NDLI: Experimental study of nonlinear acoustic bands and propagating breathers in ordered granular media embedded in matrix

Content Provider	Springer Nature Link
Author	Hasan, M. Arif Cho, Shinhu Remick, Kevin Vakakis, Alexander F. McFarland, D. Michael Kriven, Waltraud M.
Copyright Year	2014
Abstract	We experimentally study acoustic pass and stop-bands, and propagating breathers in harmonically excited, ordered granular chains composed of steel beads embedded in three different types of matrix—namely PDMS, polyurethane and geopolymer. Both single and coupled granular chains are tested and the bands and breathers are robustly detected in each case over varying frequency and amplitude ranges. Low-frequency acoustic pass-bands are characterized by pulse-like transmission in the granular media and negligible effective compression, whereas high-frequency stop-bands are characterized exhibit complete filtering of granular media dynamics and strong effective compression. At intermediate frequency ranges we observe the propagation of propagating breathers in the granular chains, in the form of wavetrains of localized wavepackets separated by silent regions. We study the effects of the matrix and the distance between coupled granular chains on the propagation of the breathers, and confirm the robustness of these highly nonlinear responses in this highly discontinuous class of acoustic metamaterials. Moreover, we relate our results to energy transfers between coupled granular chains. Finally, we propose a simplified theoretical model that fully recovers the experimentally detected responses. To the authors’ knowledge this is the first experimental report of acoustic filtering and experimental breathers in practical acoustic nonlinear metamaterials.
Starting Page	49
Ending Page	72
Page Count	24
File Format	PDF
ISSN	14345021
Journal	Granular Matter
Volume Number	17
Issue Number	1
e-ISSN	14347636
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-12-21
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Acoustic granular metamaterials Traveling breathers Acoustic stop and pass-bands Soft and Granular Matter, Complex Fluids and Microfluidics Engineering Fluid Dynamics Materials Science Geoengineering, Foundations, Hydraulics Industrial Chemistry/Chemical Engineering Engineering Thermodynamics, Heat and Mass Transfer
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Mechanics of Materials Materials Science

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