Abstract While lattice metamaterials can achieve exceptional energy absorption by tailoring periodically distributed heterogeneous unit cells, relatively little focus has been placed on engineering heterogeneity above the unit-cell level. In this work, the energy-absorption performance of lattice metamaterials with a heterogeneous spatial layout of different unit cell architectures was studied. Such multi-morphology lattices can harness the distinct mechanical properties of different unit cells while being composed out of a single base material. A rational design approach was developed to explore the design space of these lattices, inspiring a non-intuitive design which was evaluated alongside designs based on mixture rules. Fabrication was carried out using two different base materials: 316L stainless steel and Vero White photopolymer. Results show that multi-morphology lattices can be used to achieve higher specific energy absorption than homogeneous lattice metamaterials. Additionally, it is shown that a rational design approach can inspire multi-morphology lattices which exceed rule-of-mixtures expectations.

中文翻译：

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多形态晶格提高了塑性能量吸收

摘要 虽然晶格超材料可以通过定制周期性分布的异质晶胞来实现卓越的能量吸收，但相对较少的注意力放在晶胞水平以上的工程异质性上。在这项工作中，研究了具有不同晶胞结构的异质空间布局的晶格超材料的能量吸收性能。这种多形态晶格可以利用不同晶胞的不同机械性能，同时由单一基础材料组成。开发了一种合理的设计方法来探索这些晶格的设计空间，激发了一种非直观的设计，该设计与基于混合规则的设计一起进行评估。使用两种不同的基材进行制造：316L 不锈钢和 Vero White 光聚合物。结果表明，多形态晶格可用于实现比均质晶格超材料更高的比能量吸收。此外，还表明合理的设计方法可以激发超出混合规则预期的多形态晶格。