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23 March 2015 A wrinkly phononic crystal slab
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The buckling induced surface instability is employed to propose a tunable phononic crystal slab composed of a stiff thin film bonded on a soft elastomer. Wrinkles formation is used to generate one-dimensional periodic scatterers at the surface of a finitely thick slab. Wrinkles’ pattern change and corresponding stress is employed to control wave propagation triggered by a compressive strain. Simulation results show that the periodic wrinkly structure can be used as a transformative phononic crystal which can switch band diagram of the structure in a reversible behavior. Results of this study provide opportunities for the smart design of tunable switch and elastic wave filters at ultrasonic and hypersonic frequency ranges.
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Alireza Bayat and Faramarz Gordaninejad "A wrinkly phononic crystal slab", Proc. SPIE 9438, Health Monitoring of Structural and Biological Systems 2015, 943810 (23 March 2015);

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