition on the mechanical response of agglomeratesof infant formulae初期公式的附聚物的机械回应成分的影响Combination of optical and non-destructive mechanical techniquesfor the measurement of maturity in peach光学和无损机械技术组合对桃子成熟的测量Expansion mechanism of extruded foams supplemented with wheat bran 增补挤压泡沫体伴随麦麸的膨胀原理Mechanistic model of in vitro salt release from model dairy gels based on standardized breakdown test simulating mastication乳品凝胶基于模拟粉碎稳定性试验标准在使观众盐释放的机械模型Mechanistic model to couple oxygen transfer with ascorbic acid oxidation kinetics in model solid food在固体食品模型中机械模型对结合氧运输随着抗坏血酸氧化的动力学Effect of sugar, citric acid and egg white type on the microstructuraland mechanical properties of meringues调和蛋白的糖,柠檬酸和蛋白类型在微观结构和机械性能的影响Microstructure and mechanical properties of soy protein/agar blend films: Effect of composition and processing methods大豆蛋白和琼脂膜混合的微观结构和机械性能:成分和处理方法的影响Coffea arabica beans microstructural changes induced by roasting: AnX-ray microtomographic investigation利用烘烤引诱咖啡豆微观结构的变化:一种X射线微层析调查The impact of microwave heating of infant formula model on neo-formed contaminant formation, nutrient degradation and spore destruction初级理论模型在新成立的污染物形成的微波加热的影响:营养退化和孢子退化Modeling and experimental validation of mass transfer from carbonated beverages in polyethylene terephthalate bottles从碳酸饮料在聚对苯二甲酸乙二醇酯瓶子中质量传递的实验验证和建模Modeling microbial kinetics as a function of temperature: Evaluationof dynamic experiments to identify the growth/inactivation interface根据温度对微生物动力学建模:动态实验的评估来鉴定增长/失活的分界面Modeling rehydration of porous food materials: I. Determinationof characteristic curve from water sorption isotherms多孔渗水食品材料的再水化建模:1,水等温吸附线中特性曲线的测定Modeling rehydration of porous food materials: II. The dual porosity approach多孔渗水食品材料的再水化建模:2,双重多孔性方法Modeling the effects of initial nitrogen content and temperatureon fermentation kinetics of hard cider初始含氮量和温度在苹果酒的发酵动力学的建模作用Modelling flow behaviour of dairy foams through a nozzle乳品泡沫通过喷嘴的建模流动状况Modelling of coupled heat and mass transfer during a contact baking process在联系烘烤进程期间耦合高温和质量传递的建模Monitoring and grading of tea by computer vision – A review利用计算机视觉对茶叶监测和分级-一个评审Monitoring of ATP and viable cells on meat surface by UV–Vis reflectance spectrum analysis利用紫外-可见反射比光谱分析对肉表面ATP和活细胞的监测Monitoring the dynamic density of dough during fermentation using digital imaging method利用数字影像方法在发酵期间对生面团的动态密度监测Microwave puffing: Determination of optimal conditions using a coupled multiphase porous media – Large deformation model微波膨化:利用一种耦合多相多孔介质对最适条件的测定-大型变形模型Red to far-red multispectral fluorescence image fusion for detection offecal contamination on apples利用红色对远红外多谱线的荧光影像融合对苹果排泄污染物的检测Artificial neural network model for prediction of cold spot temperature in retort sterilization of starch-based foods人工神经网络模型对淀粉性食物的蒸煮杀菌的冷点温度的预测Non-destructive analysis of anthocyanins in cherries by means of Lambert–Beer and multivariate regression based on spectroscopy and scatter correction using time-resolved analysis利用Lambert–Beer和多元回归基于光谱学和散射修正使用时间分辨分析对樱桃花青素的无损检测分析Non-destructive internal quality assessment of ‘‘Hayward’’ kiwifruitby waveguide spectroscopy利用波导光谱学对“Hayward”猕猴桃的内部品质无损检测Non-destructive maturity classification of mango based on physical, mechanical and optical properties基于物理,机械和光学特性对芒果成熟等级的无损检测Non-destructive prediction of hardening pericarp disorder in intact mangosteen by near infrared transmittance spectroscopy利用近红外线透射比光谱学对完整的山竹果无序表皮樱花的无损检测Efficacy of non-thermal technologies and sanitizer solutions on microbial load reduction and quality retention of strawberries非热能技术和食品防腐剂解决方案对草莓的微生物负荷减低和质量保持的功效Numerical modeling of heat and mass transfer during coffee roasting process咖啡豆烘烤进程的高温和质量传递数值模拟Accelerated inactivation of Geobacillus stearothermophilus spores by ohmic heating利用欧姆加热对芽孢杆菌的加速钝化Optimisation of total phenolic acids extraction from mandarin peels using microwave energy: The importance of the Maillard reaction利用微波能量从柑橘果皮对酚酸萃取的优化:美拉德反应的重要性Effect of guar gum content on some physical and nutritional properties of extruded products瓜尔豆胶在挤压产品的一些物理和营养特性的作用Physical properties of acerola and blueberry pulps金虎尾和蓝莓果肉的物理特性Physico-chemical characterization of chitosan-based edible films incorporating bioactive compounds of different molecular weight不同分子量的壳聚糖基可食用薄膜合并生物活性的化合物的理化特性Predicting cleaning time of ventilation duct systems in the food industry 通风管系统在食品工业的清洗时间预测Prediction of beef quality attributes using VIS/NIR hyperspectral scattering imaging technique利用可见/近红外高光谱散射影像技术队牛肉质量特性的预测Prediction of colloidal stability in white wines using infrared spectroscopy利用红外线光谱学对白葡萄酒胶体稳定性的预测Prediction of dry mass glass transition temperature and the spray drying behaviour of a concentrate using a desorption method利用解析方法对浓缩的干质量玻璃化温度和喷雾干燥状况的预测Production, recovery and applications of xanthan gum by Xanthomonas campestris利用白菜黄单胞菌对黄原胶的生产,恢复和应用Pulsed electric field assisted aqueous extraction of colorants from red beet电场脉冲协助红甜菜中色素的萃取Investigation of Raman chemical imaging for detection of lycopene changes in tomatoes during postharvest ripening利用拉曼化学成像在采收后成熟期间对番茄红素变化的检测的调查研究Real-time modeling of milk coagulation using in-line near infrared spectroscopy利用管线式近红外光谱学对牛奶凝结的即时性建模Removal of residual pesticide, fenitrothion, in vegetables by using ozone microbubbles generated by different methods用不同方法利用臭氧微气泡的产生对蔬菜杀虫剂(杀螟松)残渣的去除Effect of temperature on dynamic and steady-state shear rheological properties of siriguela (Spondias purpurea L.) pulp温度对松果菊果肉的动态和稳态切变流变学的影响Rheological behavior and stability of D-limonene emulsions made by a novel hydrocolloid (Angum gum) compared with Arabic gum由一种相比阿拉伯树胶的新水状胶体(Angum胶)制成的D-柠檬烯乳胶的流变特性和稳定性Modeling and estimation of rheological properties of food productsfor manufacturing simulations食品的流变特性对于制造模型的建模和评估Rheological, textural and spectral characteristics of sorbitol substituted mango jam山梨醇替代芒果果酱的流变的,组织的和光谱特性Rheology and microstructure of myofibrillar protein–plant lipid composite gels: Effect of emulsion droplet size and membrane type肌原纤维蛋白-植物油脂附和凝胶剂的流变学特性和微观结构:乳滴尺寸和薄膜类型的影响Rheometric non-isothermal gelatinization kinetics of mung bean starchslurry: Effect of salt and sugar – Part 1绿豆淀粉泥浆的流变测定非等温凝胶化动力学:盐和糖的作用-第一部分Scale-up unit of a unique moderately high pressure unit to enhance microbial inactivation唯一适度高压单元的增大单元来提高微生物失活Particle surface moisture content estimation using population balance modeling in fluidised bed agglomeration利用平衡建模的数量对使底座结块液化微粒表面水分含量的估测Shelf life prediction of aluminum foil laminated polyethylene packed vacuum dried coconut milk powder铝箔聚乙烯分层包装真空干燥椰子汁粉保质期的预测Effect of modified atmosphere and active packaging on the shelf-lifeof fresh bluefin tuna fillets改良环境和有效包装在新鲜金枪鱼切片保质期的影响Shortwave infrared hyperspectral imaging for detecting sour skin (Burkholderia cepacia)-infected onions短波红外线高光谱影像对被感染洋葱皮发酵的测定Wavelength selection in vis/NIR spectra for detection of bruises on apples by ROC analysis利用ROC分析用可见/近红外光谱对苹果损伤测定波长的选择Maltodextrin/pectin microparticles by spray drying as carrier fornutraceutical extracts喷雾干燥利用麦芽糖糊精/果胶微粒作为载体对保健品提取Structural properties of freeze-dried rice经过冷冻干燥大米的结构特性Study of contact angle, wettability and water vapor permeability in carboxymethylcellulose (CMC) based film with murta leaves(Ugni molinae Turcz) extract基于murta叶片薄膜萃取羧甲基纤维素接触角,湿润度和水蒸气渗透性的研究Granularity and its importance for traceability in a farmed salmon supply chain间隔尺寸以及其重要性对于养殖鲑鱼供给链的可追溯性Texture prediction during deep frying: A mechanistic approach油炸期间的质地预测:一种机械型工作设计方法The influence of vacuum impregnation on the fortification of apple parenchyma with quercetin derivatives in combination with pore structures X-ray analysis苹果软细胞组织附和橡黄素衍生物与X-射线孔隙结构分析结合的真空浸渍在营养强化上的影响The potential of electrospraying for hydrophobic film coating on foods 电喷镀对于在食品疏水性薄膜敷层的可能性The use of biodosimetry to measure the UV-C dose delivered to a sphere,and implications for the commercial treatment of fruit利用生物计量测定法测定紫外-C线剂量传递到球面,对于水果商业化处理的影响Corrigendum to ‘‘Theoretical and experimental analyses of drop deformation and break-up in a scale model of a high-pressure homogenizer’’ [Journal of Food Engineering 103/1 (2010) 21–28]勘误表:“高压均质器的液滴变形和终止缩尺模型的理论和实验分析”[食品工程杂志103/1(2010)21-28]Development of a two-band spectral imaging system for real-time citrus canker detection双频段光谱影像对于即时性检测柑橘溃疡的发展Shape determination of horticultural produce using two-dimensional computer vision – A review利用二维计算机影像对园艺产品形状的检测-一份评审Comparative study of high intensity ultrasound effects on foodproteins functionality高强度超声波作用在食物蛋白功能的对比性研究Uncertainty and sensitivity analysis: Mathematical model of coupled heat and mass transfer for a contact baking process不确定性和灵敏度分析:耦合高温和质量传递对于联系烘烤进程的数学模型Variable selection in visible and near-infrared spectra: Application toon-line determination of sugar content in pears可见和近红外光谱的可变性选择:应用于梨含糖量的即时检测Application of visible and near infrared spectroscopy for rapidand non-invasive quantification of common adulterants in Spirulina powder可见和近红外光谱对于螺旋藻粉共同掺杂物的快速以及非侵入性定量的应用Classification of longan fruit bruising using visible spectroscopy利用可见光谱学对桂圆损伤的分类Water diffusion and enzyme activities during malting of barley grains: A relationship assessment在大麦谷粒的麦粒发芽期间水扩散和酶活性:一个相关性评估Water transport properties of artificial cell walls人造细胞壁的水运输性能Weight loss of frozen bread dough under isothermal and fluctuating temperature storage conditions冷冻面包面团在等温和变动温度储藏条件下的质量损失Automated fish bone detection using X-ray imaging利用X-射线影像对鱼骨的自动化检测X-ray microtomography to study the microstructure of mayonnaiseX-射线显微断层显像对蛋黄酱微观结构的研究Influence of yeast and frozen storage on rheological, structural andmicrobial quality of frozen sweet dough酵母和冷冻储藏对冷冻甜面团的流变性,结构和微生物质量的影响Yield improvement in progressive freeze-concentration by partial melting of ice通过冷冻食品局部融化利用逐步冷冻浓缩提高产量。
