Microdisplacements induced by a local perturbation inside a granular packing.
The microdisplacements generated by a small localized overload at the free surface are visualized experimentally inside a packing of steel beads. For a triangular packing, beads rearrangements remain confined in two inverted triangles on both sides of the applied overload. This pattern disappears for stronger disorder. A simple model allows us to account for these observations and to relate them to the stress function response measured via photoelastic visualizations. This provides a different tool to probe the mechanical Green's function in weakly confined packings of rigid grains the description of which is the most challenged.
Bonamy
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Service de Physique de l'Etat Condensé, CEA Saclay, 91191 Gif sur Yvette, France.
Bernard-Bernardet
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Daviaud
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Laurent
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