熱影響部に軟化域を有する溶接継手部の疲労特性について

概要

論文の詳細を見る
TMCP type 50kgf/mm^2-calss high-tensile steel plates are widely used in large-size welded structures. As it is welded, the TMCP steel plate is allowed to softened area developed at its heat affected zone, where its static strength is lower than that of the base metal. The authors had reported that a TMCP steel plate with a carbon equivalent below 0.35 to 0.4% develops the softened area at its weld heat affected zone, and that the wide welded joint with the softened area has the tensile strength the same as that of the base metal. Moreover, it had became clear from a design viewpoint that the fatigue strength of the welded joint with the softened area is almost the same as that of the welded joint free of the softened area. We had investigated notch sensitivity of a softened area to the base metal and the propagation behavior of fatigue crack propagates through the softened area of the welded joint. The results had showed that the softened area has the lowered notch sensitivity than the base metal and that the propagation rate of fatigue crack goes down or suspend for a while at the softened area.
社団法人日本船舶海洋工学会の論文
1995-09-04