The adhesive contact of viscoelastic spheres

International audienceWe have formulated the restricted self-consistent model for the adhesive contact of linear viscoelastic spheres. This model is a generalization of both the Ting (J. Appl. Mech. 33 (1966) 845) approach to the viscoelastic contact of adhesionless spheres and the restricted self-consistent model for adhesive axisymmetric bodies. We also show how the model can be used in practice by giving a few examples of numerical solutions

A time-domain method to solve transient elastic wave propagation in a multilayer medium with a hybrid spectral-finite element space approximation

International audienceThis paper introduces a new numerical hybrid method to simulate transient wave propagation in a multilayer semi-infinite medium, which can be fluid or solid, subjected to given transient loads. The medium is constituted of a finite number of unbounded layers with finite thicknesses. The method has a low numerical cost and is relatively straightforward to implement, as opposed to most available numerical techniques devoted to similar problems. The proposed method is based on a time-domain formulation associated with a 2D-space Fourier transform for the variables associated with the two infinite dimensions and uses a finite element approximation in the direction perpendicular to the layers. An illustration of the method is given for an elasto-acoustic wave propagation problem: a three-layer medium constituted of an elastic layer sandwiched between two acoustic fluid layers and excited by an acoustic line source located in one fluid layer

Dispersion de vitesse dans l'os trabéculaire : influence de la diffusion indépendante et de l'absorption visqueuse

National audienc

"Approximate model for the adhesive contact of viscoelastic sphere"

International audienc

"Computer simulations of ultrasonic propagation in trabecular bone"

International audienc

Accounting for multiple scattering allows a better prediction of velocity dispersion in trabecular bone than an independent scattering model.

International audienc

Prediction of 'anomalous' velocity dispersion with an independent scattering model in trabecular bone : comparison with a multiple scattering model

International audienc

Dependence of ultrasonic attenuation to bone mass and microstructure in bovine cortical bone

International audienc

Using acoustical modeling and numerical simulation for bone quantitative ultrasound.

International audienc

"A method for the positioning of cracks detected by ultrasound through an austenitic cladding"

International audienc