Author(s)

S. Nishida, H. Hattori & Y. Kageyama

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. 1 Introduction More than 90% of failures of steel-structural components have eventually occurred from stress concentrated part such as notches. In real design, double notch is often inevitable. For examples, the case

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