Ultrasonic Wave Propagation in Non Homogeneous Media (eBook)

Preface 6
Contents 8
The WKB method applied to the reflection transmission by a depth varying random distribution of cylinders in a fluid slab like region 12
Advances in ultrasonic testing of autenitic stainless steel welds. Towards a 3-d description af the material including attenuation and optimisation by inversion 25
Imaging of defects within austenitic steel welds using an ultrasonic array 35
Materials and mechanical aspects of bonded joints 49
The causal differential scattering approach tocal culating the effective properties of random composite materials with a particle size distribution 58
Modeling of scattering of ultrasounds by flaws for NDT 69
Finite element computation of leaky modes in stratified waveguides 80
Ultrasonic bulk wave propagation in concentrated heterogeneous slurries. 94
Dynamics of elastic bodies connected by a thin adhesive layer 106
Acoustic wave attenuation in a rough-walled waveguide filled with a dissipative fluid 118
Some advances towards a better understanding of wave propagation in civil engineering multi-wire strands 130
A numerical method for the simulation of NDT experiments in an elastic waveguide 143
Finite elements for a beam system with nonlinear contact under periodic excitation 154
Nonlinear acoustic fast and slow dynamics of damaged composite materials : correlation with acoustic emission 165
Asymptotic expansions of vibrationswith small unilateral contact 176
Propagation of compressional elastic waves through a 1-D medium with contact nonlinearities 186
3D Finite Element simulations of an air-coupled ultrasonic NDT system 198
The reverse time migration technique coupled with finite element methods 210
Modelling of corner echo ultrasonic inspection with bulk and creeping waves 220
Attenuation of Lamb waves in the vicinity of a forbidden band in a phononic crystal 230
3D orthogonality relations for the surface waves and the far field evaluation in viscoelas tic layered solids with or without fluid loading 239
Damage detection in foam core sandwich structures using guided waves 252
Sensitivity of the guided waves to the adhesion of lap joints: Finite Element modeling and experimental investigations 262
Guided waves in empty and filled pipes with optimized magnetostrictive transduction 272
Piezoelectric material characterization by acoustic methods 283
Ultrasound characterization of aggregated red blood cells: towards in vivo application 293
A 3-d semi-analytical model to predict the behavior of ultrasonic bounded beam traveling in cylindrical solid bar embedded in a solid matrix 303
Comparison between a multiple scattering method and direct numerical simulations for elastic wave propagation in concrete 316
Investigation of a novel polymer foam material for air coupled ultrasonic transducer applications 327
Dual signal processing approach for Lamb wave analysis 339
Structural health monitoring of bonded composite patches using Lamb waves 352
Simulation of structural noise and attenuation occuring in ultrasonic NDT of polycrystalline materials 361
Ultrasonic array reconstruction methods for the localization and the characterization of defects in complex NDT configurations 372
Ultrasonic nonlinear parameter measurement: critical investigation of the instrumentation 381
Investigation of damage mechanisms of composite materials: Multivariable analysis based on temporal and wavelet features extracted from acoustic emission signals 392
Propagation of elastic waves in a fluid-loaded anisotropic functionally graded waveguide: Application to ultrasound characterization of cortical bone 403
Coherent wave propagation in solids containing spatially varying distributions of finite-size cracks 415