A Statistical Analysis on Fatigue Life Distribution in Spheroidal Graphite Cast Iron

구상흑연주철의 피로수명분포에 대한 통계적 해석

Jang, Seong-Su;Kim, Sang-Tae

  • Published : 2000.09.01


Statistical fatigue properties of metallic materials are increasingly required for reliability design purpose. In this study, static and fatigue tests were conducted and the normal, log-normal, two -parameter Weibull distributions at the 5% significance level are compared using the Kolmogorov-Smirnov goodness-of-fit test. Parameter estimation were compared with experimental results using the maximum likelihood method and least square method. It is found that two-parameter Weibull distribution and maximum likelihood method provide a good fit for static and fatigue life data. Therefore, it is applicable to the static and fatigue life analysis of the spheroidal graphite cast iron. The P-S-N curves were evaluated using log-normal distribution, which showed fatigue life behavior very well.


P-S-N Curve;Probability Paper;Scale Parameter;Lognormal Distribution;Weibull Distribution Function;Spheroidal Graphite Cast Iron;Reliability


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