可变式喷嘴涡轮增压器(VNT)可变区域涡轮喷嘴 Variable Area Turbine Nozzle,VATN可变涡轮截面 Variable Turbine Geometry,VTG可变涡轮几何增压器 Variable Geometry Turbo,VGT可变配气相位 Variable Vane Turbine,VVT内燃机 internal combustion engine入口 inlet出口 outlet柴油机diesel气缸cylinder叶轮、推动器 impeller内部冷却器Intercooler/charge air cooler/CAC节流阀,节流圈;油门;风门throttle发动机规格 engine specification发动机排量 displacement增压器规格 turbocharger specification涡轮安装角度 assembly angle of turbine housing压气机安装角度 assembly angle of compressor housing外形图 general view drawing截面图 section drawing for clearanceW/G放气阀调压要领图 W/G pressure adjustment instruction 压气机性能线图 compressor master performance涡轮机性能线图 turbine master performance设计计划书编号 DPS number阀 valve阀安装板 valve support垫圈 washer执行器总成 actuator assembly执行器 actuator执行器支架 actuator bracket连接板 link plateE型卡环 E-type retaining ringG型卡箍分总成 G-coupling assembly防烧结剂 bolt lubricant密封剂 sealing material脉冲计测要领 pulsation measurement轴承挡环压入要领 press fitting of bearing spacerCR型挡环压入要领 press fitting of CR retainerT侧止推轴承压入要领 press fitting of T/side T/B粘结剂涂敷要领 application adhesive密封胶涂敷要领 application gasket压气机叶轮压入要领 press fit compressor wheel高速动平衡要领 HSB procedureG型卡箍安装要领 G-coupling installation防尘帽(C/H入口)dustproof cap (C/h inlet)防尘帽(C/H 出口)dustproof cap (c/H outlet)防尘帽(电子阀)dustproof cap (two electric valve)防尘帽(出油口和水口)dustproof cap (oil outlet and water let) 防尘帽(入油口)dustproof cap (oil inlet)排气歧管exhaust manifold专利申请中Patent pending合金alloy系数coefficient隔套、隔板、垫片:spacer挡环:retainer液压:hydraulic抗氧化性:anti-oxidation氧化降低方法:oxidation reduction measurement氧化物:Oxide热疲劳:Thermo fatigue热裂解: thermal cracking抗变形:anti-deformation大气压:Atmospheric air pressure机器,设备:apparatus应变范围:strain rangeSO2: sulfurdioxide硬化:hardening热处理:heat processing数控机床:numerically-controlled machine tool车床:machine tool万能光谱分析:spectrum analysis镜像:mirror image离职率:dimission rate空气动力学:aerodynamics热力分析:thermodynamic analysis博格瓦纳:BorgWarner霍尼韦尔:Honeywell双涡轮:twin turbocharger收缩率:shrinkage砂浆:凝固:工装样件:OTS批号:batch托盘:pattet/trayPO/TO FIT for prototypeFixture design:Fixture manufacturing:Prototype building and delivery:2D&3D drawing freeze for prototype:OTS parts building and delivery(BS2.1):PPAP trial run:PSW sign off:FMEA:失效模式及其效果分析MSA:测量系统分析SPC:统计过程控制技术规范:technical specificationPPAP:生产件批准程序APQP&CP:产品质量先期策划与控制体系QPN:新零件先期质量策划FORMULA-Q:供应商质量评定量产:series production样件试制:trial sampleCr: 铬chromium [`kromIəm; ˋkroumiəm]W:钨 wolf.ram [`wJlfrəm; ˋwulfrəm]钨 (tungsten ) Ni:镍 nickelNb:铌 niobium [naI`obIəm; naiˋoubiəm]OTS: off-tooling sample 工装样件倒角:chamfer直径:diameter半径:Semidiameter孔中心距:hole center distance孔直径:hole diameter导气罩:air scroop间隙:clearance缸盖:cylinder head螺纹:thread参数:parameter进度表:time table工位器具:auxilliary tool设计认可:design freeze初始样件(BMG):initial sample首批样件:first sample执行器螺栓:lens head screw叉形接头总成:fork head assembly叉形接头:fork head连接销:link pin连接板:link plate三座标检测设备 3D measurement圆度检测设备 Roundness measurement粗糙度检测设备 Roughness measurement轮廓度检测设备 Contour measurement气动量仪检测设备 Pneumatic micrometer孔隙度检测设备 Porosity inspection machine硬度检测设备 Hardness inspection machine抗拉试验设备 Strength inspection machine材料分析仪 Material analysis machine螺纹:thread纵置化模块:transverse kitO型环:o ring固定螺栓:fixing screw机械性能:mechanical property模流分析:magmasoft simulation(铸造)试块:cast test bar布氏硬度:Brinell hardness testing裂纹测试:crack testing声波测试:sonic testing磁粉探伤:magnetic testing热处理:heat treat工序:step of process壁厚:wall thickness缩松检测:porosity specification内圆角规范:fillet specification转角半径规范:corner radii specification拔模斜度规范:draft angle specification粗糙度:roughness分型线上面要求的最大毛边:max allowed flash on parting lines 基准:datum铸件定位点:casting location/locating point螺母:nut磨损:wear破损:damage变形:distortion落砂磕碰:shake out抛丸:shot blaster剪切:clipping研磨:grinding防磨垫:prevent wear pad冷铁:chill热芯还是冷芯:shell core or cold core芯撑:chaplet偏差(两轴曲折):deflection活块:loose piece砂芯粘贴:core gluing粘芯夹具:gluing fixture自动下芯:auto core setting tool涂料(浸砂芯):wash涡轮砂芯:volute core废气阀:waste gate防错系统:poke yoke流路(补缩通道):feed path冷冒口:cold riser定位面:locating surface分模线:parting line fin飞边:fillet表面异常:surface irregularity 端:extremity加工夹具:machining fixture氧传感器:oxygen sensor空气传感器:air sensor凸台/脐子:boss指状铣刀:finger cutter锐边:sharp edge六点定位:six point orientation 铸造基准:casting datum丝锥刀具:tap cutter螺纹铣刀:thread miller cutter垂直正交:perpedicularity造型浇铸重量:mold pour weight 内表面轮廓:inside profile波纹度:waviness轮廓度:profile(degree)夹具:fixture去除毛刺:debur钻头:thread drill同心度:concentricity退火:anneal拔模:draft倒拔模:inverse draft脱模:demoulding减掉:subtract应力:stress铸造学专业英语词汇(30)直立浇铸vertical pouring直立心型端承,直立砂心头vertical coreprint直立旋板心轴upright spindle直立造模vertical molding直立造模法mold on end直立铸模vertical mold直立铸造vertical casting直落砂心drop core直木纹edge grain直提砂心头tail print直通干燥炉through feed drying furnace直显照片(金相) direct print直压式合机direct pressure closing植物油vegetable oil指形进模口finger gate酯系硬化法ester-process制震能damping capacity蛭石vermiculite置冲法pour-over method置冲法transfer method置模箱set-off box滞流(铸疵) mistrun制程退火process annealing制模型铣床pattern milling machine制图,起模drawing制造熔接production welding制造冶金学process metallurgy质量效应,厚薄效应mass effect致密度consistency中间处理intermediate treatment中间检查intermediate inspection中间金属intermediate metal中间砂箱,中间模箱cheek box ,cheek flask中间砂箱,中间模箱raising middle flask中磷生铁(P0.4-0.75%) medium phosphorus pig iron中模,中间砂箱,中间模箱cheek中碳钢medium carbon steel中途添焦spreader charge of coke中线收缩centerline shrinkage中心板,旋刮板心轴承座center plate中心规centergage中性耐火材料neutral refractory materials中性熔渣neutral slag中性砖neutral brick中周波感应电炉intermediate frequency furnace 锺,锺形塞进器bell锺青铜bell bronze重搭overlap重捣砂hard ramming重金属铸件heavy-metal castings重晶石heavy spar重力分离器gravitational separator重力滚子输送机(倾斜式) gravity roller conveyor 重力偏析gravity segregation重力输送机gravity conveyor重力压铸法gravity die casting重力铸造法gravity casting重燃油heavy fuel oil重熔remelting重熔工场secondary smelter重印法(造模) print back重油heavy oil重整石英砂replenishment quartz sand重铸recasting轴shaft轴承合金bearing metal皱痕面(铸疵) creasy surface皱皮(铸疵) orange peel皱皮(铸疵) surface folding珠,粒,击,射注过程(压铸) shot珠击处理shot peening珠击机shot peening machine珠粒喷击清理shot blasting珠泡bead竹叶状液面花纹bamboo leaves pattern主成分,基本金属primary coil主模master mold主心型,主砂心body core煮材干燥法boiling seasoning助流剂fluidizer助黏剂,膨胀性粘结剂swelling binder注入槽(压铸) pouring shot注射器injector柱column柱pillar柱塞,塞罩plunger柱塞,塞罩post柱状结晶columnar crystal柱状组织columnar structurew 仓壁冲击振动器impact vibration on bin wall 贮砂桶匣(砂心机用) magazine铸包camlachie cramp铸壁wall铸壁鹌鹑wall thickness铸补burning on铸补tinkering铸成率casting yield铸成试片cast-to-shape specimen铸尺contraction rule铸疵casting defect铸疵defect test铸疵,铸造缺陷foundry defects铸疵试验defect test铸锭ingot铸锭底砖spider铸锭浇口砖king brick铸锭模ingot case铸锭状态as-ingot铸钢cast steel铸钢造模料steel foundry molding compound 铸工caster铸工founder铸合金ferro-alloy铸弧pouring arc铸件castings铸件表面casting surface铸件表皮casting skin铸件飞边,铸件毛边casting fin铸件内包物cast-in insert铸件清理,最后加工finishing铸件清理图dressing shop铸件修整finishing of castings铸件应力casting stress铸焦foundry coke铸坑casting pit铸坑foundry pit铸裂(铸疵) casting crack铸瘤rising铸漏bleed铸漏break out铸漏run-out铸漏件bleeder铸模mold,mould铸模布置mold layout铸模除除掉(压铸) impression block铸模龟裂,脉状痕(铸疵) veining铸模夹具mold clamp铸模输送机mold conveyer铸模块合mold assembly铸耙rake铸皮skin铸皮孔skin holes铸砂casting sand铸砂处理foundry sand preparation铸砂处理preparation of sand铸砂处理工场foundry sand preparation plant铸砂控制sand control铸砂控制设备sand control equipment铸砂流动性flowability of sand铸砂流动性foundry sand铸砂膨(铸疵) sand drier铸砂强度试验strength test of sand铸砂强化strengthen the sand铸砂烧结(铸疵) sand burning铸砂烧贴(铸疵) sintering point铸砂油casting oil铸生铁机pig machine铸损foundry losses铸损,不良铸件waster,foundry losses铸铁cast iron铸铁工场iron foundry铸铁管cast iron pipe铸铁组织图cast iron diagram铸铁组织图structural diagram of cast iron铸造founding铸造,铸件casting铸造场smith shop机械英语专用词汇1,2一、入水:gate进入位:gate location 水口形式:gate type大水口:edge gate 细水口:pin-point gate水口大小:gate size 转水口:switching runner/gate唧嘴口径:sprue diameter二、流道: runner热流道:hot runner, hot manifold 热嘴冷流道: hot sprue/cold runner唧嘴直流: direct sprue gate 圆形流道:round(full/half runner流道电脑分析:mold flow analysis 流道平衡:runner balance热嘴:hot sprue 热流道板:hot manifold发热管:cartridge heater 探针: thermocouples插头:connector plug 插座:connector socket 密封/封料:seal三、运水:water line喉塞:line plug 喉管:tube塑胶管:plastic tube 快速接头:jiffy quick connector plug/sucker四、模具零件:mold components三板模:3-plate mold 二板模:2-plate mold边钉/导边:leader pin/guide pin 边司/导套:bushing/guide bushing中托司:shoulder guide bushing 中托边L:guide pin顶针板:ejector retainner plate 托板:support plate螺丝:screw 管钉:dowel pin 开模槽:ply bar scot内模管位:core/cavity inter-lock 顶针:ejector pin司筒:ejector sleeve 司筒针:ejector pin推板:stripper plate 缩呵:movable core,return core core puller扣机(尼龙拉勾):nylon latch lock 斜顶:lifter模胚(架):mold base 上内模:cavity insert下内模:core insert 行位(滑块):slide镶件:insert 压座/斜鸡:wedge 耐磨板/油板:wedge wear plate 压条:plate 撑头: support pillar 唧嘴:sprue bushing挡板:stop plate 定位圈:locating ring 锁扣:latch扣鸡:parting lock set 推杆:push bar 栓打螺丝:S.H.S.B顶板:eracuretun 活动臂:lever arm 分流锥:spure sperader水口司:bush 垃圾钉:stop pin 隔片:baffle弹弓柱:spring rod 弹弓:die spring 中托司:ejector guide bush中托边:ejector guide pin 镶针:pin 销子:dowel pin波子弹弓:ball catch 喉塞: pipe plug 锁模块:lock plate斜顶:angle from pin 斜顶杆:angle ejector rod尼龙拉勾:parting locks 活动臂:lever arm复位键、提前回杆:early return bar 气阀:valves斜导边:angle pin 术语:terms承压平面平衡:parting surface support balance模排气:parting line venting回针碰料位:return pin and cavity interference模总高超出啤机规格:mold base shut hight顶针碰运水:water line interferes withejector pin料位出上/下模:part from cavith (core) side模胚原身出料位:cavity direct cut on A-plate, core direct cut on B-plate. 不准用镶件:Do not use (core/cavity) insert用铍铜做镶件:use beryllium copper insert初步(正式)模图设计:preliinary (final) mold design反呵:reverse core 弹弓压缩量:spring compressed length稳定性好:good stability, stable 强度不够:insufficient rigidity均匀冷却:even cooling 扣模:sticking热膨胀:thermo expansion 公差:tolorance 铜公(电极):copper electrode 常用塑料英语缩略语[分享]英文简称英文全称中文全称ABA Acrylonitrile-butadiene-acrylate 丙烯腈/丁二烯/丙烯酸酯共聚物ABS Acrylonitrile-butadiene-styrene 丙烯腈/丁二烯/苯乙烯共聚物AES Acrylonitrile-ethylene-styrene 丙烯腈/乙烯/苯乙烯共聚物AMMA Acrylonitrile/methyl Methacrylate 丙烯腈/甲基丙烯酸甲酯共聚物ARP Aromatic polyester 聚芳香酯AS Acrylonitrile-styrene resin 丙烯腈-苯乙烯树脂ASA Acrylonitrile-styrene-acrylate 丙烯腈/苯乙烯/丙烯酸酯共聚物CA Cellulose acetate 醋酸纤维塑料CAB Cellulose acetate butyrate 醋酸-丁酸纤维素塑料CAP Cellulose acetate propionate 醋酸-丙酸纤维素CE Cellulose plastics, general 通用纤维素塑料CF Cresol-formaldehyde 甲酚-甲醛树脂CMC Carboxymethyl cellulose 羧甲基纤维素CN Cellulose nitrate 硝酸纤维素CP Cellulose propionate 丙酸纤维素CPE Chlorinated polyethylene 氯化聚乙烯CPVC Chlorinated poly(vinyl chloride) 氯化聚氯乙烯CS Casein 酪蛋白CTA Cellulose triacetate 三醋酸纤维素EC Ethyl cellulose 乙烷纤维素EMA Ethylene/methacrylic acid 乙烯/甲基丙烯酸共聚物EP Epoxy, epoxide 环氧树脂EPD Ethylene-propylene-diene 乙烯-丙烯-二烯三元共聚物EPM Ethylene-propylene polymer 乙烯-丙烯共聚物EPS Expanded polystyrene 发泡聚苯乙烯ETFE Ethylene-tetrafluoroethylene 乙烯-四氟乙烯共聚物EVA Ethylene/vinyl acetate 乙烯-醋酸乙烯共聚物EVAL Ethylene-vinyl alcohol 乙烯-乙烯醇共聚物FEP Perfluoro(ethylene-propylene) 全氟(乙烯-丙烯)塑料FF Furan formaldehyde 呋喃甲醛HDPE High-density polyethylene plastics 高密度聚乙烯塑料HIPS High impact polystyrene 高冲聚苯乙烯IPS Impact-resistant polystyrene 耐冲击聚苯乙烯LCP Liquid crystal polymer 液晶聚合物LDPE Low-density polyethylene plastics 低密度聚乙烯塑料LLDPE Linear low-density polyethylene 线性低密聚乙烯LMDPE Linear medium-density polyethylene 线性中密聚乙烯零件英语零件类punch冲头 insert入块(嵌入件) deburring punch压毛边冲子groove punch压线冲子 stamped punch字模冲子round punch圆冲子 special shape punch异形冲子bending block折刀roller滚轴 baffle plate挡块located block定位块 supporting block for location 定位支承块air cushion plate气垫板air-cushion eject-rod气垫顶杆trimming punch切边冲子 stiffening rib punch = stinger 加强筋冲子ribbon punch压筋冲子 reel-stretch punch卷圆压平冲子guide plate定位板 sliding block滑块sliding dowel block滑块固定块active plate活动板 lower sliding plate下滑块板upper holder block上压块upper mid plate上中间板spring box弹簧箱 spring-box eject-rod弹簧箱顶杆spring-box eject-plate弹簧箱顶板bushing bolck衬套cover plate盖板 guide pad导料块塑件&模具相关英文compre sion molding压缩成型 flash mold溢流式模具plsitive mold挤压式模具 split mold分割式模具cavity型控母模core模心公模 taper锥拔leather cloak仿皮革 shiver 饰纹 flow mark流痕welding mark溶合痕 post screw insert螺纹套筒埋值 self tapping screw自攻螺丝striper plate脱料板 piston活塞cylinder汽缸套chip细碎物 handle mold手持式模具移转成型用模具encapsulation molding低压封装成型射出成型用模具 two plate两极式(模具)well type蓄料井insulated runner绝缘浇道方式 hot runner热浇道runner plat浇道模块 valve gate阀门浇口band heater环带状的电热器 spindle阀针spear head刨尖头 slag well冷料井cold slag冷料渣 air vent排气道welding line熔合痕 eject pin顶出针 knock pin顶出销return pin回位销反顶针 sleave套筒 stripper plate脱料板insert core放置入子 runner stripper plate浇道脱料板guide pin导销 eject rod (bar)(成型机)顶业捧subzero深冷处理 three plate三极式模具runner system浇道系统 stress crack应力电裂orientation定向 sprue gate射料浇口,直浇口nozzle射嘴 sprue lock pin料头钩销(拉料杆)slag well冷料井 side gate侧浇口edge gate侧缘浇口 tab gate搭接浇口film gate薄膜浇口flash gate闸门浇口 slit gate缝隙浇口fan gate扇形浇口 dish gate因盘形浇口 diaphragm gate隔膜浇口 ring gate环形浇口subarine gate潜入式浇口 tunnel gate隧道式浇口pin gate针点浇口Runner less无浇道 (sprue less)无射料管方式long nozzle延长喷嘴方式 sprue浇口;溶渣冲压英语stamping, press冲压 punch press, dieing out press冲床uncoiler & strainghtener整平机feeder送料机rack, shelf, stack料架 cylinder油缸robot机械手 taker取料机 conveyer belt输送带transmission rack输送架 top stop上死点bottom stop下死点one stroke一行程 inch寸动to continue, cont.