SM 50B 突合せ溶接継手の疲れ特性におよぼす寸法・速度効果 : 金材技研における溶接継手の疲れデータシートについて(第 1 報)

概要

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In Fatigue Branch of National Research Institute for Metals, the experimental program had been carried out from 1975 for standardizing the axial fatigue testing method in order to make the fatigue data sheets on weldments of the domestic metallic structural materials. In this program, the following basic factors were investigated; (1) the effect of the specimen size, (2) the effect of frequency, (3) the effect of testing machine. Materials used in this program were the rolled steel for welded structure, SM50B, SM58Q and HT80,and the type of joint were the butt welded joint with reinforcement and the non-load carring fillet welded joint. Fatigue test was carring out under an axial loading condition with the stress ratio of zero using the strip-type specimens. In this report, the above factors were investigated about SM50B butt welded joint. And it was found that the difference of thickness (from 9mm to 40mm) has remarkable effect on the fatigue strength which is unexplainable only by the static strength and that this effect seems to be mainly caused by the difference of the stress concentration due to the shapes of reinforcement for each thickness. Also, it had been observed that those factors of the specimen width (from 25mm to 160mm), frequency (from 1Hz to 100Hz) and testing machine have no significant effect on the fatigue strength.
社団法人溶接学会の論文
1978-09-05