Simultaneous manipulation of elastic and acoustic waves in acousto-elastic metamaterial beams

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

Extreme Mechanics Letters Pub Date : 2025-01-03 DOI:10.1016/j.eml.2024.102286

Chang Fu , Xiao-Lei Tang , Yi-Da Liu , Tian-Xue Ma , Yue-Sheng Wang

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Abstract

In this paper, one-dimensional (1D) acousto-elastic metamaterial (AEMM) beams are proposed for simultaneous control of elastic and acoustic waves. The AEMM beam is formed by attaching hollow cylinders periodically on the surface of an elastic beam. In the elastic case, the characteristics of flexural waves are analyzed. On the other hand, the AEMM beam supports the guidance of surface acoustic waves. The band structures as well as the frequency responses of the AEMM beam are numerically calculated by employing the finite element approach. For either elastic flexural waves or surface acoustic waves, the band-gaps can be effectively modified by varying the geometry of the hollow cylinders. Furthermore, according to the concept of mode gap, the AEMM beam with a point defect is designed by changing the geometric configuration for dual wave confinement. For the experimental verification, the perfect and defected AEMM beams are fabricated through 3D-printing. The existence of passbands and band-gaps for elastic and acoustic waves is demonstrated numerically and experimentally. Moreover, simultaneous localization of elastic and acoustic waves within the defected AEMM beam is observed.

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声弹性超材料梁中弹性和声波的同时操纵

本文提出了一维声弹性超材料（AEMM）梁，用于同时控制弹性和声波。AEMM梁是通过在弹性梁表面周期性地附加空心圆柱体而形成的。在弹性情况下，分析了弯曲波的特性。另一方面，AEMM波束支持表面声波的引导。采用有限元方法对AEMM梁的频带结构和频率响应进行了数值计算。无论是弹性弯曲波还是表面声波，都可以通过改变空心圆柱体的几何形状来有效地改变带隙。此外，根据模隙的概念，通过改变双波约束的几何结构，设计了带点缺陷的AEMM光束。为了进行实验验证，采用3d打印技术制备了完美和有缺陷的AEMM光束。通过数值和实验证明了弹性波和声波存在通带和带隙。此外，在缺陷的AEMM波束中，还观察到弹性波和声波同时局部化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.