Sommaire:

It is generally accepted that the plasticity of amorphous material comes from localized reorganizations, which may produce form large structures of deformation. This description is supposed to describe the plasticity and the failure in numerous experimental systems (emulsions, dense colloidal suspension, metallic glasses,..). However the experimental observations of such behavior are missing. In this seminar, we will discuss an experimental study of the plastic deformation of a granular material. The material is compressed and the deformations are measured using a dynamic light scattering set-up. A intermittent structure of the plastic flow appears. The anisotropy of the deformation are given by the mechanical stress redistributions of isolated events. This structure of the plastic flow is more intense when the failure is approached. However the final failure of the material seems to be driven by the internal solid friction of the material.

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