Distributions of Strength in Simple Fatigue and The Associated Reliabilities

A method for determining fatigue strength distributions at specific cycles of finite life, given cycles-to-failure data, is presented and applied to steel and aluminum wire fatigue data. Methods for calculating the reliability designed into a part for a specified cycle of finite life are given and are illustrated for the cases when the level of the maximum alternating operating stress is kept essentially constant, or has a normal or a Weibull distribution.