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황재중,이철우,김영남,심재기,양인영 朝鮮大學校 機械技術硏究所 2003 機械技術硏究 Vol.6 No.1
본 연구에서는 CFRP 복합재 적층쉘 형상의 구조부재 설계 시 고려해야 할 고강성, 고강도 측면을 중점으로 2개의 계면수를 갖는 직교이방성 CFRP 복합재 적층쉘에 대하여 횡방향 하중 정적실험 및 ANSYS를 이용한 유한요소해석을 행하여 직교이방성 적층쉘의 역학적 특성을 실험 및 유한해석을 통하여 고찰하고자 한다. 또한, 곡률의 크기에 따른 CFRP 적층쉘의 충격특성을 정량적으로 평가하기 위하여 충격속도의 크기에 따른 에너지 흡수특성 및 충격손상기구를 규명하고자 한다. 정적실험의 경우보다 FEM해석의 경우가 약 25%∼35% 정도 높게 나타났고 충격에너지가 증가할수록 박리현상은 선형적으로 증가하였으며, 같은 충격에너지 범위라 할지라도 곡률 반경이 증가할수록 흡수에너지는 증가하였다. Centering on high rigidity and intensity 'to be considered in the design of sub-materials of the perpendicular anisotropic CFRP composite material laminate shells with two interlaminar number, this study performed width-direction load static experiments and the finite element method using the ANSYS to examine dynamic properties of perpendicular anisotropic laminate shells. Also, to evaluate the impact property of the CFRP laminate shell according to size of curvature quantitatively, it was to identify energy absorption and impact damage instruments according to size of impact speed. Absorption energy of the .FEM analysis was about 25-35% higher than that of the static experiment and the more impact energy increased, the more damage area increased linearly. Despite of the same impact energy range, the more curvature radius increased, the mere absorption energy.
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김영남,황재중,차천석,심재기,양인영 朝鮮大學校 機械技術硏究所 2002 機械技術硏究 Vol.5 No.1
본 연구에서는 일 방향 CFRP 복합재 튜브에서 나타나는 상이한 압궤특성의 일관성을 보이고자 하며, 또한 계면수가 에너지 흡수능력의 함수인지 아닌지를 결정하고자 한다. 계면수는 최외층각도 0?를 갖는 4가지 형태(계면수는 2, 3, 6, 7 개)이며, 각 튜브에 압궤하중이 가해졌을 때 그 응답은 압궤과정을 제어하는 상이한 메카니즘 사이에서의 상호작용에 의존하고 그것을 매우 복잡하다. 따라서 본 연구에서는 정적 및 충격압궤실험을 행하고, 그 결과 계면함수, g(k)에 대해 정의하였다. 또한 일반적으로 [0/90〕_(2s) 적층된 CFRP 튜브가 더 높은 에너지를 흡수하였으며, 이론적 및 실험적 데이터는 서로 일치하였다. The objective of this paper is to present a consistent description of the different collapse characteristics exhibited by uni-directional CFRP(Carbon Fiber Reinforced Plastics) composite tubes and determine whether the energy-absorption capability of these tubes is a function interlaminar number. Tube interlaminar number was 4 types (2, 3, 6 and 7) included ply orientation angle of outer was 0. When such tubes are subjected to crushing loads, the response is complex and depends on the interaction between the different mechanisms that control the crushing process. In this study static and impact collapse test were performed and the results have been shown as a function interlaminar number(g(k)). In general, the stacking sequence [0/90〕_(2s) CFRP tubes absorbed more energy than other tubes, theoretical and experimental data were to be likely each other.
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[안전부문] 경량화용 복합재 박육부재의 축압과 특성에 관한 연구
박민엽(Minyeop Park),황재중(Jaejung Hwang),김영남(Youngnam Kim),정종인(Jongan Jeong),임광희(Inyoung Yang) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_2
When CFRP(Carbon Fiber Reinforced Plastics) composite thin-walled members are subjected to axial crushing loads, the response is complex and depends on the interaction between the different mechanisms that control the crushing process. In this study, it was conducted to determine whether the energy-absorption capability of CFRP composite tubes is a function of interlaminar number and orientation angle of outer. Tubes are composed of 4 types interlaminar number(k = 2, 3, 6 and 7) and included ply orientation angle of outer was 0 and 90. The collapse characteristics and energy absorption have been examined for various tubes. The results have been varied significantly as a function of ply orientation and interlaminar number
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김영남(Youngnam Kim),황재중(Jaejung Hwang),심재기(Jaeki Sim),양인영(Inyoung Yang) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
Currently, stacking condition related to the impact energy absorption of composite materials is being considered as an issue for the structural efficiency and safety of automobiles, aerospace vehicles. trains, ships and even elevators during collision. In particular, CFRP (carbon fiber reinforced plastics) composite materials have found wide applicability because of their inherent design flexibility and improved material properties. CFRP composite tubes were manufactured from uni-direction prepreg sheet in this paper. Chamfering one edge of the composite tubes could reduce the initial peak load without altering the sustained crushing load and prevent catastrophic failure in collapse situations. We performed static and dynamic impact collapse tests using a home-made impact test machine with vertical air-compression. The paper describes the energy absorption characteristics of CFRP composite tubes as a function of interlaminar number, ply orientation angle of outer and trigger.
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