Soft Topological Metamaterials with Pronounced Polar Elasticity in Mechanical and Dynamic Behaviors
Soft Topological Metamaterials with Pronounced Polar Elasticity in Mechanical and Dynamic Behaviors
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DOI：
10.1103/physrevapplied.14.044034
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发表时间：
2020-10
影响因子：
4.6
通讯作者：
Maya Pishvar;R. Harne
中科院分区：
文献类型：
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作者：
Maya Pishvar;R. Harne
我们实现了具有显著极性弹性响应的软拓扑机械超材料（即，一边比另一边更软）。数值模拟和实验结果证实了在低应变率和高应变率下超材料响应的方向依赖性的存在，尽管使用有损耗弹性体作为体介质。超材料展示的手段来定制的位置的拓扑保护的单轴机械刚度的加载方向和几何形状的变化，以晶格结构的优点。高速视频记录显示了强大的拓扑保护的非对称波传播的软超材料受到冲击。结果表明，一类超材料结构具有极性弹性行为，并确认在有损介质中的持续性的响应。
We realize soft topological mechanical metamaterials with pronounced polar elastic responses (i.e., softer on one edge than the other) in both the quasistatic and dynamic regimes. Numerical simulations and experimental results confirm the presence of directional dependence in metamaterial response at low and high strain rates, despite the use of lossy elastomer as bulk media. The metamaterials exhibit means to tailor the location of topologically protected uniaxial mechanical stiffnesses by virtue of both loading orientation and geometric changes to the lattice architecture. High-speed video recordings show strong topologically protected asymmetric wave propagation for the soft metamaterials subjected to impact. The results indicate a class of metamaterial architectures possessing polar elastic behavior and confirm the persistence of the response in lossy media.