Band-gap Properties of Elastic Sandwich Metamaterial Plates with Composite Periodic Rod Core

A novel elastic sandwich metamaterial plate with composite periodic rod core is designed, and the frequency band-gap characteristics are numerically and experimentally investigated. The finite element and spectral element hybrid method (FE-SEHM) is developed to obtain the dynamic stiffness matrix of the sandwich metamaterial plate. The frequency response curves of the plate structure under the harmonic excitation are calculated using the presented numerical method and validated by the vibration experiment. By comparing with the frequency response curves of sandwich metamaterial plate with pure elastic rod core, improved band-gap properties are achieved from the designed metamaterial plate with composite periodic rod core. The elastic metamaterial plate with composite periodic rod core can generate more band-gaps, so it can suppress the vibration and elastic wave propagation in the structure more effectively.