16 March 2018 Locally resonant metamaterials with shape-memory alloy springs
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Locally resonant metamaterials offer bandgap formation for wavelengths much longer than the lattice size, en- abling low-frequency and wideband vibration attenuation. Acoustic/elastic metamaterials made from resonating components usually do not exhibit reconfigurable and adaptive characteristics since the bandgap frequency range (i.e. target frequency and bandwidth combination) is fixed for a given mass ratio and stiffness of the resonators. In this work, we explore locally resonant metamaterials that exploit shape-memory alloy springs in an effort to develop adaptive metamaterials that can exhibit tunable bandgap properties. An analytical model for locally res- onant metastructures (i.e. metamaterials with specific boundary conditions) is combined with a shape-memory spring model of the resonator springs to investigate and exploit the potential of temperature-induced phase transformations and stress-induced hysteretic behavior of the springs. Various case studies are presented for this new class of smart metamaterials and metastructures.
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Vagner Candido de Sousa, Vagner Candido de Sousa, Christopher Sugino, Christopher Sugino, Carlos De Marqui, Carlos De Marqui, Alper Erturk, Alper Erturk, "Locally resonant metamaterials with shape-memory alloy springs", Proc. SPIE 10595, Active and Passive Smart Structures and Integrated Systems XII, 1059517 (16 March 2018); doi: 10.1117/12.2302773; https://doi.org/10.1117/12.2302773

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