Abstract
To enhance the impact resistance of honeycomb structures, this article proposes a novel self-similar nested honeycomb structure (SNHRH) by incorporating self-similar ribs within the honeycomb framework. Finite element simulations and experimental validations were conducted using Abaqus software. The results from the out-of-plane crushing tests demonstrate that the SNHRH exhibits superior energy absorption capabilities compared to conventional honeycomb structures, hierarchical multifunctional chiral metamaterials, and spider-web hierarchical honeycombs. Furthermore, the enhanced energy absorption characteristics of the SNHRH-1 are not merely attributable to the incorporation of internal cytokinetic elements; rather, they arise from the interactions among these internal components, which result in more pronounced plastic deformation at the intersections. To further elucidate the impact of geometric parameters on the crashworthiness of the proposed honeycomb structure, this study analyzes the significant effects of relative density, rib angle, and thickness ratio distribution. The accuracy of the finite element simulation results was verified through compression tests. The findings indicate that relative density is positively correlated with energy absorption, specific energy absorption, initial peak crash force, and crushing force efficiency. An increase in relative density corresponds to higher energy absorption and specific energy absorption while maintaining constant wall thickness. Notably, within the same type of honeycomb structure, higher orders exhibit improved energy absorption performance. Specifically, the energy absorption of SNHRH-4 was found to be 88.63% greater than that of SNHRH-1.
Published Version
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