疲労限度の統計的性質に基づく寸法効果の定量的評価 : S35C, SFA55炭素鋼およびAC8Aアルミ合金の回転曲げ疲労限度

概要

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To investigate the "size effect" of rotating bending fatigue test are carried out on solid bar specimens with various gage lengths, that is, the length of the parallel part, and the same cross section of S35C steel, SFA55 steel and AC8A aluminum alloy. Statistical test of significance about the effect of gage length on fatigue limit was carried out by using the mean and the standard deviation of fatigue limits obtained by an up-and-down method. The result of the statistical tests show that a significant difference exists among fatigue limits of each gage length. Experimental values of the size effect are coincide with the calculated value by means of the assumption that strength of micro defect in material belongs to Weibull distribution. In the experimental results, shape factor : m of Weibull distribution is 30〜80 and depends heavily on the material and metallurgical structure.
社団法人日本機械学会の論文
1999-11-25