NUMERICAL SIMULATION OF BENDING STEELS USED IN AUTOMOTIVE INDUSTRY WITH EMPHASIS ON SPRINGBACK

Abstract

In this work, the influence of material models used in the FE simulation on the springback prediction of various steels is investigated. The aim of this work is to extend the knowledge base regarding springback prediction of steels used in car production. The springback effect after V-bending operation was studied on TRIP, HSLA and EDDQ steels. The bending angle was set to 90°.  In the numerical simulation, Hill48 and Barlat yield criteria were used in combination with Ludwik's and Swift's hardening models. Achieved data from the numerical simulations were compared and evaluated with experimental test results. The experimental results showed the relation between springback and mechanical properties, mainly the yield strength. Higher values of yield strength have negative impact on the final angle of the bent part, thus increasing springback of the part. The numerical results of the springback were not identical with the experimentally achieved springback values in most cases. Particularly, when Swift yield criterion was used in the simulation.