四川大学学报：工程科学版2012，Vol.44Issue(2)：176-181,6.
AZ91E-T6镁合金平均应力松弛的本构描述及其在疲劳寿命预测中的应用
Constitutive Description of Mean Stress Relax of AZ91E-T6 Magnesium Alloy and Its Application in Fatigue Life Prediction
摘要
Abstract
Aiming at the phenomenon that when AZ91E-T6 magnesium alloy is subjected to cyclic loading with strain ratio R=εmin /εmax =0 and low strain amplitudes（Δε/2=0.003,0.005）,mean stress relax has a significant effect on the fatigue life,the Chaboche constitutive model was employed to describe the cyclic mean stress relaxation behavior of AZ91E-T6 magnesium alloy.The increment equation of Chaboche constitutive model was derived,and the cyclic stress-strain hysteresis curve and the mean stress of stable hysteresis loop were obtained under strain-controlled condition.The fatigue life of the material was predicted,combining the mean stress of stable hysteresis loop obtained by Chaboche constitutive model and Morrow＇s equation.Numerical results and experimental values was compared.It was shown that Chaboche constitutive model can describe cyclic mean stress relaxation behavior of AZ91E-T6 magnesium alloy and combining the calculated mean stress of stable hysteresis loop and Morrow＇s equation can predict the fatigue life of this material accurately.关键词
AZ91E-T6镁合金/应变幅/循环应力松弛/Chaboche本构模型/疲劳寿命Key words
AZ91E-T6 magnesium alloy/strain amplitude/cyclic stress relax/Chaboche constitutive model/fatigue life分类
通用工业技术引用本文复制引用
廖异,曾祥国,陈华燕,王清远,刘卫国..AZ91E-T6镁合金平均应力松弛的本构描述及其在疲劳寿命预测中的应用[J].四川大学学报：工程科学版,2012,44(2):176-181,6.基金项目
教育部创新团队计划资助项目 （）
四川大学青年教师科研启动基金资助项目 （）
