Abstract: Three simulation modeling methods, namely Beam unit, Shell unit and Solid unit (Beam, Shell and Solid) were adopted respectively based on the failure theory of metal materials to propose an appropriate simulation analysis method to simulate the force condition and failure mode of the car body mounting system in vehicle collision accidents. The simulation analysis was carried out with LS-DYNA software on the force condition of the car body mounting system in the collision, and the simulation accuracy was evaluated in the real car collision tests. The results show that for shear and compression type suspension systems, the simulation analysis method combining Beam and Solid can accurately reflect the force condition and failure mode of the car body suspension system in real car collision accidents. Therefore, the simulation analysis method combining Beam with Solid can be applied to guide the design and development of car body mounting system in the process of car model research and development.

Key words: vehicle crash, vehicle mounts, simulation and analysis, failure mode