疲勞界限決定に關する一方法

概要

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The author proposes a method of determining the fatigue limit of steel by measuring the width of the mechanical hysteresis loops after the material has been subjected to repeated bending stresses of increasing magnitude. The author finds that up to a certain amount of stress the width of the hysteresis loops is practically zero after which it increases gradually. Thus the relation between the width of hysteresis loops (b) and the maximum stress induced (s) is represented by the formula as follows : - [numerical formula] , where A, B, and m are emperical constants. From the intersection of the curve represented by the above formula upon the stress-axis the value of the fatigue limit (s_0) can be determined. The value determined in this way is lower than that found by the S〜N diagrm method. In the author's opinion this difference will depend on the results from the S〜N diagram method which, in actual practice, will give higher values than true values. The author also discusses the effect of the number of repetion and vibration on the width of hysteresis loops in the article.
一般社団法人日本機械学会の論文
1928-07-20