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In this study, behavior of fracture and crack under tensile and torsion test is shown. Fracture behavior of friction welded dissimilar materials is closely realated with direction of friction welding especially in the case of torsion test. Neking on yield point in other friction welding condetion for tension test is shown. It is observed that fracture is occurred by crack growth and joining not occurred by combination of void.<br/>
This study is very important to define the characteristic of thermal fatigue for tungsten filament in the view of micro-order scale. As the result of this study about thermal fatigue for tungsten fIlament, An empirical formula, such as V=30.20- 3.59logN, is made from the relation between change of voltage and number of cycle. New fracture mechanism of thermal fatigue is suggested for tungsten filament's fractography.
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.
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.