| Summary: | 碩士 === 大葉大學 === 機械與自動化工程學系 === 104 === In vehicle-pedestrian impacts, the severity of pedestrian injuries are affected by vehicle hood. The structure and material of the hood is believed that strongly effect on pedestrian head injury. Therefore, the improvement design of hood structures has a great help for reducing pedestrian head injuries. In order to reduce injuries of pedestrians in case of accident, the aluminum foam as a hood material is proposed in this study. This study constructs the finite element model of headform impactors and pedestrian friendliness of a vehicle hood using LS-DYNA software based on the EEVC WG17 regulation. Firstly, the geometry models of child and adult headform impactors are created in CAD software Pro / Engineer. The mesh generation of geometry model is performed using Hypermesh as a preprocessor for finite element analysis. Then, the study used finite element code to evaluate the pedestrian friendliness of a vehicle hood according to the EEVC WG17 test method and criterion. Finally, aluminum foam is applied on the hood structure for minimizing pedestrian head injury. To confirm the feasibility of aluminum foam as a hood material, the resultant acceleration of head center of gravity and HIC value are measured, and the results of new hood material are compared with the original material. The simulation results indicate that the proposed new hood material has high energy-absorbing capabilities and advantage of weight reduction. The results obtained in this study may serve as a useful reference for designers on future development of car hood. Furthermore, the finite element model of headform impact tests can be useful to evaluate pedestrian's head safety in collision with the hood.
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