Asymmetric transmission of elastic shear vertical waves in solids

Longhai Zeng; Jun Zhang; Yaolu Liu; Youxuan Zhao; Ning Hu

doi:10.1016/j.ultras.2019.03.016

Asymmetric transmission of elastic shear vertical waves in solids

Ultrasonics. 2019 Jul:96:34-39. doi: 10.1016/j.ultras.2019.03.016. Epub 2019 Mar 21.

Authors

Longhai Zeng¹, Jun Zhang², Yaolu Liu¹, Youxuan Zhao¹, Ning Hu³

Affiliations

¹ College of Aerospace Engineering, Chongqing University, Chongqing 400044, China.
² College of Aerospace Engineering, Chongqing University, Chongqing 400044, China; Chongqing Key Laboratory of Heterogeneous Material Mechanics, Chongqing University, Chongqing 400044, China. Electronic address: mejzhang@cqu.edu.cn.
³ College of Aerospace Engineering, Chongqing University, Chongqing 400044, China. Electronic address: ninghu@cqu.edu.cn.

PMID: 30947072
DOI: 10.1016/j.ultras.2019.03.016

Abstract

In this work, we propose an asymmetric transmission structure (ATS) for elastic shear vertical (SV) waves in solids, which has been relatively unexplored. The ATS is constituted by a metasurface and a phononic crystal (PC) possessing a directional band gap. While the metasurface aims to redirect the incident wave, the PC acts as a directional filter. The metasurface is composed of a stacked array of composite plates with two connecting parts made of different materials. To examine the performance of the designed ATS, full numerical simulations have been conducted. The numerical results indicate that the proposed ATS offered a relatively broad working frequency band and had a one order of magnitude difference in terms of transmission between the positive and negative incidences. Our study provides an alternative method to control elastic SV waves and could benefit applications in various fields, such as Micro-Electro-Mechanical System (MEMS), in which thin plates are frequently used components.