连动to grip(material)吸料location lump, locating piece, block stop 定位块reset复位smoothly顺利dent压痕 scratch刮伤 deformation变形filings铁削 to draw holes抽孔 inquiry, search for查寻approval examine and verify审核 processing, to process加工registration登记 registration card登记卡to control管制to put forward and hand in提报safe stock安全库存 acceptance = receive验收to notice通知 application form for purchase请购单consume, consumption消耗abrasion磨损 reverse angle = chamfer倒角character die字模 to collect, to gather收集failure, trouble故障 to take apart a die卸下模具to load a die装上模具to tight a bolt拧紧螺栓to looser a bolt拧松螺栓 to move away a die plate移走模板easily damaged parts易损件standard parts标准件breaking.(be)broken,(be)cracked 断裂 to lubricate润滑common vocabulary for die engineering模具工程常用词汇die 模具figure file, chart file图档cutting die, blanking die冲裁模progressive die, follow (-on)die 连续模compound die复合模 punched hole冲孔 panel board镶块 to cutedges=side cut=side scrap切边 to bending折弯to pull, to stretch拉伸Line streching, line pulling线拉伸 engraving, to engrave刻印 upsiding down edges翻边 to stake铆合designing, to design设计 design modification设计变化die block模块 folded block折弯块sliding block滑块 location pin定位销lifting pin顶料销die plate, front board模adding block垫块 stepping bar垫条upper die base上模座 lower die base下模座upper supporting blank上承板 upper padding plate blank上垫板spare dies模具备品spring 弹簧bolt螺栓机械英语专用词汇2Assembly line组装线Layout布置图 Conveyer流水线物料板Rivet table拉钉机Rivet gun拉钉枪Screw driver起子Electric screw driver电动起子 Pneumatic screw driver气动起子OOBA开箱检查fasten锁紧(螺丝) fixture 夹具(治具) pallet栈板barcode条码barcode scanner条码扫描器 fuse together熔合 fuse machine热熔机repair修理cosmetic inspect外观检查inner parts inspect内部检查thumb screw大头螺丝lbs. inch镑、英寸 EMI gasket导电条front plate前板 rear plate后板 chassis 基座bezel panel面板power button电源按键reset button重置键Hi-pot test of SPS高源高压测试sheet metal parts 冲件plastic parts塑胶件SOP制造作业程序material check list物料检查表work cell工作间电源电压接拉键carton纸箱sub-line支线left fork叉车common equipment常用设备 uncoiler and straightener整平机punching machine 冲床 robot机械手 hydraulic machine油压机| 刨床↔lathe车床planer |'plein miller铣床 grinder磨床driller??床 linear cutting线切割 electrical sparkle电火花welder电焊机 staker=reviting machine铆合机to move, to carry, to handle搬运be put in storage入库pack packing包装 to apply oil擦油to file burr 锉毛刺final inspection终检 to connect material接料to reverse material 翻料wet station沾湿台Tiana天那水cleaning cloth抹布to load material上料to unload material 卸料 to return material/stock to退料scraped |'skræpid|报废scrape ..v.刮;削deficient purchase来料不良manufacture procedure制程deficient manufacturing n|氧化scratch刮伤dents压痕defective upsiding↔procedure制程不良oxidation |' ksi'dei down抽芽不良 defective to staking铆合不良embedded lump镶块 feeding is not in place送料不到位stamping-missing漏冲production capacity生产力education and training教育与训练 proposal improvement提案改善spare parts=buffer备件 forklift叉车 trailer=long vehicle拖板车compound die合模die locker锁模器 pressure plate=plate pinch压板bolt螺栓 automatic screwdriver电动启子 thickness gauge厚薄规gauge(or jig)治具 power wire电源线 buzzle蜂鸣器 defective product label不良标签 identifying sheet list标示单screwdriver holder起子插座 pedal踩踏板 stopper阻挡器flow board流水板hydraulic handjack油压板车forklift叉车pallet栈板 glove(s)手套glove(s) with exposed fingers割手套thumb大拇指forefinger食指midfinger中指 ring finger无名指little finger小指 band-aid创可贴 iudustrial alcohol工业酒精alcohol container沾湿台 head of screwdriver起子头sweeper扫把 mop拖把 vaccum cleaner吸尘器rag 抹布garbage container灰箕 garbage can垃圾箱garbage bag垃圾袋 chain链条 jack升降机production line流水线chain链条槽 magnetizer加磁器 lamp holder灯架to mop the floor拖地 to clean the floor扫地 to clean a table擦桌子air pipe 气管 packaging tool打包机 packaging打包missing part漏件 wrong part错件 excessive defects过多的缺陷critical defect极严重缺陷 major defect主要缺陷minor defect次要缺陷 not up to standard不合规格dimension/size is a little bigger尺寸偏大(小) cosmetic defect外观不良slipped screwhead/slippery screw head螺丝滑头slipped screwhead/shippery screw thread滑手speckle斑点mildewed=moldy=mouldy发霉rust生锈deformation变形burr(金属)flash(塑件)毛边poor staking铆合不良excesssive gap间隙过大 grease/oil stains油污 inclusion杂质painting peel off脏污 shrinking/shrinkage缩水 mixed color杂色scratch划伤 poor processing 制程不良poor incoming part事件不良fold of pakaging belt打包带折皱painting make-up补漆 discoloration羿色water spots水渍polishing/surface processing表面处理exposed metal/bare metal金属裸露 lack of painting烤漆不到位 safety安全quality品质 delivery deadline交货期 cost成本engineering工程 die repair模修enterprise plan = enterprise expansion projects企划QC品管 die worker模工 production, to produce生产equipment设备 to start a press开机 stop/switch off a press关机classification整理 regulation整顿 cleanness清扫conservation清洁 culture教养qualified products, up-to-grade products良品defective products, not up-to-grade products不良品waste废料 board看板 feeder送料机 sliding rack滑料架defective product box不良品箱 die change 换模 to fix a die装模to take apart a die拆模 to repair a die修模 packing material包材basket蝴蝶竺 plastic basket胶筐isolating plate baffle plate; barricade隔板 carton box纸箱to pull and stretch拉深to put material in place, to cut material, to input落料to impose lines压线 to compress, compressing压缩character die字模 to feed, feeding送料 transportation运输(be)qualfied, up to grade合格 not up to grade, not qualified不合格material change, stock change材料变更 feature change 特性变更evaluation评估 prepare for, make preparations for 准备parameters参数 rotating speed, revolution转速manufacture management制造管理 abnormal handling异常处理production unit生产单位 lots of production生产批量steel plate钢板 roll material卷料manufacture procedure制程operation procedure作业流程 to revise, modify修订to switch over to, switch---to throw--over switching over切换engineering, project difficulty 工程瓶颈 stage die工程模automation自动化 to stake, staking, reviting铆合add lubricating oil加润滑油shut die架模shut height of a die架模高度analog-mode device类模器die lifter举模器argon welding氩焊。
混凝土细观力学研究进展及评述马怀发陈厚群黎保琨展,在细观层次上利用数值方法直接模拟混凝土试件或结构的裂缝扩展过程及破坏形态,直观地反映出试件的损伤破坏机理引起了广泛的注意。
近十几年来,基于混凝土的细观结构,人们提出了许多研究混凝土断裂过程的细观力学模型,最具典型的有格构模型(Latticemodel)、随机粒子模型(R跚domparticle啪del)‘掣MohamedAR【引等提出的细观模型、随机骨料模型(Randomaggllegatemodel)及唐春安等人心8’2引提出的随机力学特性模型等。
这些模型都假定混凝土是砂浆基质、骨料和两者之间的粘结带组成的三相复合材料,用细观层次上的简单本构关系来模拟复杂的宏观断裂过程。
另外,文献[30~32]根据混凝土材料特性与分形维数的相关关系,运用分形方法定量描述了混凝土的损伤演化行为。
4.1格构模型格构模型将连续介质在细观尺度上被离散成由弹性杆或梁单元连结而成的格构系统,如图2。
每个单元代表材料的一小部分(如岩石、混凝土的固体基质)。
网格一般为规则三角形或四边形,也可是随机形态的不规则网格。
单元采用简单的本构关系(如弹脆性本构关系)和破坏准则,并考虑骨料分(a)格构杼件网络(b)格构杆件属性布及各相力学特性分布的随机性。
计算时,图2格构模型在外载作用下对整体网格进行线弹性分析,计算出格构中各单元的局部应力,超过破坏阈值的单元将从系统中除去,单元的破坏为不可逆过程。
单元破坏后,荷载将重新分配,再次计算以得出下个破坏单元。
不断重复该计算过程,直至整个系统完全破坏,各单元的渐进破坏即可用于模拟材料的宏观破坏过程。
格构模型思想产生于50多年前,当时由于缺乏足够的数值计算能力,仅仅停留在理论上。
20世纪80年代后期,该模型被用于非均质材料的破坏过程模拟n8瑚’21’33。
6]’。
后来,schlangenE等人汹’21’”“3将格构模型应用于混凝土断裂破坏研究,模拟了混凝土及其它非均质材料所表现的典型破坏机理和开裂面的贯通过程。
石油工程专业英语单词Aabnormal pressure 异常高压absolute open flow potential 绝对敞喷流量absolute permeability 绝对渗透率acetic acids 乙酸acid-fracturing treatment 酸化压裂处理acidize 酸化acidizing 酸化additives 添加剂Alkali/Surfactant/Polymer(ASP) tertiary combination flooding 三元复合驱anhydrite 无水石膏annular space 环形空间appraisal well 估计井,评价井aquifer 含水层areal sweep efficiency 面积波及系数artificial lift methods 人工举升方法Bbeam pumps 游梁式抽油机bitumen 沥青blast joint 耐磨钻头block and tackle 滑轮组blowout preventes 防喷器blowout 井喷bone strength 胶结强度borehole 井筒,井眼bottomhole/wellhead pressure 井底/井口压力bottorm water 底水breakthrough 突破,穿透bubble point 泡点bubble point pressure 泡点压力Ccable tool drilling 顿钻钻井capillary action 毛细管作用carbonate reservoirs 碳酸盐储层casing hanger 套管悬挂器casing head 套管头casing collapse 套管损坏casing corrosion 套管腐蚀casing leak 套管漏失casing pressure 套管压力casing string 套管柱casing 套管casing-tubing configuration 套管组合casing-tubing configuration 油套管井身结构caustic flooding 碱水驱油cavings 坍塌cement additive 水泥浆添加剂cement job 固井作业cement plug 水泥塞cement slurry 水泥浆cementation 固井,胶结cementing practices 注水泥施工centralizer 扶正器chemical flooding 化学驱油chock 节流器choke 油嘴,阀门christmas tree 采油树combustion engines 内燃机compatibility 兼容性compatibility 兼容性,配伍性completion interval 完井层段compressibility 压缩系数compression coefficient 压缩系数compressive strength 抗压强度cone bit 牙轮钻头connate water 共生水,原生水continuous gas lift 连续气举core sample 岩心样品cost-per-day basis 每天成本基价cost-per-foot basis 每英尺成本基价crank 曲柄crown block 天车crude oil 原油cumulative production 累计产量Ddamage well/zone 污染井/带darcy 达西darcy‘s law 达西定律dead line 死绳dehydration 脱水deposit 沉积,贮存n,矿床,蕴藏量derrick 井架derrick 钻塔,井架development well 开发井development well 生产井dewpoint 露点diesel fuel 柴油discovery well 资料井displacement efficiency 驱油效率displacement efficiency 驱替效率displacement rate 驱替效率displacing fluid 驱替液displacing medium 驱替介质dissolved-gas drive reservoir溶解气驱油藏downhole assembly 井下装置downhole equipment 井下装置downhole 井底,井下downsroke 下行冲程drainage areas/radius 泄油面积/半径drill collar 钻铤drill collars 钻铤drill 钻井driller 司钻,钻工drilling floor 钻台drilling line 大绳drilling slot 井槽drilling contract 钻井合同drilling fluid 钻井液drilling location 井位drilling rate 钻速drillpipe 钻杆drillship 钻井船drillsite 井场drillstring 钻柱dry forward combustion 干式正向燃烧Eeffective displacement 有效驱替effective permeability 有效渗透率effective wellbore vadius 有效井筒半径electric submersible centrifugal pumps 电泵embrittlement 脆裂emulsion 乳化剂encroachment 水侵enhanced oil recover(EOR)提高采收率ethane 乙烷Ffault 断层fishing tool 打捞工具flow efficiency 完善系数flow regime 流动类型/方式flowing tubing pressure 井口流压flowing well 自喷井fluid loss agent 降滤失剂fluid loss control 防液体漏失foam flooding 泡沫驱油、foam-type drilling fluid 泡沫钻井液formation volume factor 地层体积系数formic acids 甲酸fractional flow 分相流动fracture acidizing 酸化压裂fracture fluid 压裂液fracture pressure 破裂压力fracture 裂缝,断裂free gas 游离气Ggas cap 气顶gas condensate reservoir 凝析气藏gas lift 气举gas-lift valve 气举阀gas-liquid ratio 气液比gas-oil ratio 汽油比gasoline 汽油gear reducer 齿轮减速器geothermal gradient 地温梯度gravity drainage 重力泄油gravity segregation 重力分离gum bed 地蜡gusher 自喷井,喷油井Hheavy oil 重油heterogeneous reservoir 非均质储层heterogeneous 非均质的high gravity 高API度,轻质的hole angle 