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Advances in Mechanical Metamaterials

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Front. Mater. | doi: 10.3389/fmats.2018.00008

Experimental observation of a large low-frequency band gap in a polymer waveguide

 Marco Miniaci1*, Matteo Mazzotti2, Maciej Radzienski3, Nesrine Kherraz1, Pawel Kudela3, Wieslaw Ostachowicz3,  Bruno Morvan1,  Federico Bosia4* and  Nicola M. Pugno5
  • 1University of Le Havre, France
  • 2Drexel University, United States
  • 3Polish Academy of Sciences, Poland
  • 4Università degli Studi di Torino, Italy
  • 5University of Trento, Italy

The quest for large and low frequency band gaps is one of the principal objectives pursued in a number of engineering applications, ranging from noise absorption to vibration control, to seismic wave abatement. For this purpose, a plethora of complex architectures (including multi-phase materials) and multi-physics approaches have been proposed in the past, often involving difficulties in their practical realization.
To address this issue, in this work we propose an easy-to-manufacture design able to open large, low frequency complete Lamb band gaps exploiting a suitable arrangement of masses and stiffnesses produced by cavities in a monolithic material. The performance of the designed structure is evaluated by numerical simulations and confirmed by Scanning Laser Doppler Vibrometer (SLDV) measurements on an isotropic polyvinyl chloride plate in which a square ring region of cross-like cavities is fabricated. The full wave field reconstruction clearly confirms the ability of even a limited number of unit cell rows of the proposed design to efficiently attenuate Lamb waves. In addition, numerical simulations show that the structure allows to shift of the central frequency of the BG through geometrical modifications. The design may be of interest for applications in which large BGs at low frequencies are required.

Keywords: Phononic crystals, band gap, Guided waves, Scanning Laser Doppler, Finite Element Modeling

Received: 27 Oct 2017; Accepted: 29 Jan 2018.

Edited by:

Alberto Corigliano, Politecnico di Milano, Italy

Reviewed by:

Marco Paggi, IMT School for Advanced Studies Lucca, Italy
Fernando Fraternali, Università degli Studi di Salerno, Italy  

Copyright: © 2018 Miniaci, Mazzotti, Radzienski, Kherraz, Kudela, Ostachowicz, Morvan, Bosia and Pugno. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence:
Dr. Marco Miniaci, University of Le Havre, Le Havre, France,
Dr. Federico Bosia, Università degli Studi di Torino, Turin, Italy,