Transactions of Materials and Heat Treatment

Title：Analysis on dynamic mechanical properties of high strength steel based on thin-walled beam crushing

Authors： Zhang Wei Li Chunguang Yang Jianwei Liu Lixian Wang Yanchao Zhu Hongya

Unit： Shougang Group Co. Ltd. Research Institute of Technology

KeyWords： high strength steel dynamic mechanical properties constitutive model strain rate crushing thin-walled beam

ClassificationCode：U465.1+1

year,vol(issue):pagenumber：2017,42(10):174-179

Abstract：

Advanced high strength steel has important influence on automobile safety and light weight, and its dynamic mechanical performance directly affects vehicle crash safety. For dual-phase high strength steel HC500/DP780, the dynamic mechanical properties of advanced high strength steel of automobile were analyzed, and the mechanical properties of uniaxial tensile tests were obtained by ordinary mechanical tensile tester and hydraulic servo high speed tensile testing machine under two kinds of quasi-static conditions of 0.001 s-1 and 0.1 s-1 and six kinds of high strain rates 1, 10, 100, 200, 500, 1000 s-1. Then, the constitutive model of material dynamic mechanical properties was obtained by the Johnson-Cook equation. Furthermore, based on the analysis of crushing performance for the thin-walled beam, the simulation analysis was conducted by software LS-DYNA, and the material dynamic mechanical properties and constitutive model were verified. The results show that the simulation results are in good agreement with the experimental analysis, which indicates the accuracy of the model simulation as well as the accuracy of material dynamic mechanical properties and constitutive model. With the increasing of the collision rate, the energy absorption ratio and the load ratio of pipe are all reduced. The above results illustrate that the collision rate of pipe has a certain impact on the energy absorption characteristics, and the energy absorption characteristics of pipe are gradually reduced with the increasing of collision rate.

Funds：

作者简介：张伟（1986-），男，博士，工程师，E-mail：zhangw@shougang.com.cn

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