Overshoot effect in the Janssen granular column: a crucial test for granular mechanics.
We present experimental results on the mechanical behavior of static granular assemblies confined in a vertical column. Our measurements confirm the universal Janssen scaling for the stress saturation curve. We show consequently, in the context of isotropic elasticity, a relation between the Poisson ratio and the granular packing fraction. Moreover, using a systematic study of the overshoot effect created by a top mass equal to the saturation mass, we show behaviors that are reproduced qualitatively by isotropic elastic materials but of a spectacular amplitude in the case of a granular assembly. These experimental results are strong tests for any theory of granular matter.
Ovarlez
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Laboratoire des Milieux Désordonnés et Hétérogènes, CNRS UMR 7603, Université Pierre et Marie Curie, Paris, France.
Fond
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Clément
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