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Hydroxy Aromatic Polyimide계 광폴리머 표면을 이용한 광배향 TN 셀의 전기광학 특성
이휘원,황정연,최성호,서동학,서대식,Lee, Whee-Won,Hwang, Jeoung-Yeon,Choi, Sung-Ho,Suh, Dong-Hack,Seo, Dae-Shik 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.10
We synthesized the two types of photoalignment material of high thermal resistance with hydroxyl aromatic polyimide, and studied the liquid crystal (LC) aligning capabilities on the photopolymer layers. Also, electro-optical (EO) performances for the twisted-nematic (TN)-liquid crystal display (LCD) photoaligned with linearly polarized UV exposure were investigated. A good LC alignment with UV exposure on the two types of photopolymer surface can be obtained. The Voltage-transmittance (V-T) curve in the photoaligned TN cell with UV exposure was different from two type. The response time of photoaligned TN cell was measured about 21 ms in two alkyl chain and about 15 ms in four alkyl chain.
Swaging에 의한 Autofrettage 加工의 有限要素解析
李澤淳,金東燮,李輝遠 영남대학교 공업기술연구소 1984 연구보고 Vol.12 No.1
Elastic-Plastic stress analysis has been carried out on an auto-frettage processed cylinder by mechanical push swaging. The analysis using finite element method was based on the incremental stress-strain relationship at the von-Mises yielding criterion and Prandtl-Reuss hypothesis in a axially symmetric plain stress condition. By this method, not only permanent enlargement of inner bore diameter but also residual stress distribution was calculated as a function of mandrel diameter. In consequence, enlargement of an autofrettage processed cylinder has good agreement between theoretical and experimental results. Thus, in autofrettage process the bore size and residual stress can be predicated using this method.
이휘원,양현태,김상태,Lee, Hwi-Won,Yang, Hyun-Tae,Kim, Sang-Tae 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.6
This study presents the hydrogen emblittlement in the metal, which decreases the ductility and then induces the brittle fracture. The contribution deals with the effect of strain rate and notch geometry on hydrogen emblittlement of 1.25Cr-0.5Mo and 2.25Cr-1Mo steels, which are in use at high pressure vessel. Smooth and notched specimens were examined to obtain the elongation and tensile strength. For charging the hydrogen in the metal, the cathodic electrolytic method was used. In this process, current density is maintained constant. The amount of hydrogen penetrated in the specimen was detected by the hydrogen determenator(LECO RH404) with the various charging time. The distribution of hydrogen concentration penetrated in the specimen was obtained by finite element analysis. The amount of hydrogen is high in smooth specimen and tends to concentrate in the vicinity of surface. The elongation and tensile strength decreased with the passage of charging time in 1.25Cr-0.5Mo and 2.25Cr-1Mo steels. The elongation increased and tensile strength decreased as strain rate increased. As a result of this study, it is supposed that 1.25Cr-0.5Mo steel is more sensitive than 2.25Cr-lMo steel in hydrogen embrittlement. Hydrogen embrittlement susceptibility of notched specimen after hydrogen charging is more remarkable than that of smooth specimen.