Proposal of a New Analytical Model for Fatigue Data Based on Distribution of Fatigue Strength

A number of fitting methods for fatigue strength data have been proposed to evaluate the fatigue characteristics quantitatively. It is, however, still unknown what is the best method for estimating the fatigue strength or the fatigue life of materials. This paper was focused on the review on the conventional fitting methods, and discussion on the model validity. Furthermore, a new fitting technique was proposed to analyze the database which included the S-N data under various stress ratios. It was finally found that the method proposed in this study was applicable to all the data stored in the JSMS fatigue database, and was more effective in fitting the fatigue data than the conventional fitting methods.