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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
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Submitted on : Thursday, April 1, 2010 - 11:36:28 AM
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  • HAL Id : tel-00350277, version 2



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⟩



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