New data analysis of probabilistic stress-life (P–S–N) curve and its application for structural materials

摘要: Abstract Conventional S – N fatigue curves, the so-called Wohler curves are generally considered as experimental life plots for several stress amplitudes. The usually expressed median ranks and each distribution is supposed to follow log-normal distributions. Therefore, it can be said that not enough work on theoretical relationship between distributions curve exists till today. This paper unveils a new data analysis method probabilistic stress-life ( P ) curve. It was used define physical meaning of statistical parameters in Weibull lognormal function well At first, applied conventional test results bearing steel (no limit) rail (showing literature. material showing no limit log–log (not semi-log) straight line plot, but materials plot an asymptote any probabilities failure. Following this, alternating torsion two series through hardened steels were examined. three-parameter fit fairy materials. No observed both projected onto curves; formulas successively conducted.