We realize soft topological mechanical metamaterials with pronounced polar elastic responses (i.e. softer on one edge than the other) both in the quasi-static 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 the 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 affirm the persistence of the response in lossy media.

中文翻译：

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在机械和动态行为中具有显着极性弹性的软拓扑超材料

我们实现了在准静态和动态状态下具有明显极性弹性响应（即，一个边比另一个边软）的软拓扑机械超材料。数值模拟和实验结果证实，尽管使用有损弹性体作为整体介质，但在低应变率和高应变率下超材料响应中仍存在方向依赖性。超材料表现出通过加载取向和晶格结构的几何变化来调整拓扑受保护的单轴机械刚度的位置的方法。高速视频记录显示，受到冲击的软超材料具有强大的拓扑保护的不对称波传播。