线性混合强化三维宏微观双尺度弹塑性模型及分析

ELASTIC-PLASTIC ANALYSIS OF 3D MACRO-MICRO TWO SCALE MODEL WITH LINEAR MIXED HARDENING

宏微观双尺度弹塑性模型通过宏微观联系因子获得微观尺度上的塑性应变,它是探讨高周疲劳损伤累积及其破坏机理的有效理论方法。基于双尺度弹塑性模型基本理论,研究了宏观载荷作用下具有塑性强化机制的微观应力应变演变规律,编写程序算法实现了比例混合塑性强化微观应力应变滞回曲线的求解。利用有限元软件Abaqus建立了三维实体模型,通过弹塑性分析获得相应的应力应变及其等效应力应变滞回曲线。对比有限元与本文算法结果,验证并校核了双尺度模型算法的有效性。

The theory of macro-micro two scale model obtains the micro plastic strains by using the macro-micro connecting factor,which is an effective theory to investigate the damage accumulation of the high fatigue and its failure mechanism.Based on the macro-micro theory,the evolution rule of the micro stresses and strains with plastic hardening was studied,and it solved the micro stresses and strains of the three-dimensional models by making programs,which considered the linear mixed plastic hardening.It established the 3 D finite element models,and calculated the micro stresses and strains and obtains the equivalent stress-strain hysteresis loops with linear mixed hardening.Compared with the finite element results,the effectiveness of the algorithm results is verified.