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A6061-T6/AZ31 이종금속 마찰교반접합부의 기계적 특성에 미치는 툴 삽입 위치의 영향
이광진,김상혁,Lee, Kwang-Jin,Kim, Sang-Hyuk 대한용접접합학회 2012 대한용접·접합학회지 Vol.30 No.5
Butt-joints of A6061-T6 and AZ31 plates were successfully manufactured by using a friction stir welding method. Off-set free joints and off-set joints were fabricated to investigate the effect of the tool plunge position on the mechanical properties of the joints. Hardness test, tensile test and charpy impact test was performed to evaluate the mechanical properties of the joints. Off-set condition resulted in increase of mechanical properties of the joints. The variation of the hardness distribution in the SZ was also stabilized in the off-set condition. Tensile strength of the off-set joint was about 85% against to that of the AZ31 base metal. Impact absorption energy by Charpy-Impact-Test of the off-set joint also increased by almost 2 times against to that of the AZ31 base metal.
이광진,김형자,Kwang-Jin, Lee,Hyung-Ja, Kim 한국기계가공학회 2004 한국기계가공학회지 Vol.3 No.3
The sub-surface stress field beneath the spur gear's contact surface in lubricated condition has been analysed. The surface pressure was obtained by the elasto-hydrodynamic lubrication analysis using the accurate geometric clearances around the contact region of the teeth. The sub-surface stress field was calculated by using the Love's rectangular patch solution. The analysis results show that the sub-surface stress distribution is quite dependent on the surface pressure distribution. The pattern of sub-surface stress field is similar to that of the external load. The depth where the maximum effective stress occurs is not proportional to the intensity of the external load.
On-line Screening HPLC-ABTS<sup>+</sup> Assay을 이용한 산청목으로부터 Salidroside의 분리 및 생물활성 분석
이광진,송나영,마진열,Lee, Kwang Jin,Song, Na-Young,Ma, Jin Yeul 한국생물공학회 2014 KSBB Journal Vol.29 No.2
Acer tegmentosum was a traditional Korean herbal medicine showing various pharmacological activities. In this work, A. tegmentosum were extracted with boiling water and then successively partitioned with dichloromethane, ethyl acetate, n-butyl alcohol (n-BuOH), and water. Salidoside, the target compound, was purified in n-BuOH phase using a chromatography method. For the analysis of salidoside, TLC and LC-MS were used as well as on-line screening $HPLC-ABTS^+$ assay with three different wavelength of 254, 280, and 320 nm. An amount of 1.34 g of salidoside were obtained in n-BuOH phase fromAcer tegmentosum was a traditional Korean herbal medicine showing various pharmacological activities. In this work, A. tegmentosum were extracted with boiling water and then successively partitioned with dichloromethane, ethyl acetate, n-butyl alcohol (n-BuOH), and water. Salidoside, the target compound, was purified in n-BuOH phase using a chromatography method. For the analysis of salidoside, TLC and LC-MS were used as well as online screening $HPLC-ABTS^+$ assay with three different wavelength of 254, 280, and 320 nm. An amount of 1.34 g of salidoside were obtained in n-BuOH phase from 3 kg of dry biomass. The on-line screening $HPLC-ABTS^+$ assay is rapid and efficient tool to search bioactivity from A. tegmentosum. 3 kg of dry biomass. The on-line screening $HPLC-ABTS^+$ assay is rapid and efficient tool to search bioactivity from A. tegmentosum.
Al-Mg-Si계 알루미늄 합금 판재 마찰교반접합부의 결정 방위 분포에 대한 용접후열처리의 영향
이광진,Lee, Kwang-Jin 대한용접접합학회 2009 대한용접·접합학회지 Vol.27 No.6
Friction stir welding (FSW) was carried out for Al-Mg-Si series aluminum alloys which are being used for automotive body structure. Consequently, Post weld heat treatment (PWHT) was applied to the friction stir welds to evaluate the effect of the paint baking process which is one of the automotive fabrication process on friction stir welded zone (FSWZ) in 443K for 1.2Ks. Grain structure and its crystal orientation distribution was measured about both the as welded specimens and the post weld heat treated specimens. An optical microscope (OM) and an field emission scanning electron microscope (FE-SEM) was used for observing the grain structure and measuring its crystal orientation distribution, respectively. Changes on the grain structure and its crystal orientation distribution were not detected. From the present results, it was confirmed that the paint baking process after FSW do not affect on the grain structure and its crystal orientation distribution of FSWZ. The comprehensive investigations will be performed for various automotive aluminum alloys manufactured by different processes, in the future.
