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고온 고습 환경 하에서의 적층각도 변화를 갖는 CFRP 모자형 단면부재의 강도저하 평가
양용준(Yongjun Yang),심재기(Jaeki Sim),양인영(Inyoung Yang) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
CFRP(Carbon Fiber Reinforced Plastic) has light weight and high strength. CFRP composite material features superior heat and corrosion resistance, and these benefits enables the gradual applications on aerospace industries and sports-entertainment business. Exceptional corrosion resistance enables the acceptance in maritime structural members such as ship and oil-drilling machineries. However, CFRP composite material has the weakness in hygrothermal environment and shock resistance. Especially, moisture ingress into composite material under hygrothermal environment can change molecule arrangement and chemical properties. In addition, interface characteristics and component material properties can be degraded. Therefore, structural members with hat-shaped section, which are adopted in the actual automobile vehicle, were prepared for different stacking configurations. Moisture absorption characteristics and strength evaluation was empirically conducted after long-term exposure of differently stacked CFRP hat-shaped section member under hygrothermal environment. We have made a impact collapse experiment to research into the difference of absorbed energy and deformation mode between moisture absorbed specimen and non-moisture absorbed. As a result, the effect of moisture absorption and impact loads of approximately 50% reduction in strength are shown.
경량화용 Hybrid 사각 복합구조부재의 충돌 거동 평가
황우채(Woochae Hwang),서현경(Hyeonhyeong Seo),심재기(Jaeki Sim),한길영(Gilyoung Han),양인영(Inyoung Yang) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In this study, the Hybrid square composite structural members were manufactured using aluminum and Carbon Fiber Reinforced Plastics (CFRP) which are representative lightweight materials. The disadvantages of aluminum and CFRP members were considered to be mutually complimentary while the advantages of each member were combined to exhibit collapse characteristics of effective structural members. Impact axial collapse tests were carried out for the compound members, which comprised an aluminum member externally reinforced by stacking CFRP.
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.
김지훈(Jihoon Kim),이현(Hyun Lee),심재기(Jaeki Sim),양인영(Inyoung Yang) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.5_2
In this paper, an investigation was perfonned on the dynamic interlaminar fracture toughness of CFRP(carbon fiber reinforcement plastics). Specimens used in this experiment are CF/PEEK laminated plates. In this experiments, Split Hopkinson's Bar (SHPE) test was applied to dynamic and notched flexure test. The mode II fracture toughness of each unidirectional CFRP was estimated by the analyzed deflection of the specimen and J-integral with the measured impulsive load and reactions at the supported points. As an experimental result, the vibration amplitude of [0 /F₄/0] laminates appear more than that of[ 0/F₂/0] laminates for the J-integral and displacement velocity at a measuring point. Also, it is thought that the dynamic fracture toughness of two kind specimen(CF/PEEK) with the increase of displacement velocity becomes great at a measuring point with in the range of measurement<br/>
곡률을 갖는 복합재 적층쉘의 적층구성에 따른 경사관통특성
조영재(Youngjea Cho),박병연(Byungyeon Park),양해진(Haejin Yang),김영남(Youngnam Kim),심재기(Jaeki Sim),양인영(Inyoung Yang) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In this paper, this study aims at the evaluation on the characteristics of CFRP laminate shells using a penetration impact test. Carbon fiber reinforced plastics of the advanced composite materials as structural materials for transportation vehicles has a wide application in light weighs structure materials of airplanes, ships and automobiles because of high strength and stiffness. They are stacked to [0₂/90₂]S and [+45₂/-45₂]S their inter laminar number two. When the specimen is subjected to transverse impact by a steel ball, the velocity of the steel ball was measured both before and after impact by determining the time for it to pass two ballistics-screen sensor located a known distance apart. In general, the critical penetration energy increased as the curvature increased, interface decrease and slope angle on the impact surface increased.
경량화용 Al/CFRP 사각부재의 적층각에 따른 충격압궤특성
이길성(Kilsung Lee),차천석(Cheonseok Cha),정진오(Jinoh Chung),임광희(Kwanghee Im),심재기(Jaeki Sim),양인영(Inyoung Yang) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
In this study, the Al/CFRP structural members which are composed of square shaped aluminum members wrapped with CFRP (Carbon Fiber Reinforced Plastics) outside were manufactured to get a synergy effect when the Al/CFRP member is combined with the advantages of each members, such as energy absorption by the stable folding deformation of the aluminum member and by the high specific strength and stiffness of the CFRP member. The impact collapse tests were performed for the Al/CFRP members. Because the CFRP is an anisotropic material whose mechanical properties, such as strength and elasticity, are changed with its fiber orientation angle, special attention was given to the effects of the fiber orientation angle of CFRP on the collapse characteristics of the Al/CFRP members.