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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.
CFRP 이중 모자형 단면부재의 계면수 변화에 따른 충격압궤거동 평가
황우채(Woochae Hwang),차천석(Cheonseok Cha),양인영(Inyoung Yang) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
This study is to experimental investigations are carried out for CFRP double hat shaped section members in order to study the effect of various stacking condition and shape of section. Impact collapse tests were performed with change of the stacking condition, such as fiber orientation angle and shape of section. Collapse mode and energy absorption characteristics were analyzed. The CFRP double hat shaped section members which manufactured from unidirectional prepreg sheets were made of 8ply. The collapse mode and energy absorption characteristics were analyzed for CFRP double hat shaped section member according to the interface numbers(2, 3, 4, 6 and 7) and outerlayer(90°, 0°)
황우채(Woochae Hwang),이길성(Kilsung Lee),차천석(Cheonseok Cha),정종안(Jongan Jung),한길영(Gilyoung Han),양인영(Inyoung Yang) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.1
Ultimate goals in vehicle design can be summarized as environment-friendliness and safety. Along with these requirements, the importance of natural environment conservation has been focused lately. Therefore, reduced emission from vehicle and improved efficiency has become the top priority projects throughout the world. CFRP(Carbon Fiber Reinforced Plastics) of the advanced composite materials as structure materials for vehicles, has a widely application in lightweight structural materials of air planes, ships and automobiles because of high strength and stiffness. This study is to investigate the energy absorption characteristics of CFRP hat-shaped section members under the axial impact collapse test. The CFRP hat-shaped section members which manufactured from unidirectional prepreg sheets were made of 8plies. The axial impact collapse tests were carried out for each section members. The collapse mode and energy absorption characteristics were analyzed for CFRP hat-shaped section member according to the interface numbers(2, 3, 4, 6 and 7)
경량화용 CFRP 모자형 구조부재의 적층각도 변화에 따른 압궤특성
황우채(Woochae Hwang),양용준(Yongjun Yang),양인영(Inyoung Yang) 한국생산제조학회 2012 한국생산제조학회지 Vol.21 No.6
CFRP of the advanced composite materials as structure materials for vehicles has a widely application in lightweight structural materials of air planes, ships and automobiles because of high strength and stiffness compared with conventional materials. This study is to investigate the energy absorption characteristics and collapse mode of CFRP single and double hat shaped structural member under the axial static collapse test. The CFRP single and double hat shaped structural members stacked at different angles (±15°, ±45°, ±90°, 90°/0° and 0°/90° where the direction on 0° coincides with the axis of the member). The axial static collapse tests were carried out for each member. Collapse mode and energy absorption characteristics of the each member were analyzed.
경량화용 CFRP 모자형 단면 부재의 충돌 압췌특성에 관한 연구
황우채(Woochae Hwang),차천석(Cheonseok Cha),양인영(Inyoung Yang) 한국자동차공학회 2008 한국자동차공학회 지부 학술대회 논문집 Vol.2008 No.11
Currently, the most important purpose in designing automobile is environment-friendly and safety performance aspect. However, the vehicle structure must be lightweight in order to improve fuel efficiency and reducing exhaust fumes. Therefore, the design of automobile should be inclined towards the safety aspects. but at the same time, it also consider reducing the structural weight of an automobile. In this study, CFRP side members with hat-shaped section was manufactured. The impact collapse tests performed with change of the stacking condition, such as interlaminar. The collapse mode and energy absorption capability were analyzed according to interlaminar number.
계면수 변화에 따른 Al/CFRP 혼성구조부재의 에너지 흡수 특성
서현경(HyeonKyeong Seo),황우채(Woochae Hwang),민한기(Hanki Min),임광희(kwanghee Im),양인영(Inyoung Yang) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The aluminum or CFRP is representative of light-weight materials. The aluminum tubes absorb energy by stable plastic deformation and the CFRP tubes absorbs energy by unstable brittle failure with higher specific strength and stiffness. Based on the respective collapse characteristics of aluminum and CFRP tubes, the aluminum CFRP compound tubes were manufactured to get a synergy effect when the aluminum CFRP tubes were combined with the advantages of each tube. This paper is to investigate the collapse characteristics of square or circular shaped aluminum CFRP compound tubes subjected to quasi-static axial collapse tests which were conducted by changing the stacking conditions. The aluminum CFRP compound tubes were made of8 layers of these sheets and they are stacked at different interlaminar numbers with outer orientation angle 90°, due to better collapse characteristics than that with 0 degrees. Test results showed that the collapse of the aluminum CFRP tubes complemented unstable brittle failure of the CFRP tube due to the ductile characteristics of the inner aluminum tube. It turned out that interlaminar numbers of aluminum CFRP compound tubes have no influence on the energy absorption and collapse modes of the tubes.
다양한 열습환경하에서 최외각층 변화에 따른 CFRP 모자형 부재의 압궤특성
양용준(Yongjun Yang),황우채(Woochae Hwang),양인영(Inyoung Yang) 한국생산제조학회 2014 한국생산제조학회지 Vol.23 No.3
Currently, CFRP composites are rapidly replacing steel plates, as they are lighter, stronger, and more elastic; however, they are poorly suited to hygrothermal and impact-collapsed environments because moisture can alter their molecule arrangement and chemical properties. In this study, environments are experimentally simulated in order to investigate changes in the moisture absorption inside a CFRP composite and to determine its weakest point. Moreover, changes in the moisture absorption ratio at temperatures of 60°C and 80°C are studied and compared in order to understand how changes in temperature affect moisture absorption inside CFRP composites. Results show that moisture absorption leads to a strength reduction of around 50%. In addition, the moisture absorption rate inside CFRP composites is shown to change rapidly with increasing temperature. Accordingly, it showed that the change in matrix also has a weak point.
이길성(Kilsung Lee),양용준(Yongjun Yang),박준우(Junwoo Park),황우채(Woochae Hwang),김정호(Jungho Kim),서현경,양인경(Inyoung Yang) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Aluminum members under axial load absorb energy through sustained plastics deformation. However, CFRP (Carbon Fiber Reinforced Plastics) members absorb energy through uneven brittle failure. On the other hand, CFRP has higher specific stiffness and specific strength as compared to aluminum members. This study examines collapse characteristics of aluminum composite compound structural member. Since CFRP is an anisotropic material, its collapse characteristics change according to orientation. Therefore, CFRP collapse characteristics have been evaluated against orientation angle and thickness. Collapse mode of the combined CFRP aluminum member has been determined by orientation angle of the CFRP where it was steadily collapsed under high load. In addition, it was demonstrated that energy absorption is dependent upon orientation angle and thickness.