期刊
SMART MATERIALS AND STRUCTURES
卷 26, 期 4, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-665X/aa6387
关键词
dielectric elastomer; tunable phononic crystal; wave propagation; nonlinear elasticity; snap-through instability; acoustics; sonic band gap
资金
- Israel Science Foundation
- Technion fellowship by Lady Davis Foundation
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.
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