Elastically anisotropic architected metamaterials with enhanced energy absorption
Elastically anisotropic architected metamaterials with enhanced energy absorption
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DOI：
10.1016/j.tws.2023.111115
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发表时间：
2023-11
影响因子：
6.4
通讯作者：
Huan Jiang;B. Bednarcyk;Louise Le Barbenchon;Yanyu Chen
中科院分区：
文献类型：
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作者：
Huan Jiang;B. Bednarcyk;Louise Le Barbenchon;Yanyu Chen
高刚度、高强度和高能量吸收相结合的材料和结构被要求很高。目前的研究主要集中在这些力学性能的改善上，而没有考虑它们的方向相关性。在实践中，方向相关的力学性能对结构的完整性和性能至关重要，例如，在用于承载的各向异性骨支架和用于离子导电性的电池隔膜的应用中。最近，通过利用数据驱动的方法来剪裁微结构，获得了力学超材料中可调的各向异性刚度。然而，在大变形情况下起关键作用的吸能行为在很大程度上被忽略了。在这项工作中，我们提出了一种新型的弹性各向异性结构超材料(AAM)，该材料受当前锂离子电池隔膜多孔结构的启发而获得可调的各向异性，同时表现出优异的能量吸收能力。本文介绍的综合研究结合了实验研究和数值模拟，揭示了各向异性可以在很大范围内进行工程设计。与现有的两种晶格和壳基建筑材料相比，新开发的AAM的吸能能力分别提高了120%和13%。这项工作的发现为扩展现有的超材料设计空间提供了一种新的策略，有可能为需要方向相关的刚度和能量吸收的应用提供创新的解决方案。
Materials and structures featuring a combination of high stiffness, strength, and energy absorption are highly demanded. Current studies are focused on the improvement of these mechanical properties without considering their directional dependence. In practice, directional-dependent mechanical properties are crucial to structural integrity and performance, for instance, in the application of anisotropic bone scaffolds for load bearing and battery separators for ion conductivity. Recently, tunable anisotropic stiffness in mechanical metamaterials has been obtained by tailoring the microstructures using data-driven approaches. However, energy absorption behavior, which plays a critical role in the presence of large deformation, has largely been neglected. In this work, we propose a new type of elastically anisotropic architected metamaterials (AAMs) inspired by the current lithium-ion battery separator porous microstructure to acquire tunable anisotropy while exhibiting superior energy absorption. The integrated study presented herein, which combines an experimental investigation with numerical simulations, reveals that the anisotropy can be engineered across a broad range. Compared with two existing lattice and shell-based architected materials, it is shown that the energy absorption of the newly developed AAMs is increased by 120% and 13%. The findings in this work provide a new strategy to expand the existing metamaterial design space, with the potential to enable innovative solutions for applications where directional-dependent stiffness and energy absorption are needed.