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              <p>Nous étudions expérimentalement le déplacement horizontal à vitesse constante d’un objet dans une assemblée 2D dense de disques photoélastiques constituant un milieu granulaire modèle. Des études précédentes avaient permis de caractériser un écoulement similaire dans une géométrie verticale et sous gravité [1,2]. Dans cette nouvelle configuration, un capteur d’effort nous permet de mesurer la force exercée par les disques sur l’objet, pendant qu’une caméra enregistre à la fois la position des disques et le réseau des forces de contact entre ces disques. Des techniques de suivi de particules et des mesures optiques utilisant les propriétés de biréfringence des disques permettent d’obtenir les champs de vitesses des disques ainsi que les forces d’interaction. Le tenseur taux de déformation et le tenseur des contraintes peuvent alors être reconstruits localement par l’analyse des images. L’étude de ces tenseurs devrait apporter de nouveaux éléments pour mieux caractériser la rhéologie d’un matériau granulaire. [1] A. Seguin, Y. Bertho, P. Gondret and J. Crassous, Dense Granular Flow around a Penetrating Object: Experiment and Hydrodynamic Model, Phys. Rev. Lett. 107, 048001 (2011) [2] A. Seguin, Y. Bertho, F. Martinez, J. Crassous, and P. Gondret, Experimental velocity fields and forces for a cylinder penetrating into a granular medium, Phys. Rev. E 87, 012201 (2013)</p>
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