Shear horizontal wave propagation in periodically layeredcomposites

摘要

The transverse resonance approach to guided wave analysis isnapplied to shear horizontal (SH) wave propagation in periodicallynlayered composites. It is found for SH waves that at high values of thenguided wavevector Β, the wave energy is trapped in the slower ofnthe two media and propagates accordingly at the slower wavespeed. At lownvalues of Β, however, the modes demonstrate a clustering behavior,nindicative of the underlying Floquet wave structure. The number of modesnin a cluster is observed to correlate with the number of unit cells innthe layered plate. New physical insights into the behavior of thesensystems are obtained by analyzing the partial waves of the guided SHnmodes in terms of Floquet waves. We show that the fast and slow shearnwaves in the periodically layered composite play an analogous role tonthe longitudinal and shear partial waves comprising Lamb waves in anhomogeneous plate