井斜角horizontal well 水平井hreaded coupling 螺纹接口huff and puff 蒸汽吞吐hydraulic fracture 水力压裂hydrocarbon 碳氢化合物hydrogen sulfide 硫化氢hydrostatic head 静水压头hydrostatic pressure 静液压力Iindividual well 单井inhibitor 抑制剂initial completion 初次完井injection rate 注入速度/量interfacial tension 表面张力intermediate casing string 技术套管intermediate casing 中间套管intermittent gas lift 间歇气举Jjackknife derrick 折叠式井架jelly 胶状物,凝胶物joints 根数junction box 接线匣Kkelly 方钻杆kerosene 煤油kick 井涌kill corrosion 压力液kill line 压井管线kill the well 关井Llanding nipple 坐放短节leading edge 前缘leakoff rate 漏失速率load-bearing capacity 承重能力logger 测试仪器logging 测井lost circulation 漏失lost circulation additive 堵漏剂lubricant 润滑油Mmaking a trip 起下钻making a connection 接单根massive hydraulic fracturing 大型水力压裂material balance calculations 物质平衡方程matrix acidizing 基质酸化mechanical efficiency 机械效率methane 甲烷microbial enhanced oil recovery 微生物强化采油microemulsion flooding 微乳液驱油mobility rate 流度比mobility 流度,流动性mud pump 泥浆泵mud thinner 降粘剂mud 泥浆mud/section pit 泥浆池multipay reservoir 多油层油田Nnatural fissure 天然裂缝nature gas 天然气net thickness 有效厚度net thickness 有效厚度nogo nipple 不过端短节nozzle 喷油嘴numerical simulation 数值模拟Ooffset well 补偿井oil formation volume factor 原油地层体积系数oil saturation 残余油饱和度oil seeps 油苗oil spill 油漏open-hole completion 裸眼完井organic acids 有机酸overburden 地层表土overburden pressure 上覆岩层压力overload protection 过载保护Ppacker 封隔器pad fluid 前置液paraffin 石蜡,链烷烃paraffin base 石蜡基pay zone 生产层,产油层pay sand 产油层,生产层peak load 最大载荷,峰值负值penetration rate 进尺速度penetration rate 渗入速度,机械钻速percussion 顿钻perforating job 射孔作业performance velationship 动态关系permeability 渗透率permeability anisotropy 渗透率各向异性petroleum 石油petroleum engineer 石油工程师petroleum industry 石油工业petroleum jelly 石油膏phase diagram 相态图piston stroke 活塞冲程pitman 联杆泵plate tectonics 板块构造理论plunger lift 活塞气举polished rod 光杆polymer flooding 聚合物驱油pore volume 有限孔隙体积porosity 孔隙度porous medium 多孔介质porous rock 多孔岩石positive-displacement position 容积式驱替活塞power fluid 传动液preflush 前置液preflush fluid 前置液,冲洗液pressure build up test 压力恢复试井pressure differential 压差pressure drawdown 压降,压差pressure gradient 压力梯度primary recovery 一次开采primary cementing 固井,初次注水泥primary porosity 原生孔隙度prime mover 原动机produced fluid 产出液producing rate 开采速度producting formation 生产层production technology 采油技术production casing 生产套管production platform 采油平台production string 生产(油层)套管productivity 生产率productivity index 生产指数proposed well 资料井proppant 支撑剂pseudo-steady-state flow 拟稳定流动put back on production 恢复生产Rradial area 径向面积radical flow 径向流recoverable reserve 可采储量recovery rates 回采收率,开采速度relative permeability 相对渗透率remaining oil 剩余油remedial work 修井作业reservoir drive mechanism 油藏驱油机理reservoir heterogeneous 储层非均质性reservoir 储层,储集层,油层residual oil saturation 残余油饱和度resistivity curre 电阻率曲线reverse combustion 反向燃烧rig 钻机riser 隔水管rodless pumping system 无杆泵系统roller bit 牙轮钻头rotary drilling 旋转钻井rotary hose 水龙带rotary system 旋转钻井系统rotary table 转盘rotary table 转盘rotary 旋转钻井Ssafety valve 安全阀salinity 矿化度salinity 矿化度sand control 含沙量控制sand production 油井出砂sandstore 砂岩secondary recovery 二次开采secondary porosity 次生孔隙度seep 漏出,渗出n,(油气)苗seepage n,渗出,流出seismic interpretation 地震解释separator 分离器setting time 凝固时间shale 页岩,泥岩shear rate 剪贴速率shut-in well pressure 关井压力skin effect 表皮效应slotted liner 割裂衬管sloughing 坍塌性的slurry density 水泥浆密度slurry viscosity 水泥浆粘度sonic bond log 声波测井spontaneous potential(SP)自然电位stabilizer 稳定器standpipe 立管stands 立管static reservoir pressure 油层静压steam flooding 蒸汽驱油stimulation 增产措施stricking problem 卡钻stripper well 低产井stroke length 冲程长度stuffing box 填料盒submersible rig 坐底式钻井平台substructure 井架底座subsurfance unit 地下单位subsurfance pump 井下泵sucker rod 抽油杆sulfide embrittlement 硫化氢脆裂sulfur 硫磺superficial velocity 表观粘度surface casing 表层套管surface flow line 地面流动管线surface tesion 表面张力surface unit 抽油机,地面装置surfactant flooding 表面积活性剂驱油switchboard 配电盒swivel 旋转钻头Ttensile strength 抗拉强度thickening time 稠化时间tool pusher 钻井队长torque rating 扭矩测定transformer 变压器,转换器transient flow 瞬变流动tubing string 油管柱turbulent flow 紊流Uunswept zone 未波及区upstroke 上行冲程Vvalve 阀门,阀vertical flow 垂直流vertical sweep efficiency 纵向波及系数vertical well 垂直井vibrating screens 振动筛viscosity 粘度void space 孔隙volume factor 体积系数volumetic sweep efficiency 体积波及系数volumetric efficiency 容量效率vug 孔洞,溶洞Wwait on cement(WOC)侯水泥凝固water flood recovery 注水采油water flooding 水驱water injection 注水量water-oil ratio 油水比water-sensitive 水敏性的wax 石蜡well bore 井眼well completion 完井well deliverability equation 油井产能方程well intake pressure 井口注入压力well-killing fluid 压裂液wet combustion 湿式燃烧wettability 润湿性wildcat well 预探井wildcatter 勘探者withdrawal 产出,采出workover 油井维修汉译英原油 crude oil天然气 natural gas方钻杆 kelly钻杆 drillpipe泥浆泵 mud pump转盘 rotary table封隔器 packer旋转钻井 rotary drilling固井 cementing裸眼完井 openhole completion井口 well head扶正器 centralizer三次采油 tertiary recovery射孔 perforating油管 tubing油井流入动态 inflow performance relationship 井底流压 bottom hole flowing pressure采油指数 productivity index增产增注措施 stimulation近井地带 near-well bore region含水率 water cut最终采收率 ultimate recovery剩余油 remaining oil提高采收率 IOR水驱 water flooding原始地质储量 OOPI(original oil in place)流度比 mobility ratio有效渗透率 effective permeability孔隙体积 pore volume上冲程 upstroke下冲程 downstroke润湿性 wettability聚合物驱 polymer flooding11。
化工专业英语词汇reaction kinetics 反应动力学reactant 反应物purify 精制提纯recycle 循环回收unconverted reactant未转化的反应物chemical reactortransfer of heat,evaporation,crystallization结晶drying干燥screening筛选,浮选chemical reaction化学反应cracking of petroleum石油裂解catalyst催化剂,reaction zone反应区conservation of mass and energy能量与质量守衡定律technical advance 技术进步efficiency improvement 效率提高reaction 反应separation 分离heat exchange 热交换reactive distillation 反应精馏capital expenditure 基建投资setup 装置capital outlay 费用,成本,基建投资yield 产率,收率reaction byproduct 反应副产物equilibrium constant 平衡常数waste 废物feedstock 进料,原料product 产物,产品percent conversion百分比转化率ether 乙醚gasoline汽油oxygenate content 氧含量catalyst 催化剂reactant 反应物inert 惰性物,不参加反应的物质reactive distillation 反应精馏energy saving 节约能量energy efficiency 能量效率heat—sensitive material 热敏性物质pharmaceutical 制药foodstuff 食品gas diffusivity气体扩散性,气体扩散系数gas adsorption 吸收;absorption:吸附specialty chemical特殊化学品,特种化学品batch间歇的;continuous:连续的micro—reactor 微型反应器hydrogen and methane oxidation 氢气和甲烷氧化反应ethylene epoxidation 乙烯环氧化反应phosgene synthesis 光气合成.commercial proportions 商业规模replication 复制sensor 传感器,探头separation of solids 固体分离suspension 悬浮液porous medium 多孔介质filtration 过滤medium 介质filter 过滤器trap 收集,捕集Buchner funnel 布氏漏斗Vacuum 真空conical funnel 锥形漏斗filter paper 滤纸area 面积filter cake 滤饼factor 因数,因子,系数,比例viscosity 黏度density 密度corrosive property 腐蚀性particle size 颗粒尺寸shape 形状size distribution 粒度分布packing characteristics填充性质concentration 浓度filtrate 滤液feed liquor 进料液pretreatment 预处理latent heat 潜热resistance 阻力surface layer 表面层filtering medium 过滤介质drop in pressure 压降filtering surface 过滤表面filter cake 滤饼cake filtration 饼层过滤deep bed filtration 深层过滤depth 深度law 定律net flow 净流量conduction 传导convection 对流radiation 辐射temperature gradient 温度梯度metallic solid 金属固体thermal conduction 热传导motion of unbound electrons 自由电子的运动electrical conductivity 导电性thermal conductivity 导热性poor conductor of electricity 不良导电体transport of momentum 动量传递the random motion of molecules 分子无规则运动brick wall 墙壁furnace 火炉,燃烧器metal wall of a tube 金属管壁macroscopic particle 宏观的粒子control volume 控制体enthalpy 焓macroscopic phenomenon 宏观现象forces of friction 摩擦力fluid mechanics 流体力学flux(通量,流通量) of enthalpy 焓通量eddy 尾流,涡流turbulent flow 湍流natural and forced convection 自然对流和强制对流buoyancy force 浮力temperature gradient 温度梯度electromagnetic wave 电磁波fused quartz 熔化的石英reflect 反射,inflection:折射matte无光泽的,无光的temperature level 温度高低inter-phase mass transfer界相际间质量传递rate of diffusion扩散速率acetone 丙酮dissolve 溶解ammonia 氨ammonia-air mixture 氨气-水混合物physical process 物理过程oxides of nitrogen 氮氧化物nitric acid 硝酸carbon dioxide 二氧化碳sodium hydroxide 氢氧化钠actualrate of absorption 实际吸收速率two—film theory 双膜理论concentration difference 浓度差in the vicinity of 在…附近,靠近。
泥沙颗粒在冲击式水轮机斗叶内壁面的冲蚀磨损研究曹永;宋文武;符杰;宿惟【摘要】为研究冲击式水轮机斗叶内泥沙颗粒的运动特性,分析其对斗叶内壁面的冲蚀磨损影响,建立了斗叶的三维数学模型.利用FLUENT软件,对连续相使用欧拉方程进行计算,达到收敛后再选用拉格朗日方程对离散相-泥沙颗粒进行固液耦合计算.数值分析得出:在相同泥沙颗粒直径和浓度条件下,冲击速度越大,斗叶内壁面的冲蚀磨损也越大;在相同冲击速度和浓度条件下,颗粒直径越大,冲蚀磨损越大;相同泥沙颗粒冲击速度和直径条件下,浓度越大,冲蚀磨损也越大.研究表明,斗叶内壁面的冲蚀磨损主要由泥沙颗粒直径、冲击流速和浓度共同决定.【期刊名称】《水力发电》【年(卷),期】2014(040)007【总页数】5页(P75-78,85)【关键词】斗叶;冲蚀磨损;冲击式水轮机;固液耦合;数值分析【作者】曹永;宋文武;符杰;宿惟【作者单位】西华大学流体及动力机械教育部重点实验室, 四川成都610039;西华大学流体及动力机械教育部重点实验室, 四川成都610039;西华大学流体及动力机械教育部重点实验室, 四川成都610039;西华大学流体及动力机械教育部重点实验室, 四川成都610039【正文语种】中文【中图分类】TK7350 引言目前,我国低水头的水力资源已快开发殆尽,高水头水力资源却有待全面开发。
西南地区由于其特殊的地理环境,有着相当丰富的高水头水力资源。
因此,有必要对高水头冲击式水轮机进行深入分析研究,特别是影响斗叶内壁面冲蚀磨损的主要因素。
然而,冲击式水轮机斗叶中的水流过程非常复杂,包括压力损失、二次流、薄层水流、自由面流、水花飞溅、不稳定性以及各个部件间复杂的相互作用,增加了分析的难度。
在理论研究上,文献 [1-3]主要针对冲击式水轮机的冲蚀磨损机理和摩擦定律进行了研究。
文献[4-5]研究了颗粒在流场中的运动规律,推导任意流场中的颗粒运动方程。
文献 [6-7]推导了颗粒对壁面的冲蚀磨损控制方程。
机械专业的英语Title: Mechanical Engineering: A Comprehensive Overview Mechanical engineering is a multidisciplinary field that integrates principles of physics, mathematics, and material science to design, analyze, and manufacture mechanical systems. From the smallest micro-scale devices to large-scale industrial machinery, mechanical engineers play a pivotalrole in shaping the modern world. In this comprehensive overview, we delve into various aspects of mechanical engineering, including its history, fundamental principles, key subfields, applications, and future prospects.**History of Mechanical Engineering:**Mechanical engineering has roots dating back to ancient civilizations, where early humans developed rudimentary tools and machines to aid in tasks such as agriculture and transportation. However, the formalization of mechanicalengineering as a distinct discipline emerged during the Industrial Revolution in the 18th and 19th centuries. Innovations such as the steam engine, textile machinery, and the development of precision manufacturing techniques propelled the field forward, laying the groundwork for modern mechanical engineering practices.**Fundamental Principles:**At the core of mechanical engineering are fundamental principles derived from physics and mathematics. These principles include mechanics, thermodynamics, fluid dynamics, and materials science. Mechanics deals with the behavior of solid bodies and structures under various loads and conditions, while thermodynamics governs the transfer of energy and heat in mechanical systems. Fluid dynamics focuses on the behavior of fluids (liquids and gases), and materials science explores the properties and behavior of engineering materials such as metals, polymers, and composites.