Predicting FLCs of Hot Stamping Boron Steel by Z’-DFC 2019-01-1089
In this study, combined with an improved Zener-Hollomon parameter (Z’), a previously proposed ductile failure criterion (DFC) is used to predict forming limit curves (FLCs) of Boron steel at hot stamping temperatures. The ductile failure criterion takes into account the critical damage at localized necking or fracture as a function of strain path and initial sheet thickness. The improved Zener-Hollomon equation accounts for the strain rate sensitivity of the material at high temperatures. Compared with published experimental result, the criterion is able to provide accurate prediction of FLCs of different thick Boron sheet steel at different hot stamping temperatures.