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Laboratoire des Milieux Désordonnés et Hétérogènes
Université Pierre et Marie Curie, B26
4 Place Jussieu 75252 Paris cedex 05
jer@ccr.jussieu.fr
| We apply a point load onto a bidimensional packing of elastic grains. The internal state of stress is accessed by means of photoelastic visualization. The region in which the stress response is confined exhibits a parabolic profile. This evidence supports the parabolic nature of the equations describing the stress transmission. Our results oppose classical elasto-plastic models of continuum mechanics, and other recent hyperbolic proposals. |
full paper (pdf, 184 Kb)