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Double defects-induced elastic wave coupling and energy localization in a phononic crystal

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Authors

Jo, Soo-Ho; Shin, Yong Chang; Choi, Wonjae; Yoon, Heonjun; Youn, Byeng D; Kim, Miso

Issue Date
2021-09-16
Publisher
Springer Open
Citation
Nano Convergence. 2021 Sep 16;8(1):27
Keywords
Phononic crystalEnergy localizationDefect band splittingDouble defect modes
Abstract
This study aims to investigate elastic wave localization that leverages defect band splitting in a phononic crystal with double defects through in-depth analysis of comparison of numerical and experimental results. When more than one defect is created inside a phononic crystal, these defects can interact with each other, resulting in a distinctive physical phenomenon from a single defect case: defect band splitting. For a phononic crystal consisting of circular-hole type unit cells in a thin aluminum plate, under A0 (the lowest antisymmetric) Lamb waves, both numerical simulations and experiments successfully confirm the defect band splitting phenomenon via frequency response functions for the out-of-plane displacement calculated/measured at the double defects within a finite distance. Furthermore, experimental visualization of in-phase and out-of-phase defect mode shapes at each frequency of thesplit defect bands is achieved and found to be in excellent agreement with the simulated results. Different inter-distance combinations of thedouble defects reveal that the degree of the defect band splitting decreases with theincreasing distance due to weaker coupling between the defects. This work may shed light on engineering applications of a multiple-defect-introduced phononic crystal, including broadband energy harvesting, frequency detectors, and elastic wireless power transfer.
ISSN
2196-5404
Language
English
URI
https://doi.org/10.1186/s40580-021-00277-4

https://hdl.handle.net/10371/174994
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