Abstract: Firstly,a hierarchical honeycomb structure is constructed by replacing each vertex of a regular hexagonal network with a smaller hexagon topology.Secondly,the dynamic response and energy adsorption property of hierarchical honeycombs subjected to explosive load are analyzed by using the finite element software LS-DYNA.Then,the influences of load condition and core-layer configuration on structure deformation and energy absorption are investigated.Finally,a comparison is made between the hierarchical honeycomb sandwich structure and the traditional one.The results show that ( 1) under low load,the deflection of the back panel of traditional aluminum honeycomb sandwich structure is relatively small,while under high load,the constructed hierarchical honeycomb sandwich structure possesses relatively small reflection and good impact resistance,and this superiority becomes obvious as load increases; ( 2) hierarchy parameter slightly affects the deflection of back panels but significantly affects the specific energy absorption of the core; and ( 3) the specific energy absorption of the core reaches the maximum when the hierarchy parameter is 0. 1.

Key words: hierarchical aluminum honeycomb sandwich structure, energy absorption property, impact resistance, dynamic response, explosive load