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오환섭(Oh Hwan Sup),정효진(Jung Hyo Jin),김기호(Kim key ho) 한국생산제조학회 2005 한국공작기계학회 추계학술대회논문집 Vol.2005 No.-
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.
이종재 브레이징 접합부에서의 중간재(Insert metal)두께에 따른 열응력 해석 및 고찰
오환섭(Hwan sup Oh),김성재(Sung Jae Kim),김도형(Do hyung Kim),김형현(Hyung hyung Kim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
WC-12%Co and SCM440 were jointed by brazing method and they were heated until 1100 CO. However, while they were cooled, the residual stress was remained because of different thermal expansion coefficient a .<br/> Therefore, the residual stress makes stress singularity on the brazing joint surfaces and these stresses are one of the reasons to make fracture conditions. The object of study is to measure the residual thermal stress by using X-Ray method and to suggest the best thickness of insert metal.<br/>
오환섭(Oh Hwan-Sup) 한국자동차공학회 1989 오토저널 Vol.11 No.1
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.
오환섭(Hwan sup Oh),김경열(Kyung yul Kim),박종찬(Jong chan Park),박상정(Sang jung Park),탁영지(young ji Tak) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
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.