Abstract
Rotating bending fatigue tests were made on specimen which were polished longitudinally or circumferentially with two kinds of silicon carbide papers and then elecro-polished. The fatigue processes were observed successively by the two stage plastic replica method, with special attention given to the starting points of a final fracture . The materials used are a normalized S45C steel, and a quenched and tempered S45C steel. The main results obtained are as follows : (1) Non-propagating micro-cracks are observed on the surfaces of the specimens after 107 cycles of the fatigue limit. (2) The characteristics of a change in surface states due to stress repetitions can be explained in terms of the notch sensitivity of the material and the roughness of the specimen surface.
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