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에너지 흡수 제어에 의한 Al 박육부재의 축 압궤 특성
양용준(Yongjun Yang),황창숙(Changsook Hwang),김선규(Sunkyu Kim),심재기(Jeaki Sim),양인영(Inyoung Yang) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Automobiles must be designed to control characteristics of energy absorption for the protecting of passengers in a car accident. Study on collapse characteristics of structural member is conducted in parallel with other studies on effective energy absorption capacity of structural members with diverse cross-sectional shapes and various materials. This study concerns the crashworthiness of the widely used vehicle structural members, thin-walled tubes, which are excellent on the point of the energy absorption capacity. The absorbed energy, mean collapse load and deformation mode were analyzed for side member which absorbs most of the collision energy. The Energy Absorption Capacity of AI thin-walled tubes have been estimated on cases of with-controller and without-controller, respectively based on height, thickness of an controller. The absorbed energy and mean collapse load of thin-walled tubes was increased by 15-20% in using the controller and energy absorbing capability of the specimen was slightly changed by change of the high controller's height.
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.