中国机械工程2017，Vol.28Issue(1)：40-44,5.DOI:10.3969/j.issn.1004-132X.2017.01.007
一种考虑应力梯度的疲劳寿命预测方法
Predicting Method for Fatigue Life with Stress Gradient
申杰斌 1唐东林1
作者信息
- 1. 西南石油大学机电工程学院，成都，610500
- 折叠
摘要
Abstract
Aiming at the problems that existed in the predicting the fatigue life processes by the critical distance method and the stress field intensity method,taking advantages of the two methods, an equivalent stress approach was proposed,where the effective stress average in spherical regions near the notch was taken as fatigue behavior control parameters.According to a set of fatigue tests, the relationship between the equivalent stress and spherical radius was studied,results show the rela-tionship is well represented in the form of linear and exponential functions,by defining the stress gra-dient and relative stress gradient,a fatigue life prediction model was constructed considering the stress gradient.Determination of parameters in the model was studied,The spherical radius with the same e-quivalent stress of the smooth specimen and the notched specimen was taken as the damage region size under action of fatigue limit in the same load condition.The spherical radius was obtained without test,so this method had a strong practicality.Validation of the fatigue test results indicates that the model prediction results are within 2 fold of the dispersion bands,show that the model has good pre-diction accuracy;the model may also predict the fatigue damage location.关键词
缺口/应力梯度/应力分布/疲劳寿命预测Key words
notch/stress gradient/stress distribution/fatigue life prediction分类
数理科学引用本文复制引用
申杰斌,唐东林..一种考虑应力梯度的疲劳寿命预测方法[J].中国机械工程,2017,28(1):40-44,5.
