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오제훈,이대길,이수정,이종수,Oh, Je-Hoon,Lee, Dai-Gil,Lee, Su-Jeong,Lee, Jong-Soo 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.6
The finite element analysis for the tubular alumina liner which was shrink-fitted into a heat treated high speed steel (HSS) sleeve and subjected to high inner pressure and high temperature was performed. The parameters for the analysis were the interference between the alumina and the HSS, the temperature, the inner pressure, the coefficient of friction between the alumina and the HSS, and the taper at the sleeve ends. From the analysis, it was found that the tensile hoop stresses were decreased when the end parts of the HSS sleeve were tapered and the tensile stresses were decreased as the coefficient of friction between the alumina and the HSS was decreased. Also it was found that the alumina might be used as the structural liner for high pressure and high temperature when it was shrink-fitted into a heat treated HSS sleeve.
횡방향 하중을 받는 일방향 탄소섬유/에폭시 복합재료의 미시역학 해석
오제훈(Je Hoon Oh),진교국(Kyo Kook Jin),하성규(Sung Kyu Ha) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The micromechanical approach was used to investigate the interfacial behavior of a unidirectional composite under transverse loading. Representative volume elements (RVE) for the analysis were composed of regular fiber arrays (square and hexagonal arrays). The finite element analysis was performed to evaluate the effective material properties of a carbon/epoxy composite and to analyze the normal, tangential and shear strains at the interface. The microstructural fiber arrangement would have a great influence on interfacial strain distributions while it little affects the effective material properties. The RVE with random fiber arrays will be considered in the future work.
불규칙 섬유배열을 가진 일방향 복합재료의 미시역학적 해석
진교국(Kyo Kook Jin),오제훈(Je Hoon Oh),하성규(Sung Kyu Ha) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
The micromechanical approach was used to investigate the interfacial strain distributions of a unidirectional composite under transverse loading in which fibers were usually found to be randomly packed. Representative volume elements (RVE) for the analysis were composed of a random fiber array. The Fourier series approximation with proper coefficients was utilized to evaluate the strain distributions at the interface for the regular and random fiber arrays with respect to fiber volume fractions. From the analysis, it was found that the random arrangement of fibers had a significant influence on the strain distribution at the interface, and the strain distribution in the regular fiber arrays was one of special cases of that in the random fiber array.
808 ㎚ 조명 레이저 및 광학 필터를 이용한 아크 용접 현상 고속촬영 기법
이태현(Tae Hyun Lee),오제훈(Je Hoon Oh),감동혁(Dong-Hyuck Kam) 대한용접·접합학회 2020 대한용접·접합학회지 Vol.38 No.5
In this study, high-speed photography was performed for Gas Metal Arc Welding using an 808 nm diode laser and an optical filter. A Neutral Density(ND) filter and an 808 bandpass filter were used to an excluded arc light. We observed that the applied ND filter succeeded in capturing the drop transfer, but the arc image could not be excluded. When considering the spectral distribution of the arc, the 808 nm diode laser is suitable for recording a high speed camera sensor. The Full Width Half Maximum (FWHM) 3 nm of 808 nm bandpass filter is suitable for removing the arc spectrum signal. By combining an 808 nm diode laser and an 808 nm bandpass filter, we obtained a clear image of the drop transfer without the arc light.
김영헌(Young Heon Kim),오제훈(Je Hoon Oh),신금철(Kum Cheol Shin),윤민재(Min Jae Yoon),민병권(Byeong Gwon Min),박진규(Jin Gyu Park) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
As automotive industry become quieter, the interest in the wiper is increasing. The wiper system of a car is carried out the wiping of the windshield for securing a clear view. The most of complaints of wiper concern operation noise. The noise operation can be classified into three main categories namely, chattering, reversal vibration and squeal noise. In this paper, we focus on reversal vibration mainly occurred by reversal action. We use commercial software ANSYS for finite element analysis (FEA). The real behavior of wiper blade was observed by high speed camera (HSC). To reduce operation noise caused by reversal vibration, we use design of experiment (DOE) method for important variables such as friction coefficient, input force and damping coefficient.