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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),김응순(Eung soon Kim) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
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.
오환섭(Hwan-Sup Oh),오정국(Jeong-Kug Oh),박준건(Joon-Gun Park),박경식(Kyung-Sik Park) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
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/>