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모자형 단면부재의 폭비와 플랜지 용접간격에 따른 압궤특성
차천석,강종엽,김영남,김정호,김선규,양인영,Cha, Cheon-Seok,Gang, Jong-Yeop,Kim, Yeong-Nam,Kim, Jeong-Ho,Kim, Seon-Gyu,Yang, In-Yeong 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.1
The fundamental and widely used spot welded sections of automobiles (hat and double hat-shaped section members) absorb most of the energy in a front-end collision. The sections were tested on axial static(10mm/min) and quasi-static(1000mm/min) loads. Based on these test results, specimens with various thickness, shape and spot weld pitch on the flange have been tested with impact velocity(7.19m/sec) the same as a real life car clash. Characteristics of collapse have been reviewed and a structure of optimal energy absorbing capacity is suggested.
차체구조부재용 알루미늄 CFRP 혼성사각부재의 축 압궤 특성
이길성,차천석,편석범,양인영,심재기,Lee, Kil-Sung,Cha, Cheon-Seok,Pyeon, Seok-Beom,Yang, In-Young,Sim, Jae-Ki 대한기계학회 2005 大韓機械學會論文集A Vol.29 No.10
An aluminum or CFRP (Carbon Fiber ReinfDrced Plastics)is representative one of light-weight materials but its axial collapse mechanism is different from each other. The aluminum member absorbs energy by stable plastic deformation, while the CFRP member absorbs energy by unstable brittle failure with higher specific strength and stiffness than those in the aluminum member. In an attempt to achieve a synergy effect by combining the two members, aluminum CFRP compound square members were manufactured, which are composed of aluminum members wrapped with CFRP outside aluminum square members with different fiber orientation angle and thickness of CFRP, and axial collapse tests were performed fur the members. The axial collapse characteristics of the compound members were analyzed and compared with those of the respective aluminum members and CFRP members. Test results showed that the collapse of the aluminum CFRP compound member complemented unstable brittle failure of the CFRP member due to ductile characteristics of the inner aluminum member. The collapse modes were categorized into four modes under the iuluence of the fiber orientation angle and thickness of CFRP. The absorbed energy Per unit mass, which is in the light-weight aspect was higher in the aluminum CFRP compound member than that in the aluminum member and the CFRP member alone.
최적 충격특성에 갖는 차체구조용 점용접 박육단면부재의 개발 -충격속도변화에 따른 압궤특성을 중심으로-
양인영,차천석,강종엽,Yang, In-Yeong,Cha, Cheon-Seok,Gang, Jong-Yeop 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.7
This paper concerns the crashworthiness of the widely used vehicle structure, the spot welded hat and double hat shaped section members, which are excellent on the point of the energy absorbing capacity and low production cost. The target of this paper is to analyze the energy absorption capacity of the structure against the front-end collision, and to obtain useful information for designing stage. Changing the spot weld pitches on the flanges, the hat and double hat shaped section members were tested on the axial collapse loads in impact velocities of 4.72m/sec, 6.54m/sec, 7.19m/sec and 7.27m/sec. To efficiently review the collapse characteristics of these sections, the simulation have been carried out using explicit FEM package, LS-DYNA3D. The solutions are compared with results from the impact collapse experiments.
고온.고습 환경 하에서의 계면수 변화에 따른 CFRP모자형 단면 부재의 압궤특성
양용준,차천석,양인영,Yang, Yong-Jun,Cha, Cheon-Seok,Yang, In-Young 한국생산제조학회 2009 한국생산제조학회지 Vol.25 No.4
It is important to satisfy the requirements and standards for the protections of passengers in a car accident. There are lots of studies on the crushing energy absorption of a structure members in automobiles. We have studied to investigate collapse characteristics and moisture absorption movements of CFRP(Carbon Fiber Reinforced Plastics) hat shaped sectional members when CFRP laminates are under the hygrothermal environment. In particular, the absorbed energy, mean collapse load and deformation mode were analyzed for side members which absorbed most of the collision energy. Variation of CFRP interlaminar numbers is important to increase the energy absorption capability. Therefore we have made a static collapse experiment to research into the difference of absorbed energy and deformation mode between moisture absorbed specimen and non-moisture absorbed.