SEDL / STP / STP744-EB / STP29329S

Statistical Fatigue Properties of Some Heat-Treated Steels for Machine Structural Use

Nishijima, S
Head, First Laboratory, Fatigue Testing Division, National Research Institute for Metals, Tokyo,

Pages: 14    Published: Jan 1981

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Abstract

A practical method for establishing the P-S-N diagram is proposed. The method is essentially based on consideration of the distribution of strength deviation values for individual test data determined against the mean S-N curve of the population. Thus an S-N curve for 1 percent failure probability can be derived from the fatigue test results using 100 specimens.

A series of statistically planned fatigue tests was conducted according to the proposed method, in order to obtain basic fatigue data about different materials most commonly used in mechanical industries. This paper deals with the results for some typical carbon and low-alloy steels with different heat treatments, the tests being on smooth specimens in rotating bending, and discusses the variation in statistical properties between materials.