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벽면 충돌에 있어서 힘-변형 관계를 이용한 에너지 변화의 계산
장인식(I.S.Jang),이상묵(S.M.Lee) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
The deformation energy is one of the major factors for the conjecture of crash configuration in car accident reconstruction. The methodology for calculating a deformation energy during barrier impact is developed using force-deformation relationship. At first, linear equations for velocity-crush and force-crush relationship are derived to verify the effectiveness of finite element model. When compared with the test result, the approximation error is small. The deformation energy is calculated in two ways: One. integration of force-deformation curve up to residual crush: the other, consideration of dynamic crush and restitution effect. The computed energy shows reasonably good accuracy compared with the result evaluated by finite element analysis.<br/>
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/>