**Key Subfields:**Mechanical engineering encompasses a diverse range of subfields, each specializing in different aspects of mechanical systems. Some key subfields include:1. **Mechatronics:** Combines mechanical engineering with electronics and computer science to design and control advanced systems such as robotics and automated manufacturing equipment.2. **Automotive Engineering:** Focuses on the design, development, and manufacturing of vehicles and their components, including engines, transmissions, and chassis systems.3. **Aerospace Engineering:** Involves the design and development of aircraft, spacecraft, and related systems, including aerodynamics, propulsion, and avionics.4. **Energy Systems:** Addresses the generation, conversion, and utilization of energy in various forms, including renewable energy technologies, power generation, and energy storage systems.5. **Manufacturing Engineering:** Focuses on optimizing manufacturing processes and systems for efficiency, quality, and cost-effectiveness, including techniques such as machining, casting, and additive manufacturing (3D printing).**Applications:**Mechanical engineering finds applications across numerous industries, driving innovation and technological advancement. Some notable applications include:1. **Transportation:** Designing and manufacturing vehicles, aircraft, and ships for transportation of goods and people.2. **Energy Production:** Developing renewable energy technologies such as wind turbines, solar panels, and hydroelectric systems, as well as traditional power generation methods.3. **Biomedical Engineering:** Creating medical devices and equipment, prosthetics, and biomedical implants to improve healthcare outcomes.4. **Manufacturing:** Optimizing production processes in industries such as automotive, aerospace, electronics, and consumer goods.5. **Infrastructure:** Designing and maintaining infrastructure systems such as bridges, tunnels, and buildings to ensure safety and durability.**Future Prospects:**The future of mechanical engineering is marked by rapid technological advancements and evolving global challenges.Emerging fields such as artificial intelligence, nanotechnology, and sustainable design are reshaping the landscape of mechanical engineering. Engineers are increasingly focused on developing eco-friendly technologies, improving energy efficiency, and addressing issues such as climate change and resource scarcity. With the rise of digitalization and Industry 4.0, mechanical engineers are leveraging data analytics, simulation tools, and automation to optimize design processes and enhance product performance.In conclusion, mechanical engineering is a dynamic and interdisciplinary field that continues to drive innovation and shape the world we live in. From pioneering new technologies to solving complex engineering challenges, mechanical engineers play a crucial role in advancing society and improving quality of life for people around the globe.。
附录附录1Sand CastingThe first stage in the production of sand castings must be the design and manufacture of a suitable pattern. Casting patterns are generally made from hard word and the pattern has to be made larger than the finished casting size to allow for the shrinkage that takes place during solidification and cooling. The extent of this shrinkage varies with the type of metal or alloy to be cast. For all but the simplest shapes the pattern will be made in two or more pieces to facilitate moulding. If a hollow casting is to be made the pattern design will include extension pieces so that spaces to accept the sand core are moulded into sand. These additional spaces in the mould are termed core prints.Sand moulds for the production of small and medium-sized castings are made in a moulding box. The mould is made in two or more parts in order that the pattern may be removed.The drag half of the mould box is placed on a flat firm board and the drag half of the pattern placed in position. Facing sand is sprinkled over the pattern and then the mould box is filled with moulding sand. The sand is rammed firmly around the pattern. This process of filling and ramming may be done by hand but mould production is automated in a large foundry with the mould boxes moving along a conveyor, firstly to be filled with sand from hoppers and then to pass under mechanical hammers for ramming. When ramming of the sand is complete, excess sand is removed to leave a smooth surface flush with the edges of the moulding box.The completed drag is now turned over and the upper, or cope, portion of the moulding box positioned over it. The cope half of the pattern is placed in position, correct alignment being ensured by means of small dowel pins. Patterns for the necessary feeder, runner and risers are also placed so as to give an even distribution of metal into the mould cavity. The risers should coincide with the highest readily escape from the mould. The sizes of risers should be such that the metal in them does not freeze too rapidly. An important function of a riser is to act as reservoir of liquid metal to feed solidification within the mould. A thin coating of dry parting sand is sprinkled into mould at this stage. This is to prevent the cope and drag sticking together when the cope half is moulded. The cope is now filled with moulding sand and this is rammed firmly into shape in the same manner as in the making of the drag.After the ramming of sand in the cope is completed the two halves of the moulding box are carefully separated. At this stage venting of the moulding box are carefully separated. At this stage venting of the mould can be done, if necessary, to increase the permeability of the mould.After venting the patterns are carefully removed from both cope and drag, and a gate or gates are carefully cut to connect the runner channel with the main cavity. Gates should be sited to allow for entry into mould with a minimum of turbulence. Any loose sand is gently blown away and if a core is to be used it the cope upon the drag and it is then ready for use. Liquid metal is poured smoothly into the mould via the feeder. Pouring ceases when liquid metal appears at the top of the risers and the feeder channel is also full.When the metal that has been poured into a sand mould has fully solidified the mould is broken and casting is removed. The casting still has the runner and risers attached to it and there will be sand adhering to portions of the surface. Runners and risers are cut off and returned to the melting furnace. Sand cores are broken and adherent sand is cleaned from the surface by vibration or by sand blasting with dry sand. Any fins or metal flash formed at mould parting lines are removed by grinding and the castings are then ready for inspection.EngineAn engine is a device that uses the energy in a fuel to do work. The energy in the chemicals of the fuel is turned into heat energy. The heat is then used to move the metal parts of a machine. There are many kinds of fuel. Most engines use gasoline, oil, kerosene, coal, or coke. The heat that comes from burning the fuel makes a gas expand. This expand gas drives pistons or turbine blades. The pistons or turbines turn shafts. The turning shafts move gears and other wheels. We use these rotating wheels and shafts to move automobiles, airplanes, and other transport. We can also use them for pumping, drilling, digging, and other such activities.Early engines burned coal or wood to heat water. The steam was used to drive steam engine. Until the middle of this century, most locomotives were powered by steam. At the beginning of the century, even some automobiles were run on steam. We still use steam engines, but most of them are being replaced by more efficient engines. Today we have powerful gasoline and diesel engines to work for us.The steam engine is an external combustion engine. This means that fuel is combustion, or burned, outside the cylinder that produces power. Since the invention of the steam engine by James Watt in 1769s, steam engines had a great effect on the industrial revolution in the eighteenth century. Until the middle of the twentieth century, most locomotives were powered by steam. At the end of the century, even some automobiles were run on steam. Today most of the functions of steam engine have been taken over by internal combustion engines fueled by gasoline and diesel oil. However, there are many steam engines in use at sea. Steam is also used to generate electricity. The kind of steam engine that is used today does not have cylinders. It is generally a steam turbine. The steam turbine was invented by Sir Charles Parsons. Steamturbines can handle steam at higher pressures than piston engines can, and they are more compact than piston engines of similar power.The gasoline engine The engine of most automobiles and small vehicle use gasoline as fuel. The gasoline engine is a combustion engine. The fuel is burned in combustion (burning) chambers inside the engine. The combustion chambers are placed at one end of the cylinders. Pistons move up and down in the cylinders. They are pushed by the hot gases from the burning fuel. When the fuel is mixed with air it burns so quickly that it explodes. The combustion chambers and cylinder apart like a bomb, the explosion simply kicks hand against the head of the piston. It pushes it as far as it can.Each movement of a piston up or down in its cylinder is called a stroke. Most gasoline engines work on a four-stroke cycle. This means that each piston goes up and down twice for each explosion. That makes four movement or strokes. This cycle of events is repeated over and over again. On the first down stroke, the piston moves to the lowest part of the cylinder. A mixture of gasoline droplets and air is drawn into the cylinder above it. Now the piston moves up again. This is its second stroke. It squeezes the mixture into a small space. An electric lights the mixture, and it explodes. The piston is force down again for its third stroke. This is called the power stroke. For the fourth stroke, the piston moves to the top again. This time it pushes the burnt gases out of the cylinder. The gases leave the engine as exhaust fumes.The first engine that used the four-stroke cycle was made in about 1876. It was designed by a German engineer, August Otto. He used coal gas, not gasoline. The first engines to burn gasoline were developed by Karl Benz and Gottlieb. These two men were famous as automobile pioneers.A piston simply going up and down cannot push an automobile along. Its movement must be changed to a turning movement. To do this, a crankshaft is used. Each piston of the engine is linked to part of the crankshaft. Each push it gives makes the shaft turn. The spinning shaft passes the power on to the automobile’s transmission system. It usually does this through a heavy flywheel. The transmission system transmits power to the