微薄板塑性成形本构关系研究  

Constitutive behavior of thin sheet metal in micro forming

作　　者：王匀[1] 董培龙[1] 许桢英[1] 朱永书[1] 陆广华[1] 袁国定[1] 

机构地区：[1]江苏大学机械工程学院,江苏镇江212013

出　　处：《功能材料》2008年第10期1641-1645,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50605029);中国博士后科学基金资助项目(20060390961);江苏省自然科学基金资助项目(BK2006551);高级人才启动基金资助项目(128300090)

摘　　要：尺寸效应的影响使得传统的成形理论和变形机制不再适用于微塑性成形。在考虑尺寸效应对微薄板成形性能影响的基础上,对已有的CuZn36黄铜薄板微拉伸实验结果进行处理,提出了一种研究微塑性成形本构关系的方法。根据弹性和塑性变形过程,分阶段分析了t/d(板厚/晶粒大小)对屈服强度和切线模量的影响,修正了双线性弹塑性本构关系,获得了考虑尺寸效应的微塑性成形本构关系。借鉴宏观增量本构关系,结合微拉伸实验,采用Mises屈服准则和随动强化模型,得出适合微塑性成形的弹塑性增量本构方程,为微塑性成形的理论研究和实际应用奠定了基础。Size effect makes most know-how of traditional macro-forming not suitable for the micro forming process. On the basis of the micro tension experiment of the CuZn36 sheet, the influence of t/d （thickness/ grain size） to yield stress and tangent modulus is investigated in this paper, and the constitutive relation consid- ered of the size effect is obtained by revising the double-linear elastic-plastic constitutive relation. Combined the incremental stress-strain relation in macro plastic mechanics and the results of micro tension, the elastic-plastic incremental constitutive equation suitable for the micro forming is established using Mises yield criterion and kinematic hardening model. The incremental method flow chart is presented which can be used for finite element analysis and practical application.

关 键 词：尺寸效应 微成形 塑性成形 本构关系 微拉伸 

分 类 号：TG306[金属学及工艺—金属压力加工]