数種類の鋼のJ_<IC>試験におけるき裂発生点の電位差法による評価

概要

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A method of evaluating the elastic-plastic fracture toughness (J_<I_C>) by means of the electric potential technique wad developed. The relationship between J integral and electric potential was used, in which the data in the blunting and the stable crack growth processes were approximated by respective best-fitted lines. The onset of ductile tear cracking was defined by the intersection of these two lines. A procedure of optimizing detectability of the intersection was proposed. The J_<I_C> values of several high- and medium- strength steels were determined by this method. The J_<I_C> values thus obtained were compatible with those determined by the JSME R-curve method. The use of side-grooved specimens improved remarkably the detectablility of crack initiation of low-strength high-toughness steels by the electric potential technique. The present thickness requirement imposed on the JMSE standard. J_<I_C> test specimens may be relaxed when properly side-grooved specimens were employed.
一般社団法人日本機械学会の論文
1984-02-25