鋼の耐久限度近傍における疲労寿命に及ぼす結晶粒径効果の統計的検討(<小特集>信頼性工学小特集)

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Although fatigue life distributions are often represented by the Weibull distribution with three parameters, the properties of these parameters have not been clarified. In this study, the fatigue tests were conducted on JIS S 35 C steels with two different grain sizes at stress levels near each fatigue limit by using a Wohler type fatigue testing machine. The property of each parameter in Weibull type representation was discussed from the viewpoints of its dependency on the grain size and microscopic observations. The value of the scale parameter was larger for the material with larger grain size. The value of the shape parameter was roughly proportional to the applied stress for the material with larger grain size, while it was almost constant independently of the applied stress for the material with smaller grain size. From the microscopic observations of the crack growth behavior, it was suggested that the value of the location parameter might correspond to the number of stress cycles where the transition from stage I type crack to stage II type takes place. At stress levels near the fatigue limit of each material, the relationship between the applied stress σ and the fracture probability P_f could be approximated by the following linear equation, P_f = Aσ+B where A and B were material constants and A increased as the grain size became larger. The evaluation of the safety factor was discussed on the basis of the above relation.
社団法人日本材料学会の論文
1982-12-15

鋼の耐久限度近傍における疲労寿命に及ぼす結晶粒径効果の統計的検討(<小特集>信頼性工学小特集)

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