In this paper, rotating bending fatigue tests are carried out in order to clarify the difference of initiation and growth behavior of a crack in shot-peened carbon steel specimens and not-peened ones. The difference between the two is clarified through the successive observations of the specimen surface by the replication technique and the maeasurements of the residual stress during the fatigue test. The effect of shot-peening on the growth behavior of a crack is discussed based on the fact that it is classified into three parts : the effect in thin damaged layer due to shot-peening, the effect in owrk-hardened layer with residual stress and the effect in non-work-hardened layer.
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