耦合TRIP效应的TRIP型多相钢本构模型及其在冲压中的应用  

A Constitutive Model Coupling with TRIP Effect and Applying to the Sheet Metal Forming for TRIP Multi-phase Steels

作　　者：单体坤[1] 张卫刚[1] 李淑慧[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《上海交通大学学报》2008年第1期73-77,共5页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金资助项目(50405015);上海市重大基础性研究项目(06dj14005)

摘　　要：提出了一个耦合TRIP(Transformation Induced Plasticity)效应和考虑材料各向异性的TRIP型多相钢的本构模型.TRIP效应通过与应力状态和塑性应变相关的马氏体动力学方程来描述.把所建立的TRIP钢本构模型在商业有限元软件中进行二次开发,对TRIP型多相钢的应力应变关系和成形性能进行了仿真计算,仿真结果与实验结果符合很好.由于TRIP效应减小了材料的弹性模量,因此在回弹仿真中考虑到弹性模量变化来提高回弹预测的精度,与传统的认为弹性模量在成形过程中保持不变的仿真结果相比,所建立的模型能够很好地说明TRIP钢回弹大的主要原因,为提高TRIP钢的成形性能和精度打下了理论基础.This paper presented a methodology for constitutive model construction of the multi-phase steel coupling with TRIP （transformation induced plasticity） effect and anisotropy characters. The TRIP effect is described by the evolution of phase transition which is dependent on stress state. The proposed constitutive model is implemented into the commercial FE code to obtain a stress-strain curve of TRIP steel and predict the martensitic transformation at different regions of the cup deep drawing parts, which corresponds well with the experimental results. The variation of the elastic modulus with the martensitic transformation during stamping is also considered to improve the accuracy of springback simulation for TRIP steel. The results above present a foundation for the formability control technology.

关 键 词：相变诱发塑性钢 本构方程 相变诱发塑性效应 板料成形 回弹 

分 类 号：TG142[一般工业技术—材料科学与工程]