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AISI 304 스테인리스 강판의 Nd:YAG 펄스 레이저 용접비드 형상예측을 위한 유한요소해석
조해용(Haeyong Cho),김관우(Kwanwoo Kim),홍진욱(Jinuk Hong),이제훈(Jaehoon Lee),서정(Jeong Suh) 한국레이저가공학회 2005 한국레이저가공학회지 Vol.8 No.1
Pulse laser welding of AISI 304 stainless steel plate was simulated to optimize welding conditions by using commercial finite element code MARC. Due to geometric symmetry, a half model of AISI 304 stainless steel plate was considered. For the heat transfer analysis, user subroutines were applied to boundary condition. The material properties such as conductivity, specific heat, and mass density were given as a function of temperature and the latent heat associated with a given temperature range was considered. A moving heat source was designed on the basis of experimental data. As a result, Nd:YAG laser welding for AISI 304 stainless steel was successfully simulated and it should be useful to determine optimal welding condition.
조해용(Haeyong Cho),김관우(Kwanwoo Kim),남기정(Gijeong Nam),이제훈(Jaehoon Lee),서정(Jeong Suh) 한국레이저가공학회 2006 한국레이저가공학회지 Vol.9 No.1
Glass is one of brittle materials. Generally, brittle material is weak for tensile stress but strong for compression stress. Laser breaking of glass used this brittle characteristics. Laser breaking of glass was simulated to optimize breaking condition by using commercial FEM code MARC which is applicable to thermo-mechanical coupling analysis. Various shapes of heat sources were applied to the analysis and the distance between heating and cooling source were varied for each simulation. The shapes of heat sources were circle, single and double ellipse and the distance was varied from 0㎜ to 30㎜. Moving heat sources were designed on the basis of experimental condition. As a result, double elliptic shape of heat source was the most suitable among them in laser breaking of glass. And it should be useful to determine optimal condition of laser breaking for glass.
박병준(Byungjoon Park),이문용(Munyong Lee),이규현(Gyuhyun Lee),조해용(Haeyong Cho) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
The use of light-weight material as aluminum has been being demanded gradually because the weight lightening of vehicles is excellent in fuel efficiency improvement and the driving performance improvement. In advanced automobile company overseas, Self Piercing Rivet technology that applies to the aluminum and Dissimilar materials, but there are little application cases in domestic market that are only rely on overseas technology skills. Therefore, I optimized design and made Prototype by Self Piercing Rivet technology with FEM Analysis through this research and verified the possibility of mass production for the Confidence Verification of Self Piercing Rivet technology by Strength and Fatigue Life and Corrosion Evaluation.
금속 벨로우즈 다이아프램 설계를 위한 CAD 프로그램 개발
조해용,김영훈 충북대학교 산업과학기술연구소 2002 산업과학기술연구 논문집 Vol.16 No.2
A design program for diaphragm of welded metal bellows was developed in this study. This program was written in AutoLISP language on the AutoCAD system. If a user inputs design variables, such as initial radius, inner and outer diameters, pitch, thickness of plate and land length, the diaphragm is automatically designed. The effects of altering some design variables on stress distribution and fatigue life of a bellows were estimated using commercial FEM code, NISA Ⅱ. As a result, the metal bellows diaphragm was successfully designed by the CAD program. The simulated results show that the spring constant and the maximum stress of a bellows are mainly determined by the thickness of the diaphragms. The initial radius and land length also affect the stress and fatigue life. The thickness of a bellows needs to be increased for a high operating life. On the other hand, for an increase in the degree of positioning accuracy, thickness must be decreased to reduce the mechanical resistance.
조해용,정용호 충북대학교 산업과학기술연구소 2002 산업과학기술연구 논문집 Vol.16 No.2
Conventionally, plate glass is cut by contact process like a diamond point tool or a diamond wheel. The cut surfaces used with this method are pretty rough and wavy. In this thesis, non-contact cutting method used by thermal stress is being introduced. Brittle material is usually weak for tensile stress but strong for compression force. And the configuration of brittle fracture is accomplished to propagate crack in a normal direction of maximum principal stress on the surface. Laser breaking of glass used this brittle characteristics process to propagate tensile stress on the surface by rapidly cooling at the limited area which is followed by heat treatment on the this area. In the study, the shape of heat source and interval between heating and cooling source are used by variables. The shape of heat source is applied to circle type, single and double ellipse type, and also the interval is diversified from 2mm to 30mm. Laser breaking of glass has to find optimum condition for laser braking of glass, heating and cooling process were simulated by using commercial FEM code which is applicable to thermo- mechanical coupling analysis. Theoretical analysis is compared to the results based on experiments.