Effect of Welding Residual Stress on Retardation Behavior due to Over-spike Loading During Fatigue Crack Propagation

Abstract

Although many studies concerning about retardation behaviors have been carried out, the effect of residual stress on retardation behavior have not yet been investigated. In the present study, SM50A steel weldments and SUS304 steel weldments were prepared to carried out the fatigue crack growth tests under constant amplitude loading with single over-spike loading. The effect of residual stress can be considered to be equivalent to that of mean stress. The mechanical model to predict delayed retardation behavior was also discussed. The proposed model gives a good agreement with experimental results.