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This study was performed to investigate the effect of defect. on fatigue strength under the stress of rotary bending. The specimens were made of low carbon steel having artificial microholes, namely, single micro-hole and two adjacent micro-holes as natural deffects, and the effects of the diameter of hole and the distance between the holes on fatigue strength have been investigated.<br/> The obtained result can be summarized as follows;<br/> 1. The critical defect means the largest size of deffect that does not affect fatigue limit, and correspondes to the size of defect leading to final fracture under fatigue limit of smooth specimen. The size of defect which has an effect on fatigue limit is larger than that of critical defect.<br/> 2. The defect larger than the critical defect affects fatigue strength for as a kind of size effect, and the physical meaning of size effect of defect is considered same as the one of notch effect.
In this study, geometric shape and crack in welded interface of the air cooled heat exchanger Fin-Tube was analysed. The object of study is to give insight for understanding the behavior of Stress Intensity Factor for fin length, flash thickness, flash length, symmetric and asymmetric cracks of fin producing in manufactural processed. Stress Intensity Factor was analysed by BEM. Kelvin's solution was used as a fundamental solution in BEM analysis and displacement extrapolation method was used to determine Stress Intensity Factor.
In this research, for find a stress Intensity Factor K of double surface crack, the BEM was selected. Using 3D BEM, Stress Intensity Factor of double surface crack was calculated for strength of material and its life estimation. And try to find behavior of crack growth. In this research, surface part of crack is more interfered than the deep part. And then, in the deep part, ratio of oval did not affect. In case of different size, crack growth was expected from the bigger one. As a result, we can know that size of crack affect in crack growth.