Abstract As ordered cellular materials, lattice materials are excellent lightweight candidates for impact energy/shock absorbing applications. This study aims to explore an advanced lattice material with objective of maximum energy absorption based on topology optimisation. Effects of cell-wall material and mass fraction on topological results are analysed. Generally, a cuttlebone-like lattice (CLL) material is obtained and its deformation behaviour and compressive properties under impact loads are investigated. The results show that the CLL material undergoes a buckling-dominated and layer-by-layer deforming process, irrespective of cell-wall materials and relative densities. The compressive properties of the as-designed lattice material versus relative density can be described by the Gibson-Ashby power law. Impressively, the CLL material outperforms a broad range of existing cellular materials in terms of relative collapse strength, relative elastic modulus and specific energy absorption, which are significantly enhanced by 141.96%, 203.01% and 174.06%, respectively, comparing with Octet lattice material. It is expected that this newly designed lattice material with tailored mechanical properties can act as an excellent impact energy/shock absorber.

中文翻译：

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基于拓扑优化的高能量吸收先进晶格材料

摘要 作为有序的蜂窝材料，晶格材料是冲击能量/减震应用的极好轻量级候选材料。本研究旨在探索一种基于拓扑优化的以最大能量吸收为目标的先进晶格材料。分析了细胞壁材料和质量分数对拓扑结果的影响。通常，获得类墨鱼骨晶格 (CLL) 材料，并研究其在冲击载荷下的变形行为和压缩性能。结果表明，无论细胞壁材料和相对密度如何，CLL 材料都经历了屈曲主导的逐层变形过程。设计的晶格材料的压缩特性与相对密度的关系可以通过 Gibson-Ashby 幂律来描述。令人印象深刻的是，CLL 材料在相对坍缩强度、相对弹性模量和比能量吸收方面优于广泛的现有蜂窝材料，与 Octet 晶格材料相比，分别显着提高了 141.96%、203.01% 和 174.06%。预计这种新设计的具有定制机械性能的晶格材料可以作为出色的冲击能量/减震器。