Abstract
We study by means of molecular dynamics simulations of periodic shear
cells, the influence of particle shape on the global mechanical behavior
of dense granular media. At large shear deformation samples with
elongated particles, independent of their initial orientation, reach the
same stationary value for both shear force and void ratio. At the
micro-mechanical level the stress, the fabric and the inertia tensors of
the particles are used to study the evolution of the media. In the case
of isotropic particles the direction of the principal axis of the fabric
tensor is aligned with the one of the principal stress, while for
elongated particles the fabric orientation is strongly dependent on the
orientation of the particles. The shear band width is shown to depend on
the particle shape due to the tendency of elongated particles to
preferential orientations and less rotation.
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