Abstract
Abstract— The influence of shot peening on the bending fatigue strength of hardened specimens of a carbon steel is reported. Effects of residual compressive stresses after shot peening, as a function of distance from the surface, are discussed along with the evidence of scanning electron micrographs from fractured specimens. Subsurface crack initiation is reported at all stress amplitudes below a threshold value of 1100 N/mm2. Assuming that the fatigue strength is enhanced locally due to compressive residual stresses the experimental results can be explained with the aid of the Goodman relationship.
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