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Online ISSN : 1348-1479
Print ISSN : 0385-6917
ISSN-L : 0385-6917
論文
人工欠陥を有する高強度鋼の片振りねじり疲労特性
早川 守寺本 真也小澤 修司根石 豊牧野 泰三
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2018 年 2018 巻 63 号 p. 5-11

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In this paper, torsional fatigue tests of high strength spring steel were conducted for bar-shaped specimens with artificial small defects of various sizes at a stress ratio of R=0.1. The shear fatigue limit decreased with the increase in defect size. The relationship between fatigue limit and the square root of the projected area of the defect was evaluated. The relationship was defined by El Haddad’s short crack correlation substituting an intrinsic defect size for an intrinsic crack depth. The relationship was characterized by the approximate formulation using the parameter; thus, the fatigue limit with a small defect can be accurately estimated by the parameter.

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