锻压技术

高伸长率QP钢在高应变速率下的力学特性

英文标题：Mechanical properties on high elongation steel QP under high strain rate

作者：连昌伟陈新平俞宁峰

分类号：TB302.3

出版年,卷(期):页码：2017,42(7):163-168

摘要：

为研究高伸长率QP钢的动态力学特性，以两种强度级别的QP钢为研究对象，进行准静态和高应变速率下的单向拉伸试验，得到了不同应变速率下的应力-应变曲线。通过对试验数据的分析，研究了应力与应变速率的关系，并提出动态本构模型来描述QP钢的动态力学特性。基于QP980制作的帽型梁零件，使用HyperWorks进行建模，使用LS-DYNA进行模拟轴向压溃过程的计算，并与实际碰撞试验结果进行对比和验证。通过分析发现：QP钢具有明显的应变速率效应，而且应变速率硬化与相对应变速率不呈线性关系。QP钢帽形梁碰撞试验与仿真对比表明，使用修正的Johnson-Cook模型能较好地描述QP钢在不同应变速率下的动态力学特性。

In order to investigate mechanical properties of high elongation steel QP under dynamic load, for two different levels of steel QP, the uniaxial tensile test was conducted under conditions of quasi-static and high strain rate, and strain-stress curves under different strain rates were obtained. Through the analysis of experimental data, the relationship between stress and strain rate was studied, and a dynamic constitutive model was proposed to describe the dynamic mechanical properties of steel QP. For hat-shape beam made by QP980, its model was established by HyperWorks, and the axial crushing process was simulated by LS-DYNA. Then, simulation results and actual collision test results were compared and verified. It is found that steel QP has a strain rate effect obviously, and the strain rate hardening is not in linear relationship with the relative strain rate. According to the comparison of axial crushing test and numerical simulation for hat-shape beam, the dynamic mechanical properties of steel QP under different strain rates are well described by the modified John-Cook model.

基金项目：

国家重点研发计划课题(2016YFB0101605)

作者简介：连昌伟（1982-），男，硕士，工程师，E-mail：lianchangwei@baosteel.com

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