Abstract Spatio-temporally modulated composite metamaterials (STMCMs) possess tunable and nearly “full-banded” asymmetrical elastic wave properties, making them highly promising for uses in a wide range of applications, such as cloaking, acoustic information processing, ideal vibration isolation, ultrasonic technology. Despite much progress made in the structural design and fabrication of intelligent materials, the realization of STMCMs for practical fabrication is still an open issue because of a series of challenges existing in the rational design of the spatial and temporal ordered structures. In this work, we propose an implementation scheme for a laminated STMCM and computationally predict its performance. The elementary structure of the laminated STMCM is constructed by a functional component named as “acoustic switch” that endows the material with spatio-temporally modulated mesostructural topology and properties. This work not only provides a practical implementation scheme for experimental realization of the STMCMs, but also improves the understanding of STMCMs.

中文翻译：

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使用可切换细观结构拓扑的时空调制复合超材料

摘要 时空调制复合超材料 (STMCM) 具有可调谐且近乎“全带”的非对称弹性波特性，使其在广泛的应用中极具前景，例如隐形、声学信息处理、理想的隔振、超声波技术。尽管在智能材料的结构设计和制造方面取得了很大进展，但由于在空间和时间有序结构的合理设计中存在一系列挑战，STMCMs 的实际制造仍然是一个悬而未决的问题。在这项工作中，我们提出了一种叠层 STMCM 的实现方案，并通过计算预测其性能。层压 STMCM 的基本结构由一个名为“声学开关”的功能组件构成，该组件赋予材料时空调制的细观结构拓扑和特性。这项工作不仅为STMCMs的实验实现提供了实际的实现方案，而且提高了对STMCMs的理解。