Scanning acoustic microscopy (SAM) is a high-resolution nondestructive method useful for nearsurface material elastic property quantification as well as crack size determination for surface and subsurface cracks. Scanning acoustic microscopy was developed by Quate et a1. [1, 2] and has been extensively studied by a number of researchers [3-11]. The most important contrast phenomenon in SAM is t...

Adding tiny amounts of long polymer chains to a fluid dramatically alters its behavior. In this work, we show that channel flows such viscoelastic fluids at vanishingly small Reynolds numbers are highly sensitive weak disturbances, even though they linearly stable. We thus experimentally disturbance elicits strong fluctuations with continuous spectrum in three different regimes and elastic wave...

Dispersion of Love waves is studied in a self-reinforced layer lying over an elastic non-homogeneous half space. The wave velocity equation is found to be in perfect agreement with the corresponding classical result when the anisotropic elastic parameters tend to zero. Dispersion curves for the shear wave velocity ratio and the effect of anisotropy and heterogeneity have been shown graphically....

A recent measurement of the differential cross sections for elastic K+p and K-p scattering is discussed within the framework of a dual absorptive model which was proposed earlier. The non-Pomeron part of the elastic scattering amplitude is shown to be strongly dominated by the most peripheral partial waves within the interaction radius, namely by the B N gr partial waves. (Submitted to Physics ...

Both theoretical investigations and successful experimental research were performed recently, confirming the existence and demonstrating the main properties of bulk strain solitary waves in nonlinearly elastic solid wave guides. Our current research is devoted to non-linear wave processes in layered elastic wave guides with inhomogeneities modelling damage/delamination. Here, we present first e...

Elastic anisotropy is present where the speed of a seismic wave depends on its direction. In Earth's mantle, elastic anisotropy is induced by minerals that are preferentially oriented in a directional flow or deformation. Earthquakes generate two seismic wave types: compressional (P) and shear (S) waves, whose coupling in anisotropic rocks leads to scattering, birefringence, and waves with hybr...

In this chapter, we study the solutions, both analytical and numerical, to the two most important equations of one-dimensional continuum dynamics. The heat equation models the diffusion of thermal energy in a body; here, we analyze the case of a one-dimensional bar. The wave equation describes vibrations and waves in continuous media, including sound waves, water waves, elastic waves, electroma...

The scattering of elastic waves in heterogeneous media is discussed. Explicit expressions are derived for the attenuation of longitudinal and transverse elastic waves in terms of the statistics of the density and Lamé parameter fluctuations. The derivation is based upon diagrammatic methods with the problem posed in terms of the Dyson equation. The Dyson equation is solved for the mean field re...

The scattering of elastic waves in a medium with damage from microcracking is discussed. The influence of damage from penny-shaped microcracks within a homogeneous medium is considered. The microcracks are assumed to be randomly oriented and uniformly distributed. Explicit expressions are derived for the attenuation of longitudinal and shear elastic waves in terms of the damage parameter and th...