clutch and to the propeller shaft, through a gearbox. The propeller shaft drives the road wheels by means of axles.To keep an automobile engine going, there need to be several systems. There must be a fuel system. This has to supply gasoline to the engine cylinders in the right amounts. It has also to mix it with the right amount of air, so that it will explode properly. There must be an ignition system. This has to provide sparks to ignite the explosive mixture fat exactly the right time. There has to be a cooling system, otherwise the engine would overheat. The lubrication system must keep all the moving parts oiled and moving freely. Too much friction causes wear of the metal and makes the engine overheat.The engine unit Gasoline engine has two basic parts. They are called the cylinder head andthe cylinder block. The cylinder block is machined from solid metal. The metals usually cast side the cylinder blocks are the cylinders. The walls of the cylinders have to be very accurately made, and are highly polished. The pistons that move up and down in the cylinders must be accurately made, too. They have springy bands of metal around them to press tight against the cylinder walls and stop gases leaking. The bands are called piston rings. They are often made of aluminum alloy for strength and lightness.An engine may have any number of cylinders. They may be arranged in a line, or in opposite pairs. They are often arranged in a “V” shape. In many air planes with piton engines, the cylinders are arranged in a ring around the crankshaft.The lower part of the cylinder block is called the crankcase. This is where the crankshaft lies. The crank shaft is linked to each piton by a connecting rod. The crankshaft is made in a single piece. It must be tough and accurately machined. It may spin as many as 6000 times a minute. It changes up-and-down motion. It does this by means of cranks, one for each piston. The cranks are set at different angles round the shaft. Each piston gives a push to its crank during its power stroke. During the other three strokes, the crank pushes the piston up ,down and up again. The heavy flywheel is bolted to one end of the crankshaft. It keeps the shaft turning smoothly between the power strokes. Strong main bearings support the crankshaft in its case.The cylinder head is bolted to the cylinder block. Inside it are the combustion chambers. Each combustion chamber is a space above a piston inside a cylinder. This is where the explosio n of the mixture of fuel and air takes place. A spark plug is set into the top of the chamber. Each chamber has a pair of valves. There is an inlet valve to allow the fuel and air mixture into the chamber. The other valve is an outlet or exhaust valve. Through this pass the burnt gases after the explosion. The valves are opened and closed by push rods and springs. The push rods are moved up and down by links with the crankshaft. The linkage is through a turning shaft called the camshaft.To carry water to cool the engine, there are passages in the metal of the cylinder head and cylinder block. Oil passes through other passages. Between the cylinder head and block is a gasket.This is a thin plate of metal that acts as a seal. It is put in when the parts o f the engine are bolted together. It is often made of copper.The fuel system Fuel system of the engine supplies the gasoline to be burnt. The gasoline is stored in a large tank. In a powerful car, the tank holds many gallons of fuel. The tank is placed well away from the engine, to reduce the risk of fire .The gasoline is pumped through a fuel line. The pump may be driven by links with the engine camshaft. Sometimes it has its own electric motor. Before the gasoline reaches the cylinders, it must be mixed with air. The fuel lineleads to the carburetor. In the carburetor the gasoline is forced through a fine nozzle, or jet. It forms a spray of small droplets. The droplets vaporize as they mix with the air. Now the mixture is ready for ignition.The speed of the engine is controlled by a valve. Opening and closing the throttle valve regulates the amount of mixture leaving the carburetor. From the carburetor the mixture passes to the inlet valves of the combustion chambers. The mixture is delivered through a set of tubes called the inlet manifold. A similar set of tubes takes away exhaust gases form the exhaust valves of the combustion chambers. This is called the exhaust manifold. It leads to the outside air through the exhaust pipe.In some automobiles, the fuel is delivered by a different system. Instead of passing through a carburetor, the fuel is sprayed into the air stream just before the inlet valves. It is sprayed in small amounts, which are carefully metered. The system is called fuel injection.The ignition system Mixture inside each cylinder must be made to explode. A spark is used to do this. The spark must jump across the gap in the spark plug at exactly the right times, each of the autombile’s cylinders must fire in turn. The igniti on system depends upon very accurate timing. If the sparks are a fraction of a second too early or too late, the engine will not run properly.The electricity to make the sparks comes from the automobile’s electric storage battery. This battery is kept charged by a dynamo, or generator, run by the engine. The battery supplies electricity at only about 12 volts. To make a spark, volts are required. The voltage from the battery is boosted up to about 30 000 volts by means of a transformer. The transformer is called the ignition coil. The ignition coil supplies high voltage to the distributor. This is a device that distributes in surges, or pulses, to each of the spark plugs in turn. When a surge of electricity at high voltage reaches a plug, a spark leaps across a small gap. The spark is so hot that it makes the mixture of gasoline and air ignite and explode.The cooling system Heat produced by burning the gasoline in the engine is very great. The temperature inside each combustion chamber may reach more than 1 000℃ [over1 800].The engine must be constantly cooled. The cooling system supplies cool water through channels called water jack. The water jackets surround the cylinders. They carry away the excess heat as the water passes through them. The hot water is led away to be cooled in radiator. The radiator is a system of many tubes, linked together, with spaces between them. The hot water loses its heat to the air. The cooled water is then pumped to the engine again.Some automobiles do not have a water-cooled system. They use air cooling. Air from the frontOf the automobile is blown over the cylinder block and the cylinder head. The engine is filledwith special cooling fins, sticking out into the air stream. These help the head to radiate more quickly. Air-cooled engines tend to be noisier than water-cooled engines. In a water-cooled engine, the water jacket helps to absorb the engine noise.To prevent the water in the cooling system from freezing in cool weather, antifreeze is usually added in water. This is often ethylene glycol or a similar compound.The lubrication system Oil is needed to keep the engine’s parts from wearing too quickly. A storage tank of oil, called the sump, is attached under the crankcase. The oil is pumped through channels to all the main bearings and the big-end bearings. Eventually it reaches the sump again. It passes through a filter to remove dirt before it is used again. Whenever metal surfaces rub against others, ting particles are worn off. The oil picks them up as it flows between the surfaces .They are trapped by the oil filter. The filter must be changed regularly. The oil itself gradually burns and becomes impure. It must be replaced at intervals.The wankel engine The wankel engine is a gasoline engine that works without pistons. It was invented in Germany by Felix Wankel. He started development of it in 1956. The pistons in an ordinary gasoline engine must move up and down, or backwards and forwards. This kind of motion is called reciprocating motion. It needs to be converted into a turning motion (rotary motion) by a crankshaft. In a Wankel engine, burning the flue produces a rotary motion directly. These is no need for a crank shaft, It is a rotary engine.A Wankel engine has a specially designed combustion chamber. It is roughly an ellipse, , I n shape. Inside is rotor. The rotor is shaped with bulging, rounded sides. Though the center of the rotor passes the driving shaft, it has teeth like a gearwheel that meet teeth inside the rotor. The rotor is shaped so that its corners just touch the walls of the chamber. The rotor can move up and down and also side to side as it turns.The rotor divides the chamber into three parts. As the rotor the shapes of the three parts change. They act like three separate combustion chambers. As in an ordinary engine, there are spark plugs, an inlet port for the gasoline and air mixture, and an outlet port for the exhaust gases.The rotor turns so that each part of chamber in turn meets the inlet. The gasoline and air mixture is drawn in. This is like the first piston down stroke of an ordinary engine. Further turning sweeps the mixture round into a smaller space .The mixture is compressed. This is like the second stroke. Now the spark plugs fires. The explosion drives the rotor further around. This is the power stroke. When the rotor has turned a little further, the exhaust gases are pushed from the chamber through the exhaust port. The process is continuous. It happens as each part of the chamber sweeps round.The Wankel engine has several advantages over an ordinary engine. It has fewer moving parts. There is less vibration. It is lighter, it costs less to produce. However, there are difficulties. Themain difficulty is ensuring that the seals, where the corners of the rotor meet the chamber walls, are gastight. The Wankel engine is used successfully in several kinds of automobile.The diesel engine The diesel engine is a type of internal combustion engine that is used for heavy-duty work. It uses low-cost oil for fuel, and usually has a long life. Railroad locomotives, trail trucks, buss, tractors, and road building equipment are powered by diesel engine .Ships and electric power generating stations also use diesel engine. Small models are used to power some automobiles. The diesel engine was developed in 1897 by Rudolf Diesel.The diesel engine differs from the gasoline engine in two main ways. The diesel is a compression-ignition engine, whereas the gasoline engine is a spark-ignition engine. In a diesel engine, air is compressed in each cylinder, causing its temperatures to rise. Fuel is then injected into the cylinders. The heat of the air causes the mixture to ignite and to explode. Gasoline engines use electric sparks to ignite the fuel and air mixture in the cylinders. Diesel engines use low grade oils that require less refining than gasoline and are less expensive.Pressure of over 10500 KN per square meter [1500 lbs per square in] is built up in the cylinder of a diesel engine by compression and the subsequent explosion, or combustion. This pressure forces the piston downwards, which turns the crankshaft. Cylinder walls and most other parts of diesel engines are thicker and stronger than those parts in gasoline engines so they can stand the extra strains and stresses.There are two main types of diesel engines, the four-stroke engine and the two-stroke engine. In the four-stroke model, which is the larger and more powerful of the two, each moves down, up, down, and up to complete a cycle. The first down stroke draws air into the cylinder. The second down stroke is the power stroke .The second up stoke exhaust the gases produced by combustion.In a two-stroke diesel engine, the exhaust and intake of air occur though openings in the cylinder near the end of the power stroke. The one up stoke is the compression stroke. The down stoke is the power stroke. Two-stroke engines have twice as many power stroke recycle as four-stroke engines. Two-stroke engines are used for applications that require high power in a small engine.……附录2砂型铸造砂型铸造生产的第一步是设计并制作一个合适的模型。
