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張仁植,蔡德秉 홍익대학교 산업기술연구소 1999 産業技術 Vol.9 No.-
The passenger safeties become more important issue as the car industry develops. Auto doors play a great role to protect passengers from side car collision accidents. Side impact bars have been utilized to reinforce the stiffness of doors. In this study, the polyurethane foam materials are used to increase the stiffness and impact energy absorption performance. The side impact analysis between door and circular pole is carried out using LS-DYNA3D. The polyurethane foam material shows better ability than the conventional impact bar in absorbing the impact energy. Higher density foam materials deforms less than lower density foam materials, but the trends is an opposite way for the acceleration point of view.
[구조강도부문] 충돌사고 재구성을 위한 차체 변형형상의 수치 모델 개발
장인식(In-Sik Jang),채덕병(Duck-byoung Chae) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The deformation pattern is one of the major factors to resume the crash configuration in collision accident reconstruction. Crash analysis are carried out using finite element method and deformed shapes are enumerated for different crash conditions. Linear equation representing force-deformation relationship is derived and deformation energy is calculated. This energy can be utilized as one of indices to identify the type of the collision accident result. Crash analysis between two vehicles is accomplished with three crash angles and three velocities for each angle condition. The deformations are measured for six selected points and numerical models are obtained for two dimensional deformation patterns by least square curve fitting. Quadratic and cubic polynomials are used as trial functions, and the fitted curves approximate deformation shapes with reasonable errors.
장인식(I.S.Jang),이상묵(S.M.Lee),채덕병(D.B.Chae) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
Three kinds of crash analysis between two cars are carried out using developed equivalent finite element model. The geometric model of a dormestic car is made and meshes are generated using HYPERMESH and FEMB, and the analyses are carried out using DYNA3D. Three crash configurations are established; 50% offset frontal crash, side crash and 45 degree oblique crash. Four equivalent models are developed by substituting beam element and mass element for shell element according to the crash configurations. The displacement and internal energy are compared for each equivalent model, and the results from mass element model are close to those of full model. The computation time is reduced by around 40% using equivalent model.<br/>