J-Integral Elastic-Plastic Fracture Mechanics Technology in the U.S. Navy

摘要

The United States Navy has historically been interested in the development of fracture safe materials for ship construction, and in developing fracture mechanics criteria for design considerations. Recently, a substantial research effort has been directed to the development of J-Integral technology. The purpose of this presentation is to review recent Navy advances in this area. The main points will include a discussion of the applicability of the J-Integral to fracture in ductile materials, the development of test procedures for JIc, recent results in the areas of J-controlled crack growth, dynamic J-Integral properties, and instability criteria based on the JI versus crack growth resistance curve.