Oligomodal metamaterials with multifunctional mechanics

This dataset contains all data as used for the paper 'Oligomodal metamaterials with multifunctional mechanics', as published in the Proceedings of the National Academy of Sciences. <strong>Abstract:</strong> Mechanical metamaterials are artificial composites that exhibit a wide range of advanced functionalities such as negative Poisson’s<br> ratio, shape-shifting, topological protection, multistability, extreme strength-to-density ratio and enhanced energy dissipation. In particular, flexible metamaterials often harness zero-energy deformation modes. To date, such flexible metamaterials have a single property, e.g. a single shape change, or are pluripotent, i.e. they can have many different responses, but typically require complex actuation protocols. Here, we introduce a novel class of oligomodal metamaterials that encode a few distinct properties that can be selectively controlled under uniaxial compression. To demonstrate this concept, we introduce a combinatorial design space containing various families of metamaterials. These families include monomodal—i.e. with a single zero-energy deformation mode, oligomodal—i.e. with a constant number of zero-energy deformation modes, and plurimodal—i.e. with many zero-energy deformation modes, whose number increases with system size. We then confirm the multifunctional nature of oligomodal metamaterials using both boundary textures and viscoelasticity. In particular, we realize a metamaterial that has a negative (positive) Poisson’s ratio for low (high) compression rate over a finite range of strains. The ability of our oligomodal metamaterials to host multiple mechanical responses within a single structure paves the way towards multi-functional materials and devices.本数据集包含发表于《美国国家科学院院刊》（Proceedings of the National Academy of Sciences）的论文《兼具多功能力学特性的寡模态超材料》（Oligomodal metamaterials with multifunctional mechanics）中所用的全部数据。**摘要：** 机械超材料（Mechanical metamaterials）是一类人工复合材料，可展现出丰富的先进功能，例如负泊松比（negative Poisson’s ratio）、形状变换、拓扑保护、多稳态、极致比强度以及增强型能量耗散。其中，柔性超材料通常依托零能变形模式（zero-energy deformation modes）实现相关特性。迄今为止，这类柔性超材料仅具备单一特性，例如单一的形状变换能力，或具备多能性，即可产生多种不同响应，但通常需要复杂的驱动协议。本文提出一类新型寡模态超材料（oligomodal metamaterials），其编码了若干可在单轴压缩下被选择性调控的独特力学特性。为验证该概念，本文构建了包含多类超材料的组合设计空间，这些类别分别为：单模态（monomodal）超材料——仅具备单一零能变形模式；寡模态超材料——具备固定数量的零能变形模式；以及多模态（plurimodal）超材料——具备大量随体系规模增长而增加的零能变形模式。随后，本文通过边界纹理与粘弹性两种方式验证了寡模态超材料的多功能特性。具体而言，本文实现了一款超材料，其在有限应变范围内，可在低（高）压缩速率下呈现负（正）泊松比。我们研发的寡模态超材料可在单一结构中实现多种力学响应，这为多功能材料与器件的开发铺平了道路。