A method for fatigue life prediction of notched specimen or real component when taking the effects of mean stress

stress gradient and dimensional size into consideration was developed based on the distribution of dimensionless stress at notch root of the specimen.The factors for stress gradient and dimensional size were calculated and the fatigue life was predicted for two types of notches machined with TC4 alloy.The results show that mean stress at notch root and the factors for stress gradient and dimensional size could reflect the effects of notch on the fatigue life.Predictions based on the developed approach give estimates falling within 2-fold scatter.