Article,
Granular packings of cohesive elongated particles
GRANULAR MATTER, 14 (2, SI): 191-196 (2012)
DOI: 10.1007/s10035-011-0303-2
Abstract
We report numerical results of effective attractive forces on the
packing properties of two-dimensional elongated grains. In deposits of
non-cohesive rods in 2D, the topology of the packing is mainly dominated
by the formation of ordered structures of aligned rods. Elongated
particles tend to align horizontally and the stress is mainly
transmitted from top to bottom, revealing an asymmetric distribution of
local stress. However, for deposits of cohesive particles, the preferred
horizontal orientation disappears. Very elongated particles with strong
attractive forces form extremely loose structures, characterized by an
orientation distribution, which tends to a uniform behavior when
increasing the Bond number. As a result of these changes, the pressure
distribution in the deposits changes qualitatively. The isotropic part
of the local stress is notably enhanced with respect to the deviatoric
part, which is related to the gravity direction. Consequently, the
lateral stress transmission is dominated by the enhanced disorder and
leads to a faster pressure saturation with depth.
