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오제훈,이대길,O, Je-Hun,Lee, Dae-Gil 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.11
During the curing process of thick glass/epoxy laminates, a substantial amount of temperature lag and overshoot at the center of the laminates is usually experienced due to the large thickness and low thermal conductivity of the glass/epoxy composites. Also, it takes a longer time for full and uniform consolidation. In this work, temperature, degree of cure and consolidation of a 20 mm thick unidirectional glass/epoxy laminate were investigated using an experiment and a 3-dimentional numerical analysis. From the experimental and numerical results, it was found that the experimentally obtained temperature profile agreed well with the numerical one, and the cure cycle recommended by the prepreg manufacturer should be modified to prevent a temperature overshoot and to obtain full consolidation.
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.
고분자 유기 EL 제조를 위한 멀티헤드형 잉크젯 패터닝 시스템
오제훈(Jehoon Oh),김시경(Sikyoung Kim),윤희열(Heeyoul Yoon),오세일(Seil Oh),강유명(Yoomyung Kang),김광일(Kwangil Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
According to the increase of lifetime and efficiency, the interest in the pLED has dramatically increased<br/> recently because pLED can be applied to large-size and flexible displays. The core process in the manufacture<br/> of pLED is the printing process of red, green and blue light emitting polymers (LEP), and inkjet printing<br/> method is one of the promising technology to print red, green and blue LEP on glass substrates. In this work,<br/> we developed a multi-head inkjet patterning system with 3 heads for each color. The developed inkjet<br/> patterning system is composed of the precise positioning system, head controller circuit, real-time ink drop<br/> evaluation system, maintenance system, and stable ink supply system. Finally, we investigated the stability<br/> and reliability of the system by printing red, green and blue LEP on the dummy substrate.
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.