Parameter Test and Numerical Simulation of Dynamic Constitutive Model for 08F Steel

Abstract

The dynamic compressive mechanical properties of 08F steel are numerically simulated by using quasi-static test and split Hopkinson pressure bar (SHPB) system, in order to improve the accuracy of finite element simulations in pulse shaper. The yield strength and Young's modulus of the material are determined by quasi-static compression test at the strain rate of 10-3s-1 the specimen size was Φ5 mm × 5 mm. The strain rate effect of the material is determined by split Hopkinson pressure bar (SHPB) system at the strain rates of 102 S-1 and 103 s-1, The Johnson-cook constitutive model parameters of 08F steel are analyzed and determined. PAM-CRASH is used to do numerical simulations with the deformation effect of 08F steel under four impact conditions. Compared with the actual test results, the numerically simulated results show that Johnson-cook constitutive simulation is suitable for the simulation of impact process of pulse shaper of 08F steel, which has obvious strain hardening property and strain rate sensitivity. The dynamic stress-strain curves is regressed based on the test results, which can be used as a reference for relevant research.