Abstract
The R-S-N (Reliability-Stress-Life) curves of a specific material are the important information if reliability-based design method is to be applied on mechanical components. As the bilinear equations of conventional S-N curves cannot express the S-N relation properly for long fatigue life, the study employed nonlinear and irrational functions to construct the R-S-N curves covering all range of fatigue lives. Using three non-linear models (i. e. Weibull, Bastenaire and Serensen), the R-S-N curves for the surface fatigue strength of JIS SCM 415H are constructed based on the resulting data of a fatigue test. Finally, comparisons of these R-S-N curves and discussion of the differences among these models have been made.