A Micro-Mechanical Simulation of Sand Liquefaction Behavior by DEMDanda Shi 1, Jian Zhou 2, Jianfeng Xue 3 and Jiao Zhang 41Lecturer, College of Ocean Environment and Engineering, Shanghai Maritime University, Shanghai 200135, China; shidanda@ 2Professor, Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; tjuzj@ 3Lecturer, School of Applied Science and Engineering, Monash University, Churchill, 3842, VIC, Australia; jianfeng.xue@.au 4Lecturer, Department of Civil Engineering, Shanghai Technical College of Urban Management, Shanghai 200432, China; ggglg@ABSTRACT: A two-dimensional Particle Flow Code (PFC2D) was applied to simulate sand liquefaction behavior induced by cyclic loading. The numerical sample was prepared with 4061 discs with its particle size distribution similar to Fujian Standard sand. Based on the theory of strain-controlled undrained cyclic triaxial test, a constant volume numerical test was carried out under cyclic loading with uniform strain amplitude. The macroscopic responses of the sample were obtained and the variation of average coordination number under cyclic loading was analyzed. The effects of cyclic strain amplitude and confining pressure on liquefaction resistance were further analyzed in numerical simulations. It was found that the numerical tests reproduced the general characteristics of liquefaction behavior of saturated sand under cyclic loading. The effects of cyclic strain amplitude and confining pressure on the liquefaction resistance of the numerical sample were comparable with reported experimental results.INTRODUCTIONLiquefaction is an important phenomenon associated with the undrained response of loose granular materials. Various types of laboratory tests have been conducted to study the development of liquefaction under cyclic loading, such as the cyclic triaxial test, cyclic simple shear test and cyclic torsional test (e.g. Seed and Lee, 1966; Ishihara et al, 1975; Koseki et al, 2005). The studies have focused on the stress-strain relationships and the generation of cumulative excess pore water pressure under undrained cyclic loading conditions. Ishihara et al (1975) presented typical results of strain-controlled undrained cyclic triaxial tests. They observed that during a strain-controlled cyclic loading test, the progressively buildup of pore water pressure causes the migration of effective stress path towards the origin and the increase of stress ratio of shear stress to mean effective principal stress. Nevertheless, the responses of materials in laboratory tests are very sensitive to the methods of sample preparation and the rate of loading etc.204D o w n l o a d e d f r o m a s c e l i b r a r y .o r g b y H o h a i U n i v e r s i t y L i b r a r y o n 12/28/15. C o p y r i g h t A S CE .F o r p e r s o n a l u s e o n l y ; a l l r i g h t s r e s e r v e d .Hence quantitative evaluation of dynamic behavior of soil with physical modeling remains difficult.Analytical treatments on liquefaction behavior of granular materials generally assume continuum behavior even while soil is a multiphase particulate medium. Problems arise with this assumption due to soil’s inherent granular nature and the consequent deformation and failure modes. The continuum models are phenomenological, and primarily concerned with mathematical modeling of the observed phenomena without detailed attention to their fundamental physical significance. Discrete Element Method (DEM) pioneered by Cundall (1971) is a useful tool for an in-depth understanding of the fundamentals of liquefaction behavior. The method models the assemblies as discrete particles interacting through contact forces. The macro behavior of soils can be obtained by keeping track of micro behavior of soil particles.In this paper, a strain-controlled undrained cyclic triaxial test was firstly conducted on Fujian standard sand with relative density of 30%. Based on experimental results, a two-dimensional discrete element method computer code PFC2D was then used to investigate the liquefaction behavior of an assembly of 4061 discs subjected to undrained (constant volume) cyclic loading. Both macro- and micro-scale response of numerical samples were comprehensively studied. The effects of cyclic strain amplitude and confining pressure on liquefaction resistance were also analyzed.EXPERIMENTAL TESTFujian standard sand, a standard sand often used by researchers in China, was used for the strain-controlled cyclic triaxial test in the lab. The physical properties and particle size distribution of the material are presented respectively in Table.1 and Fig.1. A specimem of 38mm in diameter and 76mm in height was created by air pluviation method to a void ratio of 0.749. The specimen was saturated with de-aired water flowing from the bottom to the top and thereafter a back pressure of 200kPa was applied to improve the degree of saturation. The measured value of pore water pressure coefficient (B ) was above 0.98. After the process of saturation, the specimen was isotropically consolidated under a confining pressure of 200kPa. Deviatoric strain (ε1−ε3) amplitude (εsm ) of 0.45% was cyclically applied under a frequency of 1Hz. The “initial liquefaction” criterion suggested by Seed and Lee (1966) was used to define the liquefaction of sand. Table 1. Physical properties of tested sand Properties Values specific gravity (G s ) 2.643 maximum void ratio (e max ) 0.848minimum void ratio (e min ) 0.519 mean particle size (D 50) /mm 0.34 coefficient of uniformity (U c ) 1.542 coefficient of curvature (C c ) 1.104p e r c e n t a g e s m a l l e r (%)particle size (mm) Fig.1. Particle size distributionGEOTECHNICAL SPECIAL PUBLICATION NO. 200205D o w n l o a d e d f r o m a s c e l i b r a r y .o r g b y H o h a i U n i v e r s i t y L i b r a r y o n 12/28/15. C o p y r i g h t A S CE .F o r p e r s o n a l u s e o n l y ; a l l r i g h t s r e s e r v e d .Fig.2 shows the results of the laboratory test. In the Figures and the following, q is defined as shear stress ((σ′1−σ′3)/2), p ′ is defined as mean effective principal stress ((σ′1+σ′3)/2), εs is defined as deviatoric strain (ε1−ε3) and excess pore water pressure ratio (r u ) is defined by the ratio of pore water pressure (u ) to the initial confining pressure (σ′30).From Fig.2, some typical liquefaction characteristics of saturated loose sand under strain-controlled cyclic loading condition can be concluded:(1) The mean effective principal stress decreases gradually and steadily, and the effective stress path gradually migrates to origin due to the cumulative buildup of pore water pressure as shown in Fig.2(a). It is noted that the magnitude of shear stress during compression is larger than that during tension.(2) The sample attains a peak shear stress of 87.2kPa in the first cycle. Thereafter shear stress reduces gradually in successive cycles and finally reaches zero (Fig.2(b)). It is clearly denoted that both strength and stiffness of the sample experience significant loss with successive cyclic loading.(3) Fig.2(c) displays a sharp increase of pore water pressure in the first and second cycles, and the sample reaches the initial liquefaction state after about 7 cycles.NUMERICAL SIMULATIONSample preparationA biaxial numerical sample was created using PFC2D program with 85mm in height and 40mm in width. The particle diameter ranges from 0.6mm to 1.2mm. The sample composed of 4061 particles with the particle size distribution plotted in Fig.1. The two-dimensional void ratio of the sample is 0.316. The U c and C c values of numerical sample are 1.529 and 1.095, which are very close to those of the sand sample (indicated in Table1). The value of D 50 of numerical sample is 0.9mm, which is about three times of that of the sand. The objective of enlarging particle size is to reduce the particle number generated in the simulation. It is concluded by Jensen et al (2001) that enlarging particle size will not significantly affect the macro response of numerical sample, provided that the ratio of the mean particle sizes (D 50) less than 30.In PFC2D, a linear or a non-linear Hertz-Mindlin contact model can be used for the description of contact behavior between particles. The parameter calibration for the simulation of Fujian standard sand with linear or non-linear Hertz-Mindlin model has(a) p ′ (kPa) q (k P a )050100150200250-100-80-60-40-20020406080100 (c) r uNumber of cycles (N ) 0123456789100.00.20.40.60.81.0(b ) εs (%) q (k P a )-100-80-60-40-20020406080100-0.90-0.450.000.450.90Fig.2. Results of the laboratory test GEOTECHNICAL SPECIAL PUBLICATION NO. 200206D o w n l o a d e d f r o m a s c e l i b r a r y .o r g b y H o h a i U n i v e r s i t y L i b r a r y o n 12/28/15. C o p y r i g h t A S C E . F o r p e r s o n a l u s e o n l y ; a l l r i g h t s r e s e r v e d .already been done in authors’ previous research (Zhou and Shi, 2007). In the present study, a non-linear Hertz-Mindlin model was used to describe the particle contact behavior with the values of micro