Abstract
Fatigue properties of double notched specimen have been investigated using Ono-type rotating bending fatigue testing machine. Fatigue crack initiation and crack propagation behavior were observed by the successive-taken rep- lica method in the circumferential direction at the specimen's surface. From the experimental results, the fatigue micro-cracks of all specimens initiate by about 10% of the total fatigue life. In addition, the fatigue crack is initiated at the high stress distribution place. Moreover, the results were discussed by fatigue notch factor on double notched specimen.
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