Abstract
Low cycle fatigue tests were performed for austenitic stainless steel, SUS316L, in order to investigate the effect of machined surface layer. For changing the machined surface layer, round bar specimens were machined by different condition of turning. Then, fatigue tests were carried out for the specimens machined by the different conditions. In addition, in order to separate the effect of surface shape and material property variations, we prepared the specimens, whose machined surface layers were removed completely or partly by polishing. Fatigue test results show that plastic deformation caused by machining as well as residual stress had small influence on fatigue lives. On the other hand, scratches reduced the fatigue lives. If there were scratches on specimen surface, many cracks initiated from the valley of scratches in a row. The cracks grew rapidly to be a semicircular crack almost as large as the scratch in early stage of fatigue life. But, fatigue lives of a specimen which had a few small scratches was similar to that of a specimen whose scratches were removed. Finally, fatigue crack propagations were predicted based on elasto-plastic fracture mechanics. We can predict safety side fatigue lives assuming a semicircular crack shape.
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