Abstract
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(Kc(J)/σys)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.
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