TY - JOUR
T1 - Particle shape dependence in 2D granular media
JF - EPL (Europhysics Letters)
Y1 - 2012
A1 - Baptiste Saint-Cyr
A1 - Krzysztof Szarf
A1 - Charles Voivret
A1 - Emilien Azéma
A1 - Vincent Richefeu
A1 - Jean-Yves Delenne
A1 - Gael Combe
A1 - Cécile Nouguier-Lehon
A1 - Pascal Villard
A1 - Philippe Sornay
A1 - Marie Chaze
A1 - Farhang Radjaï
AB - Particle shape is a key to the space-filling and strength properties of granular matter. We consider a shape parameter

η describing the degree of distortion from a perfectly spherical shape. Encompassing most specific shape characteristics such as elongation, angularity and non-convexity, η is a low-order but generic parameter that we used in a numerical benchmark test for a systematic investigation of shape dependence in sheared granular packings composed of particles of different shapes. We find that the shear strength is an increasing function of η with nearly the same trend for all shapes, the differences appearing thus to be of second order compared to η. We also observe a non-trivial behavior of packing fraction which, for all our simulated shapes, increases with η from the random close packing fraction for disks, reaches a peak considerably higher than that for disks, and subsequently declines as η is further increased. These findings suggest that a low-order description of particle shape accounts for the principal trends of packing fraction and shear strength. Hence, the effect of second-order shape parameters may be investigated by considering different shapes at the same level of η.

VL - 98
IS - 4
JO - EPL
ER -