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The JIc testing procedures proposed by the American Society for Testing and Materials (ASTM) and the Japan Society of Mechanical Engineers (JSME) were evaluated using medium-strength heat-treated steels. Among the three multiple-specimen methods investigated, the ASTM R-curve method generally gave the largest JIc-values, while the JSME R-curve method provided the smallest values. The JSME stretched zone width (SZW) method, which was developed with emphasis on accurate identification of the initiation of ductile tearing, yielded relatively high toughness values that were rather close to those by the ASTM method. The ASTM method provided a relatively stable procedure for toughness determination and yielded values higher than that at the onset of ductile tearing for these materials. The JSME R-curve method seemed to give the values closest to the onset of ductile tearing among the three methods investigated. The JSME SZW method showed sensitivity to interpretation and definition of the critical values of SZW. Development of a stable procedure for determining the critical SZW values may be of primary importance for improving reliability of the JSME SZW method.
J, Ic, testing, elastic-plastic fracture toughness, J-integral, R-curve method, stretched zone, stretched zone width method, evaluation, standard, round-robin test, medium-strength steel, heat-treated steel, elastic-plastic fracture
Professor, Osaka University, Yamada-oka, Suita,
Professor, Nagoya University, Chikusa-ku, Nagoya,
Associate Professor, Tokyo Institute of Technology, Meguro-ku, Tokyo,