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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.
혼성 알루미늄 CFRP 원형튜브의 축 압궤거동과 에너지흡수 특성
이길성(Kilsung Lee),차천석(Cheonseok Cha),정진오(Jinoh Chung),양인영(Inyoung Yang) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Aluminum tube absorbs energy by stable plastic deformation under axial loading. While CFRP(Carbon Fiber Reinforced Plastics) tube absorbs energy by unstable brittle failure but its specific strength and stiffness is higher than that of aluminum tube. In this study, for complement of detect and synergy effect by combination with the advantages of each member, the axial collapse tests were performed for combined aluminum CFRP tubes which are composed of aluminum tubes wrapped with CFRP outside aluminum circular tubes. Test results were compared with that of aluminum tubes and CFRP tubes. Crushing behavior and energy absorption characteristics were analyzed for combined circular tubes which have different CFRP orientation angle and thickness.
Al/CFRP 혼성튜브의 적층각에 따른 축방향 압궤 특성
이길성(Kilsung Lee),차천석(Cheonseok Cha),김정호(Jeongho Kim),정진오(Jinoh Chung),김선규(Sunkyu Kim),양인영(Inyoung Yang) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Aluminum materials have been widely used in various vehicle structures. If composite materials are applied to vehicle structures, it is expected that not only the weight of the vehicle is decreased but also it absorb large amounts of energy. Aluminum tubes are lower than CFRP (Carbon Fiber Reinforced Plastics) tubes in the collapse load but absorb energy by stable plastic deformation. On the other hand, CFRP tubes are higher than aluminum tubes in the collapse load but absorb energy by unstable brittle failure. The combination of aluminum and composite may result in stable deformation and excellent energy absorption efficiency. The compressive axial collapse tests were performed to investigate collapse characteristics of Al/CFRP compound tubes which are aluminum tubes wrapped with CFRP outside the aluminum circular and square tubes. Based on collapse characteristics of aluminum tubes and CFRP tubes respectively, the axial collapse tests were performed for Al/CFRP compound tubes which have different CFRP orientation angles. Test results showed that Al/CFRP compound tubes supplemented the unstable brittle failure of CFRP tubes due to ductile nature of inner aluminum tubes. In the light-weight aspect, Absorbed energy per unit mass of circular tubes was higher than square tubes'. Absorbed energy per unit mass showed highest when CFRP orientation angle was 90 degrees.