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Résumé |
Dilatancy onset refers to the separation between the
low-density states of a granular material, which contract under
infinitesimal shear, from the high-density states, which expand. In
this talk I will describe a model of sand, using a volume/strain
ensemble, which predicts that this onset occurs at a sharply-defined
density, and in fact represents a (continuous) phase transition in the
usual sense of statistical physics. I will also discuss indirect
experimental evidence, concerning elastic shear constants, which seems
to confirm this. |
