The International Journal of Advanced Manufacturing Technology | 2021
Finite element analysis on electromagnetic forming of DP780 high-strength steel sheets
Abstract
In this paper, the effects of strain rate on the mechanical properties of DP780 were analyzed by quasi-static tensile test and Hopkinson bar test; Johnson-Cook constitutive model with high strain rate was established. Based on ANSYS/LS-DYNA finite element program, the finite element simulation of electromagnetic forming process of high-strength steel sheet under the action of driving plate was realized, and the influence of various process parameters on the forming height was studied. The results showed that the yield strength and ultimate tensile strength of the material increased with high strain rate, and DP780 high-strength steel had certain strain rate sensitivity. The drive sheet receives the maximum magnetic field force near the outermost two-turn coil. The deformation of high-strength steel plate mainly occurs under the action of impact inertia. The peak forming height increases with the rise of discharge frequency. The increase of the thickness of the drive sheet can reduce the forming efficiency.