Abstract
Recently, high-strength steels are widely used in automobile industry for the weight reduction of car body. The high-strength steels have low ductility, it sometimes causes the cracking during press process. In the present study, we investigated the simple specimen shape for the calibration of Extended Mohr Coulomb fracture model. Three types of specimen based on JIS-5 specimens were modeled and the relationship between stress triaxiality and equivalent plastic strain were calculated by Finite Element Analyses. It is conclued that the specimen with hole have bi-axial stress state and it can be used for the calibration of bi-axial stress condition. However, the specimen with notch did not have shear stress condition.
