Ultrasonic Wave Propagation in Non Homogeneous Media

Abstract

The WKB method applied to the reflectiontransmission by a depth-varying random distribution of cylinders in a fluid slab-like region.- Advances in ultrasonic testing of austenitic stainless steel welds. Towards a 3D description of the material including attenuation and optimisation by inversion.- Imaging of defects within austenitic steel welds using an ultrasonic array.- Materials and mechanical aspects of bonded joints.- The causal differential scattering approach to calculating the effective properties of random composite materials with a particle size distribution.- Modelling of scattering of ultrasounds by flaws for NDT.- Finite element computation of leaky modes in stratified waveguides.- Ultrasonic bulk wave propagation in concentrated heterogeneous slurries..- Dynamics of elastic bodies connected by a thin adhesive layer.- Acoustic wave attenuation in a rough-walled waveguide filled with a dissipative fluid.- Some advances towards a better understanding of wave propagation in civil engineering multiwires trands.- A numerical method for the simulation of NDT experiments in an elastic waveguide.- Finite elements for a beam system with nonlinear contact under periodic excitation.- Nonlinear acoustic fast and slow dynamics of damaged composite materials: correlation with acoustic emission.- Asymptotic expansions of vibrations with small unilateral contact.- Propagation of compressional elastic waves through a 1-D medium with contact nonlinearities.- 3D Finite Element simulations of an air-coupled ultrasonic NDT system.- The reverse time migration technique coupled with finite element methods.- Modelling of corner echo ultrasonic inspection with bulk and creeping waves.- Attenuation of Lamb waves in the vicinity of a forbidden band in a phononic crystal.- 3D orthogonality relations for the surface waves and the far field evaluation in viscoelastic layered solids with or without fluid loading.- Damage detection in foam core sandwich structures using guided waves.- Sensitivity of the guided waves to the adhesion of lap joints: Finite Element modeling and experimental investigations.- Guided waves in empty and filled pipes with optimized magnetostrictive transduction.- Piezoelectric material characterization by acoustic methods.- Ultrasound characterization of aggregated red blood cells: towards in vivo application.- A 3D semi-analytical model to predict the behavior of ultrasonic bounded beam traveling in cylindrical solid bar embedded in a solid matrix..- Comparison between a multiple scattering method and direct numerical simulations for elastic wave propagation in concrete.- Investigation of a novel polymer foam material for air coupled ultrasonic transducer applications.- Dual signal processing approach for Lamb wave analysis.- Structural health monitoring of bonded composite patches using Lamb waves.- Simulation of structural noise and attenuation occurring in ultrasonic NDT of polycrystalline materials.- Ultrasonic array reconstruction methods for the localization and the characterization of defects in complex NDT configurations.- Investigation of damage mechanisms of composite materials: Multivariable analysis based on temporal and wavelet features extracted from acoustic emission signals.- Investigation of damage mechanisms of composite materials: Multivariable analysis based on temporal and wavelet features extracted from acoustic emission signals.- Propagation of elastic waves in a fluid-loaded anisotropic functionally graded waveguide: Application to ultrasound characterization of cortical bone.- Coherent wave propagation in solids containing spatially varying distributions of finite-size cracks.