Abstract:The structural design and optimization method of the octagonal beam with step by step energy absorbing characteristics were introduced.The finite element model of the beam was developed and validated through sled test.Uniform design method was used to set the scheme of the impact simulation of the beams with different thickness.The crashworthiness regression formulations were defined on the basis of the simulation results,and regression analyses were conducted.The Genetic Algorithm(GA) was used in the multi...