S-N curve for crack initiation and an estimate of fatigue crack nucleus size

摘要

A study of fatigue life prediction was made for ASTM A533 Grade Bnuclear pressure vessel steel. The objectives of the study were to predict the S-N curve, representing crack initiation, and to estimate the average crack nucleeus size using an engineering approach. The plastic repica method was used to monitor crack initiation and growth from well-polished specimens under uniaxial tension-tesion stressing.