Statistical Study of overstressing in steel

Note presenting a study of the effect of overstressing on the fatigue properties of SAE 4340 steel. The effect of microstructure on the susceptibility to reduction in fatigue life due to cycles of overstress was investigated. Results regarding the effect of microstructure on overstressing damage, influence of criterion of failure on fatigue life, and effect of overstressing on endurance-limit statistics are provided.