脆性破壊発生のクライテリアに関する考察

概要

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The current engineering fracture criteria K_c, Φ_c, and ω_c^+ for brittle fracture initiation are critically reviewed. analytically and experimentally. The followings are obtained conclusively : (1) The fracture initiation in existence of residual stress, say due to welding performance, pre-loading etc., is explained equally well by Φ_c or ω_c^+ criterion, but not by K_c criterion. (2) Φ_c criterion is refered to qualifying examination as a fracture criterion throughout the small & large scale yielding regions. It is confirmed that COD test on small specimen, can predict the fracture behaviour of large specimen or structural member. (3) The value of Φ_c is dependent on degree of triaxiality of stress or plastic constraint (notch acuity, plate thickness, structural constraint etc.) as well as temperature.
社団法人日本船舶海洋工学会の論文