Flow structure of granular media
Résumé
By means of three-dimensional Contact Dynamics (CD) simulations, we investigate the
microstructural properties of sheared granular packings by varying systematically the inertial
number I from the quasi-static regime, to the intermediate dense flow and collisional regime
[1]. A detailed analysis of the connectivity of the particles reveals that the transition between
the regimes is correlated to profound changes of the nature of the contact network. In
particular, we show that the increase of friction angle with inertial number is only a
consequence of contact anisotropy. As the inertial number increases, the role of force chains
decrease and that of friction mobilization increases as long as percolating force chains are
present in the system. Beyond this point, which corresponds to an inertial number I0~0.25,
the force anisotropies do not evolve with the inertial number.
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