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RISS 인기검색어
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- 저자 : 김종섭(Jongseub Kim) (검색결과 2 건)
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하중 조건의 미세한 변화에 따른 비대칭 모자형 사각관의 붕괴 거동
김진성(Jinsung Kim),임지호(Jiho Lim),허훈(Hoon Huh),김종섭(Jongseub Kim),정태현(Taehyun Jung) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Hat-type rectangular tube is a common structural member of an auto body, usually a front side member. The front side member is an important part in absorbing the crash energy of frontal car crash. In frontal car crash the front side member should absorb the crash energy as much as possible to minimize the deformation of the passenger room. The front side member usually has a so-called hat shaped cross-section which is known to show better energy absorption efficiency than the square tube with same cross sectional area. Crash worthiness of the front side member is studied with hat-type specimens that are idealized shape of the front side member. In this research, asymmetric hat-type specimens were studied. Static and dynamic crush tests were performed with five types' of asymmetric hat-type specimen. The collapse modes show very arbitrary collapse profile even if the final energy absorptions are not so much dispersed. In this paper, finite element analysis of asymmetric hat-type specimen was performed with the small error of loading condition, describing errors in specimen specification, loading angle and experimental process. Slight error in the loading angle was considered in the finite element analysis of asymmetric hat-type specimen. The result of finite element analysis shows arbitrary collapse mode also. And this result is suggestive in estimating the efficiency of crash energy absorption during the car crash.
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비대칭 모자형 사각관의 정적 및 동적 압궤실험을 통한 충돌성능 평가
김진성(Jinsung Kim),임지호(Jiho Lim),허훈(Hoon Huh),김종섭(Jongseub Kim),정태현(Taehyun Jung) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The axial crush of channeled members is important in estimation of the energy absorption during the car frontal crash. In order to improve the energy absorption capacity and the velocity deceleration factor of an auto-body, the front-side members are mounted at the side of the engine room and made undergo the axial crush at the beginning of the car crash. There have been so many studies about square or rectangular boxes and hat-type specimens for the axial crush both experimentally and analytically while there are few studies about asymmetric hat￢type specimens that are used for designated deformation. The axial crush of asymmetric hat-type specimens is, however, difficult to describe analytically with the kinematic crush mechanism. In this paper, asymmetric hat-type specimens are fabricated by spot welding or laser welding with different spacing between two welded spots. The specimens are then deformed for the axial crush at the various crush velocity. The experimental result shows that the specimens are not deformed in a consistent manner, but arbitrarily. In this type of axial crush, the length of the flange region is an important parameter as well as the spacing between welded spots. Experimental results also show the difference in the crush mode between the spot-welded specimens and the laser-welded ones. The difference in the first peak and average load is also demonstrated as well as the energy absorption capacity.
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