Transactions of Materials and Heat Treatment

Title：Mechanical properties on high elongation steel QP under high strain rate

Authors： Lian Changwei Chen Xinping Yu Ningfeng

Unit： Research Institute of Baosteel State Key Laboratory of Development and Application Technology of Automotive Steels (Baosteel)

KeyWords： steel QP high speed tensile dynamic mechanical properties strain rate constitutive model

ClassificationCode：TB302.3

year,vol(issue):pagenumber：2017,42(7):163-168

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 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.

Funds：

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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