关键词: 防撞主梁, 仿生设计, 残余冲击力, 吸能量, 比吸能

Abstract: The front anti-collision beam is an important protective component for safe driving of automobiles, and the cross section shape of main beam is the main factor affecting the characteristics of energy absorption. In this paper, three bionic cross-section structures of crash-proof girder are proposed based on bionic principle to study the impact of crash-proof girder, and a three-point bending dynamic mechanical model is established. Through collision simulation of anti-collision main girder with LS-DYNA software, the deformation and crushing of each anti-collision main girder are obtained. In order to further study the differences of crash performance of each anti-collision girder, the characteristics of impact force and specific absorption during the collision process are further compared and analyzed. The results show that the impact performance of the embedded water drop shaped anti-collision main beam is the best, its maximum residual impact force is 3 062 N, the final energy absorption is 738 kJ, and it has good specific energy absorption characteristics.