Elastic wave propagation in layered anisotropic media (original) (raw)

On The Wave Propagation In Layered Plates Of General Anisotropic Media

2008

Analysis for the propagation of elastic waves in arbitrary anisotropic plates is investigated, commencing with a formal analysis of waves in a layered plate of an arbitrary anisotropic media, the dispersion relations of elastic waves are obtained by invoking continuity at the interface and boundary of conditions on the surfaces of layered plate. The obtained solutions can be used for material systems of higher symmetry such as monoclinic, orthotropic, transversely isotropic, cubic, and isotropic as it is contained implicitly in the analysis. The cases of free layered plate and layered half space are considered separately. Some special cases have also been deduced and discussed. Finally numerical solution of the frequency equations for an aluminum epoxy is carried out, and the dispersion curves for the few lower modes are presented. The results obtained theoretically have been verified numerically and illustrated graphically.

WAVE PROPAGATION IN BOUNDED ELASTIC MEDIUM

isara solutions, 2011

Seismic anisotropy is widespread in many types of rocks at many depths in many geo- logical and tectonic environments. Lithological and crystal alignments, pre-stresses, aligned cracks, periodic thin layering and fluid-filled pores are identified as major causes of seis- mic anisotropy in the Earth. In the presence of aligned cracks, an elastic medium behaves anisotropic to wave propagation. Even the absence of point symmetry in pore distribution results in the anisotropy of general type with arbitrary symmetry.