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소형선박용 5000계/6000계 알루미늄합금제의 마찰교반접합 특성 연구
조제형,김명현,최준웅,Cho, Je-Hyoung,Kim, Myung-Hyun,Choi, Jun-Woong 대한용접접합학회 2014 대한용접·접합학회지 Vol.32 No.1
There are so many difficulties of melt bonding mainly applied for hull construction of a aluminum alloy small boat. For resolving this problem, Friction stir welding(FSW) in non-melting solid state welding Process generally is applied in the transport industry. This paper is studied the joining strength characteristics and macrostructure according to dissimilar aluminium 5000/6000 alloy joining for a small boat applied for this FSW technology. It is reported that difference of joining strength in accordance with the direction of rotation in case of friction stir welding between dissimilar metals(Al/Cu, Al/Fe) is also highly large. In this study, Test is carried out by making the specimen according to the direction of rotation of dissimilar aluminium alloy joining.
보트에 적용되는 하이브리드 복합재에 대한 기계적 특성 연구
조제형(Je-Hyoung Cho),김성훈(Sung-Hoon Kim),윤성원(Sung-Won Yoon),하종록(Jong-Rok Ha),김명현(Myung-Hyun Kim) 대한용접·접합학회 2016 대한용접·접합학회지 Vol.34 No.2
Recently, Application of composite materials are increased in transport area for weight reduction. Also, Related technical developments have been implemented actively at domestic and abroad. In particular, The carbon fiber has high strength and ultra light property higher than stainless steel, aluminum, GFRP as Eco-friendly material. Carbon fiber contribute to improving the environmental effect such as fuel saving, expansion of loadage, reducing the exhaustion of carbon dioxide through the weight reduction of transport area. In addition, The carbon fiber is applied to the ship in the area of race yacht, luxury cruise boat as weight reduction and high added-value materials, but there is limited application for general boat because price of carbon fiber is very expensive. For the weight reduction of general boat hull, being used as structure materials, glass fiber and carbon fiber are applied to hull with form of hybrid composite materials, but application of domestic and research for development are incomlete. In this study, An evaluations of mechanical strength property and fatigue strength are performed on composite materials by hybrid weaving of glass fiber and carbon fiber and composite materials forming method by hybrid forming.
김헌우(Hyen-Woo Kim),백영수(Young-Su Back),조제형(Je-Hyoung Cho),임장곤(Jang-Gon Im),최학묵(Hak-Mook Choi) 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.3 No.2
현재 조선산업은 선박의 대형화 추세에 맞추어 선체블록 규모가 대형화되고 있다. 따라서 대형 선체블록제작을 위한 블록전문업체가 증가하고 있으며, 그에 따른 블록조립 및 정도계측기술 개발이 절실히 요구되고 있다. 이에 본 연구에서는 그간 수행해온 블록계측과 관련된 각종 데이터베이스를 구축하고, 시스템 기능구현에 핵심 기술인 소프트웨어 개발 기법, 정보 가시화 기법을 제시하고 이를 이용한 인터페이스를 개발하여 본 시스템의 구성요소를 유기적으로 연결하여 사용하는 과정을 시연함으로써 블록조립 정도평가 시스템의 유용성과 기능을 검증하였다.
C1020/Al6063 이종 합금의 맞대기 마찰교반접합의 접합특성
고영봉(Young-Bong Ko),최준웅(Jun-Woong Choi),조제형(Je-Hyoung Cho),김헌우(Hyen-Woo Kim),박경채(Park Kyeung Chae) 한국표면공학회 2009 한국표면공학회지 Vol.42 No.5
The Friction Stir Welding (FSW) has mainly been used for making butt joints in Al alloys. Development of FSW would expand the number of applications. The FSW is a relatively solid-state joining process. This study possibility of a welding between C1020 and Al6063 by means of FSW has fundamentally clarified. The primary process parameters, such as a rotating speed, rotating direction of tool and off-set of pin periphery from materials interface were optimize, respectively.
LNGC 경량화를 위한 파이프 지지용 클램프의 복합소재 적용 연구
배경민 ( Kyong-min Bae ),임윤지 ( Yoon-ji Yim ),윤성원 ( Sung-won Yoon ),하종록 ( Jong-rok Ha ),조제형 ( Je-hyoung Cho ) 한국복합재료학회 2021 Composites research Vol.34 No.1
조선해양 산업에서 선박의 에너지 절감과 운항효율 향상을 위한 부품의 경량화 기술이 요구됨에 따라서, 고강도의 경량소재인 섬유강화 복합소재를 부품소재로 적용하는 방안이 검토될 수 있다. 본 연구에서는 LNGC 경량화를 위해 파이프 지지용 클램프의 섬유강화 복합소재 적용 가능성을 평가하였다. 탄소섬유 및 유리섬유를 강화섬유로 하여 섬유강화 복합소재를 제조하였으며, 컴퓨터 시뮬레이션 프로그램을 통해 복합소재의 강화재료와 기지재료의 물성을 역계산하여 섬유 적층 패턴별 물성 변화에 따른 성능 예측을 수행하였다. 또한, 유한요소해석 프로그램를 통해 복합소재 두께에 따른 클램프의 구조해석을 수행하였다. 연구결과 경량화를 위해 클램프의 섬유강화 복합소재의 적용시 두께 선정에 주의가 필요함을 확인할 수 있었다. 향후 보완 설계 시 구조물의 형상변경 및 경량화를 위한 구조변경에 용이할 것으로 판단된다. In the shipbuilding and marine industry, as a technology for reducing the weight of parts to reduce energy and improve operational efficiency of ships is required, a method of applying fibers-reinforced composites which is high-strength lightweight materials, as part materials can be considered. In this study, the possibility of applying fibers-reinforced composites to the pipe support clamps was evaluated to reduce the weight of LNGC. The fibers-reinforced composites were manufactured using carbon fibers and glass fibers as reinforcing fibers. Through the computer simulation program, the properties of the reinforcing materials and the matrix materials of the composites were inversely calculated, and the performance prediction was performed according to the change in the properties of each fiber lamination pattern. In addition, the structural analysis of the clamps according to the thickness of the composites was performed through the finite element analysis program. As a result of the study, it was confirmed that attention is needed in selecting the thickness when applying the fibers-reinforced composites of the clamp for weight reduction. It is considered that it will be easy to change the shape of the structure and change the structure for weight reduction in future supplementary design.