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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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.