曲げと引張を受ける貫通欠陥の疲労き裂伝播速度と脆性破壊発生について

概要

論文の詳細を見る
In many structural members, out-of plane stress due to bending and in-plane stress due to extension act at the same time. In the present paper, the characteristics for fatigue crack propagation and brittle fracture initiation from a through thickness crack in a plate under arbitrary combined extension and bending are analysed theoretically using ρ^+-concept. Considering the stress balance within the plate thickness, the authors defined effective tensile plastic zone size (ρ^+_<eff>) or effective stress intensity factor (K_<eff>) as a criterion of brittle fracture initiation and fatigue crack propagation. The effectiveness of this criterion were confirmed by brittle fracture initiation tests and fatigue crackk propagation tests.
社団法人日本船舶海洋工学会の論文