In this work, we establish a link between recent investigations on bending-to-shear conversion phenomena in sandwich structures, and the existence of a local group velocity plateau in the near-cut-on bandwidth of high-order guided resonances. The resulting non-dispersiveness allows the actuation and propagation of these elastic waves over a long range, which is unusual for such structures in the low acoustic bandwidth. The experimental set-up involves an array of piezoelectric patches, designed to produce a custom wave shape displacement field as predicted by Floquet-Bloch theory.
展开▼
