Reliability Analysis on S-N Evaluation Model

Abstract

It has been shown from the results of round robin tests conducted under VAMAS project that the fatigue property may vary from one researcher to another due to the difference of evaluation models used. It is important to clarify the effect of the S-N evaluation model used on the reliability analysis. In this paper, the fatigue data are fitted to five regression models and the goodness of fit is investigated. The fatigue data are picked from the fatigue database which was provided by JSMS. No significant difference could be found concerning the goodness of fit against the models. However, the results differed slightly depending on the factor used in the goodness of fit. Moreover, the effect of the model on the evaluated fatigue life is investigated for the fatigue under random loads. The fatigue life evaluation was formulated for three regression models and the fatigue life under various rms values was calculated for several materials. The effect of the fatigue model on the evaluation life was clarified.