Evaluation of Blunting Line and Elastic-Plastic Fracture Toughness
SourceThe Japan Society of Mechanical Engineers (JSME) has made an effort towards standardization of the JIc test method. The recommended procedure includes two multiple-specimen methods [obtained at the intersections of the experimentally determined J-stretched zone width (SZW) blunting line and the R-curve, and of the J-SZW blunting line and the critical stretched zone width (SZWc)] and three single-specimen methods (ultrasonic, electrical potential, and acoustic emission). Concerning the blunting line and the R-curve, many experimental data have been accumulated by the present authors in recent years.
In this paper, the evaluation method of the blunting line and of the R-curve and their application to the JIc test are discussed with special attention to a comparison between two methods recommended by JSME and the American Society for Testing and Materials.