The application of some criteria for ductile fracture to the prediction of the forming limit of sheet metals

The possibility of the application of ductile fracture criteria to the formability prediction of sheet metals is examined. Some criteria in simple forms are employed and combined with the finite element simulation of sheet metal forming. From the calculated histories of stress and strain in each element, the fracture initiation site and the forming limit are predicted by means of the criteria for ductile fracture. The material constants in the...