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All car manufactUrersare recently required to develop the engine − hood fbr the purpose ofprotecting pedestrian heads」 t is important to control the acceleration time history at the initial stage and late stage f〈)r pedestrian head protection ． The engine − hood fbr pedestrian head protection needs to control bcal rigidity and whole rigidity by just one structure ・ To solve this problem we focus on inner panels which have a dominant ro］ e in absorbing energy ． This stUdy also aimed to evaluate that impact characteristics of inner panels adopting ZETA − stiffened panels improve pedestrian head protection by numerical

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