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18 April 2016 A thermally tunable phononic crystal
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A thermally tunable periodic structure is proposed and studied through analytical and finite element methods to investigate the effect of thermomechanical coupling in dynamic regime. Bimaterial ligaments composed of two strips with contrast in their thermal expansion coefficients are employed to design local resonators inside a periodic structure. The thermally induced large deformations are utilized to exploit pattern change in the structure to control elastic wave propagation. Geometric and material nonlinearities are taken into account to study the dynamic response of the deformed structure. Once the temperature gradient is removed the structure tends to return to the initial state providing opportunities to be used as thermally tunable acoustic switches and filters.
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Alireza Bayat and Faramarz Gordaninejad "A thermally tunable phononic crystal", Proc. SPIE 9800, Behavior and Mechanics of Multifunctional Materials and Composites 2016, 98000W (18 April 2016);

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