Dynamic mechanical properties and constitutive model of DP980 steel
ZHANG Chun-ju1, DING Xuan1, YANG Ming-qiu2, ZHANG Lu-yang1, LI Hui1
1. College of Engineering, Yantai Nanshan University, Yantai 265713, Shandong, China; 2. Nanshan Nuantong New Material Co., Ltd., Yantai 265700, Shandong, China
Abstract:With the continuous development of automobile lightweight industry, advanced high strength DP steel has been rapidly developed and applied. The simulation of vehicle collision process safety puts forward an urgent demand for dynamic mechanical property data of DP steel. The tension mechanical properties under different strain rates of DP980 steel were investigated using universal tensile testing machine and high-speed tensile testing machine in this paper. The dynamic constitution mathematical model based on JC model was established. The model calculation results were compared with the experimental data. The results indicate that the yield strength and tension strength are relatively stable under the strain rates of 10-4-10-2 s-1, which fluctuates in the range of 660-675 and 1 030-1 050 MPa respectively, while increases with the increasing of strain rates under the strains rates of 10-1-103 s-1. When the strain rate increases from 10-1 to 103 s-1,the yield strength increases from 690 to 810 MPa,while the tension strength increases from 1 050 to 1 200 MPa. The uniform elongation and breaking elongation are 11% and 16% respectively under the strain rates of 10-4-10-1 s-1. The elongation increases first and then decreases with the increasing of strain rates under high strain rates, and reaches the peak value of 25% under the strain rate of 500 s-1. DP980 steel has obvious strain rate sensitivity. The simulation results under the strain rates of 101 and 102 s-1based on the dynamic constitutive model have great agreement with the experimental results. Dynamic mechanical property data is the key factor affecting the reliability of vehicle collision simulation results. The dynamic mechanical property evolution law of DP980 steel and the corresponding dynamic JC constitutive model studied in this paper can more conveniently provide accurate data support for automobile plants, shorten the experimental time, reduce the experimental cost, and improve the reliability of simulation results of automobile collision process.
张春菊, 丁轩, 杨明球, 张陆洋, 李辉. DP980钢的动态力学性能及本构模型构建[J]. 钢铁, 2022, 57(2): 157-161.
ZHANG Chun-ju, DING Xuan, YANG Ming-qiu, ZHANG Lu-yang, LI Hui. Dynamic mechanical properties and constitutive model of DP980 steel[J]. Iron and Steel, 2022, 57(2): 157-161.
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