Transactions of Materials and Heat Treatment

Title：Dynamic mechanical properties of medium carbon low alloy steel and improvement of J-C constitutive model under impact load

Authors： Huang Dongying Xu Liang Liu Xiaohong

Unit： Guangxi University Liuzhou Liuxin Auto Stamping Co. Ltd.

KeyWords： medium carbon low alloy steel dynamic mechanical properties J-C constitutive model impact compression strain rate effect

ClassificationCode：TG156

year,vol(issue):pagenumber：2021,46(11):225-230

Abstract：

he quasi-static tensile tests and impact compression tests under different strain rates at room temperature were carried out on quenched and high-temperature tempered medium carbon low-alloy steel, and it is found that the material has obvious strain rate sensitive effect and plasticizing effect. In order to establish a constitutive model, which could truly reflect the plastic deformation characteristics of medium carbon low alloy steel under strong impact load, the traditional Johnson-Cook (J-C) constitutive model was revised by adding the thermal softening term of adiabatic temperature rise（ATR）and modifying the strain rate sensitive coefficient, and the model parameters were solved by multi-variable linear fitting and genetic algorithm (GA). The research shows that the results of the improved J-C constitutive model are in good agreement with the experimental results under different strain rates, and the improved J-C constitutive model well describes the mechanical behavior of medium carbon low alloy steel under dynamic impact load, which provides theoretical reference for the use of numerical simulation method in engineering to study the dynamic mechanical behavior of medium carbon low alloy steel.

Funds：

广西大学有色金属及特色材料加工重点实验室开放基金（2020GXYSOF14）

作者简介：黄东英（1994-），女，硕士研究生，E-mail：1811301007@st.gxu.edu.cn；通信作者：刘晓红（1980-），女，硕士，副教授，硕士生导师，E-mail：liuxiaohong@gxu.edu.cn

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