摘要
传统的多轴疲劳时域分析法需要得到结构件整个随机加载历程,这种方法非常耗时,效率很低。针对这种情况,提出一种基于临界面上最大正应力和剪应力准则的频域分析方法。以悬臂梁作为疲劳强度评定算例,比较了基于Von Mises等效应力法的多轴疲劳时域法与提出的频域法的分析结果。研究结果表明,根据2种方法计算出悬臂梁4个工况疲劳寿命的相对误差在5%之内,而且使用频域分析法计算时间少,效率更高。
The tradifional time domain analysis method for multi-axis fatigue needs the whole stochastic loading process of the component.It is very time-consuming and inefficient.In this case,an frequency domain analysis method based on the maximum normal stress and shear stress criterion on the critical surface is proposed.This paper evaluates the fatigue strength of cantilever beam,for example.The result obtained by the time domain analysis method for multi-axis fatigue based on Von Mises equivalent stress is compared with one obtained by the frequency domain analysis method.The result shows that the relafive error of the fatigue life of the cantilever beam is within 5%,however,the efficiency of using the frequency domain analysis method is higher.
作者
周航博
肖守讷
阳光武
ZHOU Hangbo;XIAO Shoune;YANG Guangwu(State-Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,China)
出处
《机械制造与自动化》
2019年第1期84-88,共5页
Machine Building & Automation
基金
国家自然科学基金项目(U1534209)
牵引动力国家重点实验室自主课题(2015TPL_T013)
关键词
多轴疲劳
频域分析方法
临界面最大方差法
VonMiss等效应力法
悬臂梁
multiaxial fatigue
frequency domain analysis method
maximum variance method for critical surface
Von Mises equivalent stress method
cantilever beam