NUMERICAL SIMULATION OF BENDING PROCESS FOR STEEL SHEETS USED IN AUTOMOTIVE INDUSTRY WITH EMPHASIS ON SPRINGBACK

This study examines the influence of material models employed in FE simulations on springback prediction for various steels. The goal is to contribute to the understanding of springback prediction for steels commonly used in automotive manufacturing. In this paper, the springback behavior of TRIP, HSLA, and EDDQ steels following a V -bending operation with a 90(degrees) bend angle was analyzed. Numerical simulations utilize both the Hill48 and Barlat89 yield criteria, combined with the Ludwik and Swift hardening models The simulation data against results obtained from physical experiments were compared and evaluated. The obtained experimental findings demonstrate a correlation between springback and mechanical properties, with yield strength playing a significant role. Higher values of yield strength harm the final angle of the bent part, thus increasing the springback of the part. The numerical results of the springback were not identical to the experimentally achieved springback values in most cases. Particularly, when Swift hardening model was used in the simulation.