Skip to Main content Skip to Navigation
Theses

Étude des propriétés mécaniques et acoustiques d'un milieu granulaire sous chargements cycliques

Abstract : This work deals with the characterization, by an acoustical method, of the mechanical behaviour of a dry dense granular medium under cyclic loading using an acoustic technique. The sound propagation through the contact-force network supporting the external load offers a non-invasive probe of the viscoelastic properties of such heterogeneous media. First, we study the visco-elasto-plastic response of the glass bead packing during an oedometric test and investigate the settlement or residual deformation and the hysteretic dissipation as function of loading cycles, strain rate and the surface state of the grains. We show that the modulus deduced from mechanical results (strain e ~ 10?4-10?³)) are about tens time smaller than those from acoustic measurements (e ~ 10?7) due to the nonlinear response of the material. Next, we examine creep and relaxation phenomena of the granular medium. The novelty of our study lies in the simultaneous monitoring of the sample using acoustic measurements. We find quasi-logarithmic increase of sound velocities in both mechanical tests. The model based on the mechanics of micro-contact between rough grains describes fairly well our experimental results
Complete list of metadatas

Cited literature [134 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00350277
Contributor : Abes Star :  Contact
Submitted on : Thursday, April 1, 2010 - 11:36:28 AM
Last modification on : Wednesday, February 26, 2020 - 7:06:03 PM
Long-term archiving on: : Thursday, September 23, 2010 - 12:34:18 PM

File

2008PEST0248_0_0.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-00350277, version 2

Collections

Citation

Amandine Miksic. Étude des propriétés mécaniques et acoustiques d'un milieu granulaire sous chargements cycliques. Autre [cond-mat.other]. Université Paris-Est, 2008. Français. ⟨NNT : 2008PEST0248⟩. ⟨tel-00350277v2⟩

Share

Metrics

Record views

567

Files downloads

1129