Abstract: Quasi-static and dynamic tensile tests are carried out on alloyed galvanized deep drawing steel sheet for automobile (DC53D+ZF) to investigate its tensile mechanical behavior under different strain rates. Stress-strain relationships are obtained in strain rate range of 0～500 s–1. Johnson-Cook constitutive model of the steel is derived from the experiment results. Model without considering strain rate, Johnson-Cook, Cowper-Symonds model and experiment data are compared by simulation model of rectangular cross section beam collision. The results show that the J-C constitutive model derived is in good agreement with the test results, which proves the parameters obtained can well describe the dynamic deformation behavior of DC53D+ZF under high strain rate.

Key words: Collision, Dynamic tensile, Johnson-Cook constitutive model, Simulation, Strain rate