동적 구성방정식을 적용한 자동차 차체 구조물의 충돌 특성 분석

Abstract

The crashworthiness of vehicles with finite element method depends on the geometry modeling and material properties. In order to ensure the impact characteristics of auto-body structures by a finite element method, the dynamic behavior of sheet metals must be examined. in this paper, high strain rate tensile tests have been carried out with a tension type split Hopkinson bar apparatus specially designed for sheet metals. Simulation fo auto body structures has been carried out by an elasto-plastic finite element method with explicit time integration. The crashworthiness of auto-body structures analyzed with quasi-static constitutive relation is compared with the one with rate dependent constitutive model. The frontal frames and a square tube used in numerical simulation. The impact characteristics such as the deformed shapes and the impact energy absorption of auto-body structures are investigated with the variation of the strain rate.