Abstract: To solve the issue on topology optimization of crashworthy frame structures design of vehicle body,a crashworthy topology optimization method based on energy controlled behavior in Hybrid Cellular Automaton(HCA) was proposed.Applied LS-DYNA explicit FEM,Hybrid Cellular Automaton (HCA) was taken as computational model and the local change in the design variable was determined by local control rules.In topology domain two connected subdomains were defined:a flexible subdomain and a stiff subdomain with constraint of different design dimensions,mass fraction and energy controlled behavior.Then the topology optimization on single load case and multiple load case were designed to verify the feasibility and accuracy of this approach.Finally,a bumper-like design was taken as an example and the crashworthy was proved to be increased,which promised a high engineering practicability.

Key words: crashworthy, topology optimization, energy controlled, Hybrid Cellular Automaton (HCA)