Tunable magneto-granular phononic crystals

This paper reports on the study of the dynamics of 1D magneto-granular phononic crystals composed of a chain of spherical steel beads inside a properly designed magnetic field. This field is induced by an array of permanent magnets, located in a holder at a given distance from the chain. The theoret...

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Bibliographic Details
Published in:Applied physics letters 2016-04, Vol.108 (16)
Main Authors: Allein, F., Tournat, V., Gusev, V. E., Theocharis, G.
Format: Article
Language:English
Subjects:
Acoustics
Applied physics
Beads
Chains
Contact potentials
Crystals
Dynamic response
Elastic waves
Engineering Sciences
Magnetic fields
Magnetism
Metamaterials
Nonlinear systems
Permanent magnets
Propagation modes
Translations
Wave propagation
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Summary:This paper reports on the study of the dynamics of 1D magneto-granular phononic crystals composed of a chain of spherical steel beads inside a properly designed magnetic field. This field is induced by an array of permanent magnets, located in a holder at a given distance from the chain. The theoretical and experimental results of the band gap structure are displayed, including all six degrees of freedom for the beads, i.e., three translations and three rotations. Experimental evidence of transverse-rotational modes of propagation is presented; moreover, by changing the strength of the magnetic field, the dynamic response of the granular chain is tuned. The combination of non-contact tunability with the potentially strong nonlinear behavior of granular systems ensures the suitability of magneto-granular phononic crystals as nonlinear, tunable mechanical metamaterials for use in controlling elastic wave propagation.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4947192