The effect of electro-momentum coupling on unidirectional zero reflection in layered generalized Willis Metamaterials

IF 4.3 3区工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Extreme Mechanics Letters Pub Date : 2025-03-27 DOI:10.1016/j.eml.2025.102318

Hai D. Huynh , S.S. Nanthakumar , Harold S. Park , Timon Rabczuk , Xiaoying Zhuang

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Abstract

Piezoelectric materials with asymmetric microstructures have emerged in elastodynamics as generalized Willis media to create an additional cross-coupling, termed electro-momentum coupling, which offers a new degree of freedom to manipulate mechanical waves. In this study, we present numerical simulations of the scattering of longitudinal waves in layered piezoelectric Willis metamaterials. Based on the asymmetry of reflection amplitudes due to the electro-momentum coupling, a topology optimization approach is employed to design a one-way zero reflection system with the introduction of material loss to control the asymmetric reflection amplitudes and embrace non-Hermitian physics. We conduct two topology optimization studies to design unit cells connected either with or without external electric control. The modeling of wave propagation shows the effects of both classical Willis coupling and electro-momentum coupling for each wave propagation study.

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电动量耦合对层状广义Willis超材料中单向零反射的影响

具有非对称微结构的压电材料作为广义威利斯介质出现在弹性动力学中，产生了额外的交叉耦合，称为电动量耦合，这为操纵机械波提供了新的自由度。在这项研究中，我们提出了纵波在层状压电Willis超材料中的散射的数值模拟。基于电动量耦合导致的反射振幅的不对称性，采用拓扑优化方法设计了一种引入材料损耗的单向零反射系统，以控制反射振幅的不对称性，并采用非厄米物理。我们进行了两项拓扑优化研究，以设计有或没有外部电气控制的单元电池。波的传播模型显示了经典威利斯耦合和电动量耦合对每一波传播研究的影响。

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来源期刊

Extreme Mechanics Letters Engineering-Mechanics of Materials

CiteScore

9.20

自引率

4.30%

发文量

179

审稿时长

45 days

期刊介绍： Extreme Mechanics Letters (EML) enables rapid communication of research that highlights the role of mechanics in multi-disciplinary areas across materials science, physics, chemistry, biology, medicine and engineering. Emphasis is on the impact, depth and originality of new concepts, methods and observations at the forefront of applied sciences.