双相钢DP600塑性率相关效应试验及本构模型  

Plastic Rate-Dependent Experiment and Constitutive Model for Dual Phase Steel 600

作　　者：余海东[1] 郭永进[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》2009年第10期1672-1675,1680,共5页Journal of Shanghai Jiaotong University

基　　金：国家重点基础研究发展规划(973)项目(2007CB714003);高等学校博士学科点专项科研基金资助项目(200802481113)

摘　　要：考虑汽车在碰撞过程中具有明显的高应变率特性,对双相钢DP600在应变率10-4~103s-1进行拉伸试验,讨论不同应变率下材料塑性特性与应变率之间的关系.基于试验结果,对John-son-Cook模型进行讨论和修正,建立了适用于双相钢材料的塑性特性的本构模型,并给出参数确定方法;通过用户子程序VUMAT与商用软件接口,验证模型的有效性.结果表明,建立的本构模型可以准确地描述材料的塑性率相关特性,能够应用于汽车的碰撞安全数值仿真分析.The uniaxial quasi-static and dynamic tensile tests at strain rates ranging from 10^-4 to 10^3 s^-1 were performed to discuss the correlation between the plastic behavior and the strain rates. Based on the experimental data, the plastic behavior for the Johnson-Cook model were discussed and modified to describe the plastic constitutive behavior for DP600. The determination method of the parameters in the modified Johnson-Cook model was given. By using the user subroutine VUMAT in the commercial finite element software, the validity of the model was verified. The results show that the new plastic rate-dependent constitutive model can describe the plastic behavior on DP600 excellently, which can be used in the crashworthiness simulation of the automobiles.

关 键 词：双相钢 率相关 塑性硬化率 本构模型 

分 类 号：O344[理学—固体力学]