Fatigue Test by Staircase Method with Small Samples

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  • Staircase法による疲れ試験 : 試験片の数が少ない場合
  • Staircaseホウ ニ ヨル ツカレ シケン

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Abstract

Among the statistical methods for obtaining the endurance limit in the fatigue test, "probit" technique and "staircase method" are well known. When the fatigue test is performed by these methods, a great number of specimens are required. In this report the fatigue test by staircase method with small samples is presented and the accuracy of this method is discussed. The fatigue strength S at fixed stress cycle N is obtained by this method. Such values of S at several values of N are plotted in the S-N graph, and then the S-N curve can be drawn. First, the distribution of the sample mean obtained by this method is considered, where the size of sample is 4. The influence of the step size on the variance of the sample mean is discussed. Next certain experiments were performed on 0.35% carbon steel. The values of S at five values of N were obtained by this method on each one of the 4 specimens. The S-N curve drawn by this procedure was found to coincide with that drawn by other method.

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