Improvement of Bending Fatigue Limit by Cavitation Peening for Specimens Containing an Artificial Surface Defect

Abstract

It is well known that surface defects are decreased the fatigue strength. The cavitation peening method is in the limelight as a new possible surface refining method, which is a shot-less peening method and increases compressive residual stress. On studying the effects of the cavitation peening to the defects, the authors conducted an experiment using the smooth specimen with an artificial semi-circular slit and evaluated its refined surface characteristic and fatigue limit. The results obtained are:slit depth of the acceptable defect with the smooth specimen was 0.055 mm.