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적층구성이 CFRP 사이드 부재의 충돌안전성에 미치는 영향
황우채 ( Woo Chae Hwang ),양인영 ( In Young Yang ) 한국안전학회(구 한국산업안전학회) 2014 한국안전학회지 Vol.29 No.3
The global demand for reduction in the weight of automobiles has led many countries to focus on the development of hybrid, eco-friendly, and electric cars. Reduction in the weight of materials can both increase fuel efficiency and maximize automobile performance. 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 circular and double hat shaped section was manufactured. The impact collapse tests performed with change of the stacking condition, such as variation of interface number and outerlayer angle. The impact collapse load and absorbed energy were quantitatively analyzed according to the changes in section shapes and stacking condition. This analysis was performed to obtain design data that can be applied in the development of optimum lightweight members for automobiles.
CFRP/Al 혼성 사각부재의 충격에너지 흡수 메카니즘의 실험적 고찰
황우채 ( Woo Chae Hwang ),차천석 ( Cheon Seok Cha ),양용준 ( Yong Jun Yang ),정종안 ( Jong An Jung ),양인영 ( In Young Yang ) 한국안전학회(구 한국산업안전학회) 2015 한국안전학회지 Vol.30 No.6
In this study, the collapse characteristic of CFRP/Al compound square tube was investigated experimentally. The conclusions are as follows; The impact collapse characteristic of CFRP/Al compound square tube was found to be the most superior stacking conditions [90°]8. It showed that a very stable collapse mode was crushing. In the member with [0°2/90°2]s and [90°2/0°2]s, stacking conditions, 0° fibers were splayed to the external by laminar bending, while the 90° fibers were held between the folds of the aluminum member by laminar bending, local buckling and transverse crack. In the member with [45°2/45°2]s stacking conditions, fibers were held between the folds of the aluminum member by local buckling and transverse crack.
단면형상이 다른 Al/CFRP 혼성박육부재의 축압궤특성
황우채(Woo Chae Hwang),이길성(Kil Sung Lee),차천석(Cheon Seok Cha),김지훈(Ji Hoon Kim),나승우(Seung Woo Ra),양인영(In Young Yang) 대한기계학회 2014 大韓機械學會論文集A Vol.38 No.9
본 연구에서는 Al/CFRP 혼성 구조부재가 승용차용 사이드부재에 사용될 것을 상정하여 Al/CFRP 혼성 구조부재의 단면형상의 변화, 최외각층의 변화가 압궤 특성에 어떠한 영향을 미치는가를 실험적으로 고찰하여 수송기계의 경량화를 위한 사이드부재로 사용될 수 있는 설계 데이터를 얻고자 하였다. 실험결과 다음과 같은 결론을 얻었다. 최외층각이 0°로 적층된 원형 Al/CFRP 혼성 충격 흡수부재가 사각 Al/CFRP 혼성 충격 흡수부재 보다 52,9%, 모자형 Al/CFRP 혼성 충격 흡수부재 보다 49.93% 높게 나타났으며, 최외층각이 90°로 적층된 경우 원형 Al/CFRP 혼성 충격 흡수부재 사각 Al/CFRP 혼성 충격 흡수부재 보다 50.49% , 모자형 Al/CFRP 혼성 충격 흡수부재 보다 49.2% 높게 나타났다. In the present study, we aimed to obtain design data that can be used for the side members of lightweight cars by experimentally examining the types of effects that the changes in the section shape and outermost layer of an aluminum (Al)/carbon fiber reinforced plastic (CFRP) composite structural member have on its collapse characteristics. We have drawn the following conclusions based on the test results: The circular Al/CFRP composite impact-absorbing member in which the outermost layer angle was laminated at 0° was observed to be 52.9 and 49.93 higher than that of the square and hat-shaped members, respectively. In addition, the energy absorption characteristic of the circular Al/CFRP composite impact-absorbing member in which the outermost layer angle was laminated at 90° was observed to be 50.49 and 49.2 higher than that of the square and hat-shaped members, respectively.
경량화 복합구조부재의 적층각도에 따른 충돌성능에 관한 연구
황우채 ( Woo Chae Hwang ),오영준 ( Young Jun Oh ),양인영 ( In Young Yang ) 조선대학교 공학기술연구원 2008 공학기술논문지 Vol.1 No.1
The recent trend of vehicle design is aimed at improving crash safety and environmentally-friendliness. For the former, energy absorbing members need to absorb sufficient collision energy, whereas for the latter, the vehicle structure must be lightweight in order to improve fuel efficiency and reduce tail gas emission. Therefore, the weight of the vehicle must be minimized while ensuring crash safety. In this study, composite structural members were manufactured using aluminium 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 were combined to exhibit the collapse characteristics of effective structural members. Quasi-static and impact axial collapse tests were carried out for the composite structural member, which comprised an aluminium member externally reinforced by stacking CFRP. In particular, among the design variables of the anisotropic CFRP, the axial collapse characteristics were examined according to the changes of orientation angle. The CFRP orientation angle was oriented in [+θn/-θn]s in order to examine the effect of CFRP orientation angle on the energy absorption characteristics. The orientation angle θ was set at 15°, 45° and 90°. The collapse mode of the composite structural member was determined by the CFRP orientation angle of the members, which influenced the member`s energy absorption capability.
황우채(Woo-Chae Hwang),서현경(Hyeon-kyeong Seo),이길성(Kil-Sung Lee),김지훈(Ji-Hoon Kim),양인영(In-Young Yang) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The most important objective in designing automobile is currently focus on environment-friendly, safety performance aspect. As for the environment-friendly and economical aspect, the issues are the overall movements toward lightweight automobile production. In this paper, based on the characteristics of square section member, the collapse characteristics and energy absorption capability of hat-shaped section members were analyzed. The axial static collapse tests were performed for each section members. The collapse modes and the energy absorption capability of the each section member were analyzed. The square sectional members which were composed of the aluminum, CFRP and hybrid were used and hat-shaped sectional members which were composed of the CFRP, hybrid were used by the specimens. In the collapse characteristics and energy absorption capability of the each member compared and they were analyzed.
정종안 ( Jong An Jung ),황우채 ( Woo Chae Hwang ) 조선대학교 공학기술연구원 2016 공학기술논문지 Vol.9 No.1
Important issues in the design of the vehicles could be represented such as reducing CO2 emissions and improving the fuel economy. However, vehicle safety is ensured in a state in which the design is to reduce the weight of vehicle weight reduction for the wings to be made. In this study, a representative of lightweight material CFRPs (carbon fiber reinforced plastic), thin-walled members using the CFRPs were studied after the collapse crash. Also, experimental investigations are carried out for the CFRP thin-wall member and in order to study the effect of various stacking condition. Static and impact collapse tests were performed with change of the interface numbers, such as fiber orientation angle. Collapse modes and energy absorption characteristics had been analyzed.