第42卷第7期 Vol. 42No. 7
压技木
FORGING & STAMPING TECHNOLOGY
高伸长率QP钢在高应变速率下的力学特性
连昌伟12，陈新平1,2，俞宁峰1,2
2017年7月 Jul.2017
（1.宝山钢铁股份有限公司研究院，上海201900：2.汽车用钢开发与应用技术国家重点实验室（宝钢），上海201900）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，并与实际硅撞试验结果进行对比和验证。通过分析发现：QP钢其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钢幅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
关键词：QP钢：高速拉伸；动态力学特性：应变速率；本构模型 DOI: 10. 13330/j. issn. 1000-3940. 2017. 07. 031
中图分类号：TB302.3
文献标识码：A
文章编号：1000-3940（2017）07-0163-06
Mechanicalproperties onhighelongationsteel QPunderhigh strainrate
Lian Changwei'-2, Chen Xinping'-, Yu Ningfeng'-2(1. Research Institute of Baosteel, Shanghai 201900, China;
2. State Key Laboratory of Development and Application Technology of Automotive Steels ( Baosteel) , Shanghai 201900, China) Abstract: 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 dynamiec mechanical properties of steel QP. For hat-shape: beam made by QP980, its model was established by HyperWorks, and the axial erushing prooess 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 lin-ear 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. Key words : steel QP; high speed tensile; dynamic mechanical properties; strain rate; constitutive model
随着市场对汽车节能、环保、安全、舒适等要
收稿日期：20170601；修订日期：20170705 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 : lianchanguei@ baosteel. com +
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