Mechanical performance of bio-inspired hierarchical honeycomb metamaterials

辅助 材料科学 超材料 蜂巢 有限元法 复合材料 模数 变形(气象学) 蜂窝结构 变形机理 格子(音乐) 结构工程 微观结构 光电子学 工程类 物理 声学
作者
Mengchuan Xu,Zeang Zhao,Panding Wang,Shengyu Duan,Hongshuai Lei,Daining Fang
出处
期刊:International Journal of Solids and Structures [Elsevier BV]
卷期号:254-255: 111866-111866 被引量:41
标识
DOI:10.1016/j.ijsolstr.2022.111866
摘要

Natural materials with hierarchical structures usually have superior mechanical properties. Herein, inspired by the macro–micro coupling deformation characteristics of biomaterials, novel hierarchical auxetic-hexagonal honeycombs (AuxHex) metamaterials with various substructures, including equilateral triangles and double arrowheads lattice cells, were constructed. A universal analysis model of the plastic collapse stress was first established, considering the deformation behavior of both the primary and secondary structures. This mechanism-based method gets rid of redundant numerical fitting parameters, and is applicable to different hierarchical lattice structures. Typical hierarchical AuxHex specimens were prepared using selected laser melting and stainless steel. In-plane compression tests and finite element simulation results demonstrated that, in contrast to the regular structures, hierarchical honeycombs exhibit enhancement in their load-bearing capacities and energy absorption ability. The specific modulus of T-AuxHex and A-AuxHex were increased by about 180% and 45%, the specific strength rose by approximately 50% and 15%, and the specific energy absorption was improved by about 160% and 50%. The effects of geometrical parameters were systematically discussed to reveal the mechanisms underlying the enhancement of the above mechanical characteristics. The proposed theoretical model provides a new method for designing the mechanical properties of hierarchical metamaterials by tailoring the type and distribution of secondary structures.
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