平面溶接欠陥を含む KAS 鋼 MIG 溶接継手の破壊靱性評価

概要

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The role of crack-like weld flaws has been studied on fracture toughness of welded structures. Tensile tests were conducted at low temperature with small size specimens taken from MIG welded joints of KAS steel including lack of penetration, surface flaw, embedded flaw or through thickness flaw. The main results are summarized as follows : (1) Critical J-values Jc obtained through Rice's equation depended on the flaw shape and flaw size for σ_<nc>>σ_Y and sensitively increased with increase of temperature when ρ_c>b (2) The relationships between Jc and critical elongation e^*_c were analytically led out and have been experimentally confirmed; [numerical formula] where σ_<nc> : fracture net stress, σ_Y : yield strength, ρ_c : critical length of plastic zone, b : ligament width, h : displacement, i_o : gauge length, 2a : crack length, e_Y : yield strain, B : specimen thickness and W : specimen width.
社団法人溶接学会の論文
1981-10-05