Scattering characteristics of the chiral slab for normally incident longitudinal elastic waves
Journal
Wave Motion
Journal Volume
30
Journal Issue
2
Pages
135-142
Date Issued
1999
Author(s)
Abstract
Acoustically active materials (chiral materials) that lack centrosymmetry due to chirality in their microstructures can be characterized by the constitutive relations and governing equations for noncentrosymmetric, isotropic micropolar materials. Accordingly, two longitudinally, two right circularly and two left circularly polarized transversal elastic waves can propagate in chiral medium. Using appropriate field representations along with prescribed boundary conditions, scattering characteristics at chiral interfaces can be realized. In this paper, reflection and transmission characteristics of chiral slabs bounded by achiral media for longitudinally elastic waves with normal incidence are thoroughly discussed. Through the above investigations we are in a position to design the chiral slab by tailoring the material parameters and determine the number and the locations of approximately vanishing reflection of the chiral slab over frequency ranges of interest. Results obtained can be applied for the design of broadband acoustic impedance transformer and acoustic absorbers. © 1999 Elsevier Science B.V.
SDGs
Type
journal article