parameters of shear modulus G u =5×1011Pa and poisson’s ratio νu =0.35. Coulomb friction law was adapted for the relative slipping between particles with friction coefficient f c =0.8. The particle density is 2.643×103kg/m 3, which is the same value as Fujian standard sand.An isotropic confining pressure of 200kPa was applied on the sample by a numerical servo-control procedure. Constant volume cyclic shear test was performed with four boundary walls moving in two-way prescribed velocities. By doing this, an undrained strain-controlled cyclic test taken in experimental test can be numerically simulated (Ng and Dobry, 1994; Sitharam, 2003). It was assumed that the all-round total stress is constant and equal to σ′30 during this constant volume cyclic part of the test, as in cyclic triaxial test. Thus, the excess pore water pressure in numerical simulation was defined as the difference between the calculated horizontal stress and the initial confining stress.Results of numerical simulationThe results of numerical simulation are shown in Fig.3. Fig3(a) shows the plot of shear stress (q ) versus mean effective principal stress (p ′). The effective stress path move progressively towards origin and the rate of movement is more remarkable in the first two cycles than in the subsequent cycles. The sample reaches the initial liquefaction state after 4 cycles. The effective stress path does not rest on the origin when the sample is in the post-liquefaction stage, but moves up and down companied with the loading and unloading cycles. This special feature is called as “phase transformation” behavior in laboratory tests (Ishihara et al, 1975), and can be well reproduced in the simulation.Fig.3(b) shows the plot of shear stress (q ) versus deviatoric strain (εs ). It can be obviously seen that the calculated hysteresis loops gradually declined with the number of cycles increases. The shear stress decreases faster in the first cycle. The decrease of shear stress and the degradation of cyclic modulus are quite comparable to the experimental results in Fig.2(b).Fig.3(c) shows the plot of excess pore water pressure ratio (r u ) versus the number of cycles (N ). Compared with experimental results (Fig.2(c)), although the number of cycles to initial liquefaction are not equal, the increase regularity of excess pore water pressure is similar to that observed in the laboratory test.Fig.3(d) shows the plot of stress ratio (q /p ′) versus deviatoric strain (εs ). It is clearly shown that there is a progressive increase in stress ratio on both compression and extension sides as the number of cycles increases. The maximum value of stress ratio will not exceed ±1.0 in the process of cyclic loading. This response reflected in the numerical test is in good agreement with experimental results reported by Wang (2003), whose research illustrated the distinction and interrelation between liquefaction, state of limit equilibrium and failure of soil mass.Fig.3(e) shows the plot of average coordination number (C n ) versus the number of cycles (N ). C n is calculated as the total number of contacts divided by the number of particles. The decreasing tendency of average coordination number with increasing N isGEOTECHNICAL SPECIAL PUBLICATION NO. 200207D o w n l o a d e d f r o m a s c e l i b r a r y .o r g b y H o h a i U n i v e r s i t y L i b r a r y o n 12/28/15. C o p y r i g h t A S CE .F o r p e r s o n a l u s e o n l y ; a l l r i g h t s r e s e r v e d .FIG.3. Results of numerical simulationFIG.4. Effect of cyclic strain amplitudeclearly displayed. The results showed that, the coordination number decreases a little before initial liquefaction occurs, which means that, the reduction of the number of contacts between particles start to reduce dramatically after initial liquefaction. This results in a decrease of effective stress in the macro scale.Effect of cyclic strain amplitudeAccording to the findings of previous experimental studies, the magnitude of cyclic strain amplitude will significantly affect the liquefaction resistance of sand deposits. Vasquez and Dobry (1988) carried out a series of strain-controlled cyclic torsional tests on saturated loose sand and found that the higher the magnitude of strain amplitude, the greater is the liquefaction potential.(a) p ′ (kPa) q (k P a )050100150200250-100-80-60-40-20020406080100 (b) εs (%) q (k P a )-0.90-0.450.000.450.90-100-80-60-40-20020406080100(c)r uN 0123456789100.00.20.40.60.81.0(d) εs (%) q /p ′-0.90-0.450.000.450.90-1.2-1.0-0.8-0.6-0.4-0.20.00.20.40.60.81.01.2(e) N C n012345678910012345050100150200250-100-80-60-40-20020406080100 p ′ (kPa) q (k P a )r uN 024681012141618200.00.20.40.60.81.0(a) εsm =0.05% (d) εsm =0.45% (c) εsm =0.2% p ′ (kPa)q (k P a )050100150200250-100-80-60-40-20020406080100r uN 024681012141618200.00.20.40.60.81.0(b) εsm =0.1% p ′ (kPa) q (k P a )050100150200250-100-80-60-40-20020406080100 r uN024681012141618200.00.20.40.60.81.0 p ′ (kPa)q (k P a )050100150200250-100-80-60-40-20020406080100 r uN 024681012141618200.00.20.40.60.81.0 GEOTECHNICAL SPECIAL PUBLICATION NO. 200208D o w n l o a d e d f r o m a s c e l i b r a r y .o r g b y H o h a i U n i v e r s i t y L i b r a r y o n 12/28/15. C o p y r i g h t A S C E . F o r p e r s o n a l u s e o n l y ; a l l r i g h t s r e s e r v e d .FIG.6. Effect of confining pressureIn this study, numerical tests at 0.05, 0.1, 0.2 and 0.45% deviatoric strain amplitude (εsm ) were conducted. Fig.4 shows the response of effective stress path and excess pore water pressure of numerical samples at different strain amplitude level. As shown in Fig.4, the number of cycles to liquefaction failure (N f ) are 17, 8, 6 and 4 cycles at εsm =0.05, 0.1, 0.2 and 0.45%, respectively.Fig.5(a) shows the liquefaction resistance curve (εsm ~N f ) of numerical samples. In order to compare with laboratory tests, the experimental results of anisotropically consolidated loose sand achieved by Vasquez and Dobry (1988) are plotted in Fig.5(b). By comparison of numerical and experimental results, it is seen that numerical simulations can qualitatively capture the decreasing tendency of liquefaction resistance with the number of cycles as typically exhibited in laboratory tests.Effect of confining pressureNumerical tests at different confining stress levels were carried out, and the results were shown in Fig.6. It can be seen from Fig.6 that the number of cycles to trigger liquefaction increases as confining pressure increases. For further analysis of the effect of strain amplitude and confining pressure, a set of numerical tests at different strain amplitude (εsm =0.05, 0.1, 0.2 and 0.45%) were conducted at three stress levels (σ′30=100, 200 and 300kPa). As in a stress-controlled cyclic loading test, the definition of cyclic stress ratio (CSR) was commonly used to describe the liquefaction resistance of the sample. It is recommended by Uchida and Stedman (2001) that CSR can also beFIG.5. Plots of εsm versus N fN f εs m(%) (a) numerical results 1101000.010.1110N f εs m (%)K c =2.0K c =1.5 (b) experimental results (after Vasquez and Dobry, 1988) (b) σ′30=300kPa (a) σ′30=200kPa (c) σ′30=400kPa (d) σ′30=500kPa 050100150200250300350-100-80-60-40-20020406080100 0.00.20.40.60.81.0024681012141618200.00.20.40.60.81.0q max050100150200250-100-80-60-40-2020406080100 p ′ (kPa)q (k P a )r uN p ′ (kPa)q (k P a )r uN 050100150200250300350400450-100-80-60-40-20020406080100024681012141618200.00.20.40.60.81.0050100150200250300350400450500550-100-80-60-40-20020406080100 0.00.20.40.60.81.0 p ′ (kPa)q (k P a )r uN p ′ (kPa)q (k P a )r uN GEOTECHNICAL SPECIAL PUBLICATION NO. 200209D o w n l o a d e d f r o m a s c e l i b r a r y .o r g b y H o h a i U n i v e r s i t y L i b r a r y o n 12/28/15. C o p y r i g h t A S CE .F o r p e r s o n a l u s e o n l y ; a l l r i g h t s r e s e r v e d .used in a strain-controlled cyclic loading test, and the definition of CSR in a strain-controlled test is30max CSR σ′=q(5)Where q max is the value of shear stress during compression in the first loading cycle, as indicated in Fig.6(a).The plot of CSR versus N f achieved from numerical tests is shown in Fig.7(a). Fig.7(b) shows the experimental results of stress-controlled cyclic triaxial tests on Hangzhou river sand performed by Ke et al (2004). The figures showed that, with the decrease of CSR, the number of cycles to initiate liquefaction increases. The relationship is more linear in the physical tests by Ke. In numerical modeling, CSR reached to a higher value of 0.33 at the confining pressure of 100kPa. This might due to the reason that in numerical modeling, the density of samples is easier to control than in physical tests. Another reason might due to the difference of the material used in the two tests.CONCLUSIONSThe results of this investigation showed the power of DEM technique in simulating the liquefaction behavior of saturated sand. Some distinctive features observed in laboratory tests on sand, such as the excess pore water pressure buildup to initial liquefaction, hysteresis loop degradation and the “phase transformation” behavior, can all be well reproduced by numerical simulations. The regularities of the influences of cyclic strain amplitude and confining pressure on liquefaction resistance previously found in laboratory tests on actual sand can be also qualitatively achieved from numerical simulations. The micromechanical information such as the variation of average coordination number can be well presented with DEM. This research provides a basis for further quantitative research on sand liquefaction by DEM.ACKNOWLEDGMENTSThe authors appreciate the support from the National Nature Science Foundation of China (No. 50909057, 90815008).N fC S R(a) numerical results0.00.10.20.30.40.5N f C S R(b) experimental results (after Ke et al, 2004) FIG.7. Plots of CSR versus N f0.00.10.20.30.40.5GEOTECHNICAL SPECIAL PUBLICATION NO. 200210D o w n l o a d e d f r o m a s c e l i b r a r y .o r g b y H o h a i U n i v e r s i t y L i b r a r y o n 12/28/15. C o p y r i g h t A S C E . F o r p e r s o n a l u s e o n l y ; a l l r i g h t s r e s e r v e d .REFERENCESCundall, P.A. (1971). "A computer model for simulating progressive large scale movements in blocky rock systems." ISRM Symp., Nancy, France, Proc.2: 129-136. Ishihara, K., Tatsuoka, K. and Yasuda, S. (1975). "Undrained deformation and liquefaction of sand under cyclic stresses." 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C o p y r i g h t A S CE .F o r p e r s o n a l u s e o n l y ; a l l r i g h t s r e s e r v e d .。