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Perfect acoustic bandgap metabeam based on a quadruple-mode resonator array

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Title: Perfect acoustic bandgap metabeam based on a quadruple-mode resonator array
Authors: Fujita, Kentaro Browse this author
Tomoda, Motonobu Browse this author →KAKEN DB
Wright, Oliver B. Browse this author →KAKEN DB
Matsuda, Osamu Browse this author →KAKEN DB
Issue Date: 19-Aug-2019
Publisher: American Institute of Physics (AIP)
Journal Title: Applied physics letters
Volume: 115
Issue: 8
Start Page: 081905
Publisher DOI: 10.1063/1.5117283
Abstract: Solid structures guide a multitude of elastic modes of different polarizations including both compression and shear, and the nature of the elastic constant tensor implies a much richer behavior than in optics. Here, we introduce a metamaterial in the form of a rectangular cross section beam of a single isotropic material that can simultaneously suppress all elastic-wave polarizations in the beam over a range of frequencies in the kHz range. This is experimentally achieved by machining replicas of a subwavelength unit cell in an aluminum metabeam based on a planar resonator with interconnected ribs, showing complex vibrational degrees of freedom that allow it to couple to compressional, in-plane shear, flexural and torsional vibrations, that is, all four existing mode types. The result is a lightweight structure that can forbid all possible acoustic modes over the metamaterial bandgap frequency range, an exotic behavior that opens up diverse applications in easily manufacturable vibration isolation structures and acoustic wave control.
Rights: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Appl. Phys. Lett. 115, 081905 (2019) and may be found at
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 友田 基信

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