基于J-C模型的Q235钢的动态本构关系

摘要

采用万能材料试验机、分离式霍普金森压杆和拉杆系统,研究了 Q235钢在常温至900 ℃的准静态和动态压缩及拉伸力学性能.基于实验结果,修正了 Johnson-Cook(J-C)本构模型中的温度软化项,提出了 Q235钢的修正J-C本构模型,并利用Taylor撞击实验和数值仿真验证了其动态本构关系.%In this paper, we studied the quasi-static performance and the dynamic compression and tensile properties of the Q235 steel at temperatures ranging from the room temperature to 900 ℃ using a universal testing machine and the split Hopkinson bar system. Based on the experimental results, we modified the thermal softening item in the Johnson-Cook (J-C) constitutive model and proposed a revised J-C constitutive model for Q235 steel, which we then validated using Taylor impact experiments and corresponding numerical simulations.