이광진,김상혁,권의표,손규송,Lee, Kwang-Jin,Kim, Sang-Hyuk,Kwon, Eui-Pyo,Son, Kyu-Song 대한용접접합학회 2014 대한용접·접합학회지 Vol.32 No.2
Friction stir welding (FSW) was successfully performed about 900MPa grade Twinning Induced Plastisity (TWIP) steel. A PCBN tool with convex-type shoulder was applied. Optimal process conditions were deduced. Microstructure and mechanical properties such as hardness, tensile strength and impact absorbed energy were observed and evaluated, respectively. An optical microscope (OM) and a field emission scanning electron microscope (FE-SEM) was selected for observing the grain structure.
마찰교반용접(FSW) 및 마찰교반처리(FSP)의 최신 연구개발 동향
이광진,Lee, Kwang-Jin 대한용접접합학회 2013 대한용접·접합학회지 Vol.31 No.2
The latest research & development trend on friction stir welding and friction stir processing technologies presented in the international symposium, 'Friction Stir Welding & Processing VII'. Papers and presentations about high temperature materials such as advanced high strength steel, stainless steel and titanum alloy shoot up this year. Papers on modeling of metal flow and control of process parameters also increased. The FSP technologies for manufacturing of carbon materials reinforced metal matrix composites were reported, too.
액체로켓엔진 연소기용 지상연소시험설비의 소방시스템 구축
이광진(Kwang-Jin Lee),조남경(Nam-Kyung Cho),한영민(Young-Min Han) 한국추진공학회 2013 한국추진공학회 학술대회논문집 Vol.2013 No.12
연소시험설비의 특수성에 의해 액체로켓엔진 연소기용 지상연소시험설비는 비상구 및 소화전를 포함한 위험물 소화 설비와 안전밸브, 가스 감지, 누유 감지, 인터락 장치와 같은 안전 설비등이 고려되어 구축되어야 한다. 본 논문에서는 액체로켓엔진 연소기용 지상연소시험설비를 구축함에 있어서 위험물 안전관리 관점에서 적용된 안전 설비를 중심으로 설계 기준을 제시하고자 한다. The ground hot-firing test facility for a Liquid Rocket Engine Combusiton Chamber should be constructed with safety equipments like as fire fighting equipment with emergency exit and fireplug, safety valve, gas monitoring equipment, oil leak sensing device and interlock device due to distinct characteristics of hot-firing test faility. The purpose of this paper is to describe the design criteria of applied fire fighting system in the aspect of safety supervision of dangerous substance on the construction of the ground hot-firing test facility.
이광진(Kwang-Jin Lee),김지훈(Ji-Hoon Kim),정용갑(Yong-Gahp Chung),조남경(Nam-Kyung Cho),한영민(Young-Min Han) 한국추진공학회 2013 한국추진공학회 학술대회논문집 Vol.2013 No.5
엔진의 핵심요소인 연소기는 엔진의 추력을 발생시키는 장치로 우주발사체 개발 시 선행단계에서 개발되어야 한다. 이를 위해 연소기의 연소시험이 필요한데, 이 시험들로부터 연소기의 성능 및 신뢰도를 평가하게 된다. 이 시험들을 수행하기 위한 국내 시험설비의 구축은 외국 시험기관에 의존할 수 있는 문제점을 해소할 수 있을 것으로 기대한다. 그리고 이 설비는 연소기 개발 일정 단축과 비용 절감 효과에 영향을 줄 것으로 보이며, 더 나아가 국내 항공우주분야 관련 업체의 기반을 확대해 줄 것으로 사료된다. A combustion chamber, one of engine components, must be developed in precedent stage of space launch program. For this, hot-firing tests of combustion chamber are needed. The performance and reliability of the combustion chamber are evaluated in these tests. Construction of the domestic facility for conducting these tests is expected to relieve the problem of depending on the foreign agency. And this facility has an effect on shortening schedule and cost reduction of combustion chamber development. Futhermore, it is considered that the infrastructures of aerospace-related industries are expanded through building up the facility.