弹丸侵彻钢筋混凝土的工程解析模型

第24卷 增1 岩石力学与工程学报 V ol.24 Supp.1 2005年8月 Chinese Journal of Rock Mechanics and Engineering Aug .，2005收稿日期：2005–04–28；修回日期：2005–05–30 基金项目：东北大学博士学位论文资助项目(200211)作者简介：朱浮声(1948–)，男，博士，1976年毕业于东北工学院采矿工程专业，现任教授、博士生导师，主要从事岩石力学与结构工程方面的教学与研究工作。

E-mail ：neuzfs@ 。

弹头形状对混凝土贯穿过程影响的数值模拟朱浮声1，2，张德海1，2(1. 东北大学 资源与土木工程学院，辽宁 沈阳 110004；2. 沈阳建筑大学 土木工程学院，辽宁 沈阳 110168)摘要：用梁–颗粒模型BPM 2D 对卵形头和平头动能弹贯穿混凝土平靶的过程进行数值模拟，给出贯穿过程中混凝土内部速度场的变化情况及混凝土的破坏区域。

梁–颗粒模型BPM 2D 是在离散元法基础上，结合有限元法开发的二维数值计算模型。

在模型中用3种类型梁单元形成混凝土数值试样，每种类型梁单元的力学性质均按Weibull 分布随机赋值以模拟混凝土细观结构的非均匀性，同时梁单元的强度随应变率不同而变化。

基于计算结果，分析了弹头部形状对贯穿过程的影响。

卵形头弹的贯穿过程是一种刺穿性模式，而平头弹是挤凿性模式。

贯穿同样的靶板，平头弹的能耗高于卵形头弹，残余速度小。

通过将卵形头弹的计算结果与试验数据相比较，表明梁–颗粒模型可有效应用于计算和模拟脆性材料动态破坏问题。

关键词：数值模拟；混凝土；贯穿；弹头部形状；梁–颗粒模型中图分类号：TU 502；O 347.3 文献标识码：A 文章编号：1000–6915(2005)增1–4843–06NUMERICAL SIMULATION OF PERFORATION IN PLAIN CONCRETEPANEL WITH NOSE SHAPE OF PERFORATORSZHU Fu-sheng 1，2，ZHANG De-hai 1，2(1. School of Resources and Civil Engineering ，Northeastern University ，Shenyang 110004，China ；2. School of Civil Engineering ，Shenyang Jianzhu University ，Shenyang 110168，China )Abstract ：The perforation into a plain concrete panel with ogival and flat nose perforators is numerically simulated with the BPM 2D (beam-particle model in two dimensions). The varieties of velocity field in concrete and failure zone surrounding the hole are described. The BPM 2D is presented on the basis of the DEM and the FEM. Three types of beam in the BPM 2D have been used to form numerical model of concrete. The mechanical properties of every type beam vary with their strain-rate ，and are randomly allocated according to Weibull distribution to reflect the initial heterogeneity of concrete at the mesoscale level. The effects of perforators nose shapes on the perforation are discussed with the calculated results. The destruction mode for the ogival nose perforator is a stabbing one ，while that for the flat nose perforator is a plugging one. The consumed energy for perforating a uniform target with the flat nose perforator is greater than that with the ogival nose perforator ，so that the residual velocity of the former is lower. The comparison of the simulated results with the experimental data shows that the BPM 2D is applicable to the simulation of dynamic failure problems for brittle materials.Key words ：numerical simulation ；concrete ；perforation ；nose shape of perforators ；beam-particle model1 引 言弹体对各种靶体的侵彻和贯穿是包含大变形及损伤和破坏的动态过程。