Effects of finite element type on springback simulation of a high strength steel sheet

Résumé

Effects of finite element type on springback simulation of a high strength steel sheet are investigated using isotropic and combined hardening models. Solid and shell elements are used to model a DP600 steel sheet and the differences in the stress field during a two-dimensional draw-bending process are examined. The amount of springback tends to decrease by taking kinematic hardening into account, but this trend tends to invert, i.e. the sprigback tends to increase, as the initial tensile stress is increased. This inversion arises at much lower initial tensile stress when shell element is used compared to solid element. Reasons of the difference shown between solid and shell elements are investigated in terms of evolutions and distributions of stress components.