Tatsu Fujita

Unstable Fracture Criteria Under Large Plastic Deformation

Publisher Summary If fracture occurs between the yield point and the load predicted by the ultimate tensile strength, then neither the linear fracture mechanics is any longer applicable nor any other conventional fracture criteria. This chapter presents an investigation concerned with unstable ductile fracture criteria, which would complete a whole fracture concept along with linear fracture mechanics. In this study, a crack length is limited to be (a) not so large as the plastic region does not cover entirely the test piece and (b) not so small as a local necking takes place, providing a unfirom uniaxial plastic condition. The chapter presents the model for investigating the unstable fracture criterion.