延性-脆性遷移温度領域における平面ひずみ破壊靭性の評価に関する研究 : 第2報, へき開き裂発生点と破壊靱性値の板厚依存性

概要

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The fracture toughness test for specimens of various thicknesses is performed in the ductile-brittle transition temperature region. The statistical property of cleavage fracture toughness, and effect of thickness on the cleavage crack initiation point are investigated systematically. The following are the main results obtained in this study. (1) Cleavage cracks initiated at a certain distance (S') from the surface of specimens. (2) It is possible to determine the plane-strain region from the analysis of the cleavage crack initiation point. (3) The plane-strain condition at the center of the specimen is given by the following equation: B≧0.004(K_c(J)/σ_<ys>)^2+0.01. (4) The thickness effect of cleavage fracture toughness occurs with a statistical distribution of the weakest point ahead of the crack front.
社団法人日本機械学会の論文
1991-12-25