应用Neuber准则分析弹塑性材料缺口件时局部应力应变估计过高,因此预测初始寿命常给出过于保守的结论.由于当量应变能密度(Equivalent strain energy density,ESED)准则在Neuber准则的塑性变形项上增加了系数,局部应力应变估计结果更为...应用Neuber准则分析弹塑性材料缺口件时局部应力应变估计过高,因此预测初始寿命常给出过于保守的结论.由于当量应变能密度(Equivalent strain energy density,ESED)准则在Neuber准则的塑性变形项上增加了系数,局部应力应变估计结果更为准确.基于能量方法讨论了循环加载下材料的塑性应变能密度,发现ESED准则相比Neuber准则多考虑了塑性应变能密度,这是ESED准则局部应变场估计值远低于Neuber准则的估计值的能量理论基础.疲劳试验的结果验证了以上结论.展开更多
In the application of distortion energy theory to multiaxial fatigue prediction problems,it isquite frequent to meet with a confusion in the evaluation of the extremum values of equivalentstresses.In this paper,a desc...In the application of distortion energy theory to multiaxial fatigue prediction problems,it isquite frequent to meet with a confusion in the evaluation of the extremum values of equivalentstresses.In this paper,a description about this error is presented and discussed thereafter.Neces-sary correction has been made towards this problem.展开更多
文摘应用Neuber准则分析弹塑性材料缺口件时局部应力应变估计过高,因此预测初始寿命常给出过于保守的结论.由于当量应变能密度(Equivalent strain energy density,ESED)准则在Neuber准则的塑性变形项上增加了系数,局部应力应变估计结果更为准确.基于能量方法讨论了循环加载下材料的塑性应变能密度,发现ESED准则相比Neuber准则多考虑了塑性应变能密度,这是ESED准则局部应变场估计值远低于Neuber准则的估计值的能量理论基础.疲劳试验的结果验证了以上结论.
文摘In the application of distortion energy theory to multiaxial fatigue prediction problems,it isquite frequent to meet with a confusion in the evaluation of the extremum values of equivalentstresses.In this paper,a description about this error is presented and discussed thereafter.Neces-sary correction has been made towards this problem.
