Tuning sound with soft dielectrics

Bortot, Eliana and Shmuel, Gal (2017) Tuning sound with soft dielectrics. Smart Materials and Structures, 26 (4). 045028. ISSN 0964-1726

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Abstract

Soft dielectric tubes undergo large deformations when subjected to radial voltage. Using the theory of nonlinear electroelasticity, we investigate how voltage-controlled deformations of these tubes in an array alter acoustic wave propagation through it. We show that the propagation is annihilated across a certain audible frequency range, referred to as a sonic band gap. We carry out a numerical study, to find that the band gap depends nonlinearly on the voltage, owing to geometrical and material nonlinearities. By analyzing different mechanical constraints, we demonstrate that snap-through instabilities resulting from these nonlinearities can be harnessed to achieve sharp transitions in the gap width. Our conclusions hint at a new strategy to adaptively filter sound using a simple control parameter - an applied voltage.

Item Type:	Article
Uncontrolled Keywords:	dielectric elastomer, tunable phononic crystal, wave propagation, nonlinear elasticity, snap-through instability, acoustics, sonic band gap
Subjects:	H600 Electronic and Electrical Engineering J500 Materials Technology not otherwise specified
Department:	Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User:	Paul Burns
Date Deposited:	04 Apr 2019 13:41
Last Modified:	10 Oct 2019 16:31
URI:	http://nrl.northumbria.ac.uk/id/eprint/38755

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