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임상훈(Lim Sang Hoon),이남호(Lee Nam Ho),임복규(Lim Bok Kyu) 한국태양에너지학회 1991 한국태양에너지학회 논문집 Vol.11 No.3
본 고에 있어서는 겨울철 난방으로 인한 난방비 절감과 동시에 무공해이며 쾌적한 교육환경을 조성하고자 자연형태양열시스템의 한 부류인 직접획득형 시스템을 적용한 직접획득형 자연형태양열학교를 설계하고 그 열적성능을 분석하였으며, 이에 따른 경제성 문제도 아울러 검토하였다. Following the oil crisis in 1979, there have been surge of movements by the government in Korea to conserve petroleum-based energy in every sector of society.<br/> One of these movements was the application of passive solar technologies into the construction of school buildings. Various passive designs are developed paying special regard to architectural and climatic factors.<br/> This paper is related to the application of the passive solar technology(direct gain system) to high school buildings.
김민건(Min Gun Kim),임복규(Bok Kyu Lim),이병현(Byeong Hyeong Lee) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.8
In this study, low cycle fatigue tests were carried on GCD 45 in an extremely low cycle fatigue (ELCF) regime, and low cycle Fatigue simulation was carried on the optional size distribution of graphite. Successive observations of internal fatigue damage were performed Moreover, the calculation of the change of fatigue life with the variation of micro structural parameters were performed using the fracture process model which has been obtained by the examination of the micro fracture process of low cycle fatigue of GCD 45. The results obtained are as follows. (1) The process of ELCF can be classified into three stages which are composed of the generation, growth and coalescence of microvoids inside materials. (2) In an ELCF regime, microvoids originate from debonding of graphite-matrix interface. (3) The internal microvoids grow toward a vertical direction to the load. The growth rate of internal microvoids increases with an increase of plastic strain range. (4) In an ELCF regime, the mechanism of micro void coalescence has two types. One is the coalescence of microvoids due to the growth of internal cracks originated from the microvoids and the other is by internal necking of the matrix between microvoids under subsequent loading.
극저사이클 하중을 받는 구상흑연주철의 초기균열성장에 관한 연구
김민건,임복규,김동열 江原大學校 産業技術硏究所 2002 産業技術硏究 Vol.22 No.A
In this study, extremely low cycle fatigue tests were carried out under push-pull loading conditions using graphite cast iron (GCD). In order to clarify the fatigue fracture mechanism of GCD in an extremely low cycle fatigue regime successive observations of internal fatigue damage were performed. The results obtained are as follows. (1) The process of extremely low cycle fatigue can be classified into three stages which are composed of the generation, growth and coalescence of microvoids inside materials. (2) In an extremely low cycle fatigue regime, microvoids originate from debonding of graphite-matrix interface.
마하피닝 처리에 의한 기계구조용 합금강의 피로균열전파 지연효과
김민건,임복규,박홍기,황중각 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.B
Mach peening treatment is one of the various kinds of techniques to improve the fatigue properties. The mach peening process gives high-level work hardening and compressive residual stress near the surface layer, improving the fatigue strength. In addition, this treatment reduces slip bands that initiate the fatigue cracks near the surface. During impingement, a plastic indentation surrounded by a plastic zone is formed. Mach peening treatment characteristic is less energy consumption and is an environmental friendly processing methods that is not accompanied by pollution. It is machining process that can prevent fatigue fracture beforehand in structure using already as well as process of production. The test results showed that fatigue crack propagation delay appeared by drilling type 43%, mach peening type 110%.
오스템퍼링처리한 구상흑연주철의 오스테나이트화 조건에 따른 기계적 성질 및 피로한도에 관한 연구
김민건,임복규 江原大學校 産業技術硏究所 2004 産業技術硏究 Vol.24 No.A
This study was performed to investigate the effect of two step austenitized treatment on the mechanical properties and fracture characteristic of the ductile cast iron and austempered ductile cast iron(ADI). The obtained results of this study were as follows. The matrix structures of specimens were changed differently by austenitizing heat treatment Microstructure of austempered ductile cast iron obtained by two step austenitized treatment was bainitic ferrite and retained austenite. With two step austenitized treatment, vield strength, tensile strength and hardness decreased, while the elongation increased.
마하피닝 처리에 의한 기계구조용 합금강의 피로균열전파 지연효과
김민건,임복규,박홍기,황중각 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.A
Mach peening treatment is one of the various kinds of techniques to improve the fatigue properties. The mach peening process gives high-level work hardening and compressive residual stress near the surface layer, improving the fatigue strength. In addition, this treatment reduces slip bands that initiate the fatigue cracks near the surface. During impingement, a plastic indentation surrounded by a plastic zone is formed. Mach peening treatment characteristic is less energy consumption and is an environmental friendly processing methods that is not accompanied by pollution. It is machining process that can prevent fatigue fracture beforehand in structure using already as well as process of production. The test results showed that fatigue crack propagation delay appeared by drilling type 43%, mach peening type 110%.