Proposal of Local Failure Evaluation Method in Creep Region and Study of Applicability

Abstract

According to the structural design codes of nuclear components, a ductile fracture is assumed as the failure mode due to internal pressure in the elastic-plastic region. It is known that the failure mode called local failure can occur at the structural discontinuity with high stress triaxiality field. In the past paper, authors have proposed a fracture surface in elastic-plastic region that can continuously evaluate the transition of failure modes from the ductile fracture to the local failure. This paper extends the fracture surface to the creep region from the elastic-plastic region and validates its applicability to actual structures.