材料强化模型对板料回弹量的影响  

The Effect of Material Hardening Rule on Sheet Springback

作　　者：张冬娟[1] 崔振山[1] 李玉强[1] 阮雪榆[1] 

机构地区：[1]上海交通大学塑性成形工程系,上海200030

出　　处：《上海交通大学学报》2006年第10期1671-1674,共4页Journal of Shanghai Jiaotong University

摘　　要：基于Lemaitre and Chaboche非线性随动强化理论、等向强化和Mises屈服准则,建立了复杂加载模式下非线性混合强化材料模型的弹塑性应力应变本构关系,并采用Backward Euler切向预测径向返回算法计算应力应变增量.基于ABAQUS开发式程序接口,编写了非线性混合强化材料模型用户子程序.以Numisheet’93板料U型弯曲考题为例,分析了不同材料强化模型对板料回弹量的影响.结果表明,线性随动强化因模拟板料成形后的应力最小而低估了回弹量,各向同性强化因模拟成形后的应力最大而使预测的回弹量偏大.与Numisheet’93实验值的比较可知,对于复杂加载问题,采用非线性混合强化材料模型预测板料回弹量的精度最高.A stress-strain constitutive equation of non-linear combined hardening rule was proposed based on non-linear kinematic hardening theory of Lemaitre and Chaboche,isotropic hardening and Mises yielding criterion.The Backward Euler return mapping algorithm was applied to calculate the stress and strain increment.Based on the ABAQUS program interface,a UMAT subroutine of non-linear combined hardening was compiled.Taking a benchmark of Numisheet'93 2-D drawing bending as an example,the effect of material hardening rule on sheet springback was studied.The results indicate that the linear kinematic hardening under-predicts the springback because the stress after forming is the least.While the isotropic hardening over-predicts the springback since the stress after forming is the largest.The comparison with experimental data shows that the springback prediction accuracy by non-linear combined hardening is the best.

关 键 词：非线性随动强化 屈服准则 本构关系 径向返回算法 

分 类 号：TG386[金属学及工艺—金属压力加工]