炭素鋼および高張力鋼突合せ溶接継手の曲げ疲労強度に及ぼす応力比の影響

概要

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This paper is concerned with the effect of stress ratio on the fatigue strength of butt-welded joints made by two kinds of steels (0.18 C steel and 780 MPa high strength steel). The effect of mean stress on the fatigue strength of welded joints depends on the type of steel and the value of a notch root radius at the weld toe. The fatigue strength of a welded joint with a small notch root radius at the weld toe is remarkably influenced by the mean stress. In this case, the fatigue limit of the welded joint increases when the positive mean stress changes into the negative. The fatigue strength of a welded joint with a large notch root radius at the weld toe is a little affected by the mean stress. The benefitial effect of TIG treatment on the fatigue strength is more remarkable at the stress ratio R=0 than at R=-1 and also more remarkable in 780 MPa high strength steel than in 0.18 C steel. These phenomena are closely related to the value of p, which is the value of p at the branch point and the material constant depending on both the type of steel and the stress ratio.
社団法人日本材料学会の論文
1992-10-15