Abstract
A crack becomes stationary during blanking when the clearance between the punch and the die is relatively small. In this work, a simulation of the stationary crack during blanking was performed using the node separation method. When a crack becomes stationary, one fracture surface contacts another fracture surface in the region near the stationary crack. Therefore, a simplified simulation method is proposed for the material contact. Special attention was paid to the effect of the various kinds of ductile fracture criteria on crack initiation and crack propagation during blanking. The shapes of chips and holes and the relationship between punch displacement and punch force calculated from the simulation agree well with those obtained experimentally.