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허선철,박영철,이동화,이광영,박원조 경상대학교 해양산업연구소 2002 해양산업연구소보 Vol.15 No.-
In this study, it is peformed to optimize important design variables of 3 dimensional GMI-36 Yoke which has a complicated shape. The design variables are a long and a short axis of an ellipse and parameters of upper part of Yoke and outer diameter of lower part of Yoke and the constraints are maximum stress and displacement. The weight of Yoke is minimized using Subproblem Approximation Method. The result is that 3.8% of total weight is reduced through this optimization and the feasibility of design compared with that of conventional model can be verified..
X-선 회절에 의한 SS41 불림재와 M.E.F. 복합 조직강의 피로 파단면 해석에 관한 연구
허선철,박영철,박수영,김득진,오세욱 韓國非破壞檢査學會 1996 한국비파괴검사학회지 Vol.16 No.1
본 연구에서는 SS41 불림재와 M.E.F. 복합 조직강에 대해서 파괴 역학 파라미터와 X-선 피라미터 사이의 관계를 규명하였다. 피로 균열 진전 실험이 수행되었고, X-선 회절 방법이 피로 파단면에 적용되었다. 피로 파단면을 순차적으로 전해 연마하면서 깊이에 따른 X-선 파라미터(잔류응력, 반가폭)의 변화를 관찰하였다. 최대 소성역 깊이 Wy는 SS41 불림재에서는 반가폭의 분포로, M.E.F. 복합 조직강에 대해서는 잔류 응력의 분포로 결정할 수 있었다. 피로 파단면의 깊이 방향에 따른 X-선 파라미터의 분포로부터 Kmax와 Wy의 관계식이 실험 데이터로부터 얻어지고, 이 식들로부터 Kmax은 Wy의 측정에 의하여 추정되어질 수 있다. This study verified the relationship between fracture mechanics parameters and X-ray parameters for normalized SS41 steel with homogeneous crystal structure and M.E.F. dual phase steel(martensite encapsulated islands of ferrite). The fatigue crack propagation test were carried out and X-ray diffraction technique was applied to fatigue fractured surface. The change in X-ray parameters(residual stress, half-value breadth) according to the depth of fatigue fractured surface were investigated. The depth of maximum plastic zone, Wy, were determined on the basis of the distribution of the half-value breadth for normalized SS41 steel and that of the residual stress for M.E.F. dual phase steel. Kmax could be estimated by the measurement of Wy.
허선철(Sun-Chul Huh),박원조(Won-Jo Park),김귀남(Gwi-Nam Kim),박준성(Jun-Sung Park),최부영(Boo-Young Choi) 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
Recently, shipbuilding design techniques is developing so fast. As a result, vessels and plant became large, and is required arctic vessel for polar resource development. However, steel show brittle nature at reduce temperature. So research of character is increased under low temperature. In this study, thick plate has been used to measure the fracture toughness to evaluate at low temperature, using AIS3000 indentation tester and impact tester. And micro structure analysis for fracture surface has been observed by SEM.
허선철(SunChul Huh),이광영(KwangYoung Lee),박원조(WonJo Park),김병화(ByungHwa Kim),정군석(GunSug Jung) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Wings for defense industry such as fighters, missiles, and rockets should have no deformation or damage on the structure, strength, and hardness safety of constituted pared and the structures near to the bodies. The structures of existing wings had holes for light weight and plates and frames were fixed with rivets or screws, thus, there were difficulties and limits in light weight. In this study, an improvement was made in current joint methods through EB welding and laser welding for light weight of wings and welding strength was measured through strength test. In addition, finite element analysis was performed for welding process so as to induce optimum welding condition.
Mitsunobu 반응을 이용한 Ethyl 2-Fluoro-2-phenylsulfonylethanoate의 벤질화 반응
허선철,김대영 순천향대학교 기초과학연구소 1999 순천향자연과학연구 논문집 Vol.5 No.1
1-1'-(아조디카르보닐)-디피페리딘(ADDP)-트리부틸포스핀(TBP)을 이용한 Mitsunobu 반응을 통하여 에틸 2-플루오르-2-페닐술포닐에탄오에이트와 벤질알콜로부터 에틸 2-플루오르-3-페닐-2-페닐술포닐프로판오에이트를 비교적 높은 수율로 합성 하였다.
허선철(S. C. Huh),전영흥(Y. H. Jun),정한식(H. S. Chung),정효민(H. M. Chung),심규진(K. J. Shim),이정열(J. Y. Lee) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The refrigerator cylinder block be made of cast material. But, It is necessary to use engineering plastic material instead of cast material in compressor cylinder block manufacture in order to light weight and reduction of manufacture cast. In this study, I would like to offer basic design data of plastic material alteration on the basic of structure analysis of current product using CATIA Ver.5.9
압업시험기를 이용한 후판용접재의 잔류응력 분포에 관한 연구
허선철(Sun-Chul Huh),김귀남(Gwi-Nam Kim),이종석(Jong-Seok Lee),박철홍,박준성(Joun-Sung Park),박원조(Won-Jo Park) 한국해양공학회 2011 韓國海洋工學會誌 Vol.25 No.6
Recently, the production at shipbuilding and offshore plant industries, with a trend toward large structures, has led to an increased use of high strength ultra-thick plates. The use of ultra-thick plates increases the welding tasks, and the welding process generates distortion and residual stress in the weldment because of the rapid heating and cooling. Welding distortion and residual stress in the welded structure resulte in many troubles such as deformation and life deterioration. In particular, the welding residual stress has an important effect on welding deformation, fatigue, buckling strength, brittleness, etc. The purpose of this study was to evaluate the residual stress at a multi-pass weldment using an experimental method for EH36 high-tension steel. In this experimental method, AlS3000 was used to measure the residual stress of a welded part, HAZ, and base metal; EPMA and XRD were used to study the material properties.
허선철(Sun-Chul Huh),박영철(Young-Chul Park),윤두표(Doo-Pyo Yun) 한국해양공학회 1998 韓國海洋工學會誌 Vol.12 No.4
Since the ceramic and metal are joined at high temperature, the residual stress will develop when it is cooled from bonding temperature due to remarkable difference of thermal expansion coefficient between ceramic and metal. Moreover, the edge of jointed interface makes singular stress field and this singular sσess field influences on the strength of joints. In this study. The effects of residual stress, mechanical load and repeat thermal cycle were estimated in the ceramic/metal joints. The change of singular stress field due to these effectswas analyzed. The results are as follow : 1) Strength of jcints was evaluated by the sσess singularity index λ and the intensity K of singular stress field. 2) The stress singularity index λ and the intensity K of singular stress field also increase as temperature of thermal cycle and its number of cycle increase. 3) In the case of mechanical load, the effect of residual stress reduces since the difference(Δλ) of stress singular index between existence and inexistence of residual stress decreases in proportion to the increasing of tensile load.