In-plane crushing behavior of hierarchical-gradient honeycomb structure
Four kinds of honeycomb structures with hierarchical-gradient characteristics were developed by introducing secondary struc-tures into hexagonal cells layer by layer.The numerical simulation of the in-plane crushing performance of four kinds of honeycomb struc-tures with hierarchical-gradient configuration was conducted using ABAQUS/Explicit finite element software.The results show that the in-troduction of hierarchical-gradient can effectively control the formation and development of deformation bands in honeycomb structures un-der quasi-static loading,which results that the crushing failure processes of cells with different hierarchical orders manifest in the macro-scopic mechanical response of the hierarchical-gradient honeycomb structures with different platform stress levels.Combining with the me-so deformation mechanism,the influence laws of impact velocity and cell wall thickness on the crushing response and energy absorption performance of hierarchical-gradient honeycomb structures were analyzed.Under low velocity impact,the symmetric hierarchical-gradient honeycomb structure with high order in middle and low order in both ends cell arrangement exhibits excellent energy absorption perform-ance,and the specific energy absorption is increased by 95.66%compared with that of traditional honeycomb structure.Under high veloc-ity impact,the gradient design of different hierarchical cells can improve the energy absorption performance of honeycomb structure,which makes the crushing process of energy-absorbing structure be effectively regulated.
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