S1 - 10
Stress Amplitude
S-N 方法 – 相似理论
Unnot ched Shaft Notched Shaft Life in Cycles
snom
s nom
The life of this . . . . . . . . . . . . . . . . is the same as the life of this . . . . . if both are subject to the same nominal stress
S1 - 9
S-N 方法
• 也称为应力-寿命和全寿命方法
• 评估产生严重失效的总疲劳寿命
• 疲劳寿命由对数应力-循环(S-N)曲线计算
• 该方法适合于长寿命疲劳失效问题,因为该
方法是基于名义弹性应力,即使有小的塑性
发生。 PAT318A, Section 1, October 2012
Copyright© 2012 MSC.Software Corporation
Fatigue Line)
Elastic (High Cycle Fatigue Line)
PAT318A, Section 1, October 2012 Copyright© 2012 MSC.Software Corporation
N
S1 - 14
S-N和E-N疲劳曲线比较
Low Cycle Region
S1 - 7
Stage II Crack Growth
疲劳寿命计算方法概述
PAT318A, Section 1, October 2012 Copyright© 2012 MSC.Software Corporation