Metadamping and energy dissipation enhancement via hybrid phononic resonators

A novel metamaterial configuration is presented that combines hybrid attributes from acoustic metamaterials and phononic crystals. The dispersion characteristics of the system, referred to as the phononic resonator (PR), is shown to vary across a wide spectrum of behaviors that can, via optimal selection of inertial and stiffness parameters, be tuned to resemble a locally resonant mechanism, a phononic system, as well as a uniform homogeneous lattice. When coupled with damping elements, the emergent dissipative effect, known as the metadamping phenomenon, of the PR is shown to exceed that of a statically equivalent acoustic metamaterial under certain conditions which are highlighted here. The metadamping amplification is verified in finite PR systems via a power flow approach that depicts the spatial rate of energy dissipation along the length of a 100 cells phononic resonator. (C) 2017 Elsevier Ltd. All rights reserved.