Switchable Locally Resonant Metamaterials
Pai Wang (Harvard University), Filippo Casadei (Harvard university), Katia Bertoldi (Harvard University)
Mechanics and Dynamics of Periodic Structures
Wed 10:45 - 12:15
Salomon 101
We present a new class of switchable acoustic metamaterials based on local resonators. Micro-structures with easy-to-buckle components are proposed for the geometric design configurations. Local buckling and large deformation of the metamaterial are intentionally exploited as a novel and very simple approach to switch and tune the band gaps of propagating elastic waves. The nonlinear effects of both geometry and material behavior during the deformation are investigated. The dispersion relations of the deformed metamaterials are calculated using frequency domain numerical simulations on the unit cell of spatial periodicity. The characteristics of an instability-induced phononic switch are demonstrated. This study provides insights into the design parameters and engineering guidelines for various potential applications, including filters for vibration and noise reduction devices, tunable waveguides, and acoustic imaging equipment.