Depletion forces in athermally sheared mixtures of frictionless disks and rods in two dimensions

Marschall, Theodore A.; Teitel, S.

doi:10.1103/physreve.102.042908

Cited by 2 publications

(1 citation statement)

References 27 publications

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“…For simplicity, particles in granular materials are often treated as disk or sphere in two-and three-dimension, leading to considerable progress, both theoretically [1][2][3], experimentally [4,5] and numerically [4,[6][7][8]. However, this simplification makes it impossible to study a key issue: that grain shapes play a central role in, and correlates strongly with, the macroscopic structural characteristics [9][10][11][12][13]. The obvious next level in modelling grain shapes is by ellipses and ellipsoids and much of the work on such systems has focused on macroscopic nematic ordering.…”

Section: Introductionmentioning

confidence: 99%

Structural characteristics of ordered clusters in packs of ellipses

2021

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Structural characteristics of two-dimensional elliptic granular packs with various aspect ratios and intergranular friction coefficients were studied using the Discrete Element Method (DEM). Isotropic compaction from random unjammed state leads to a jammed state with polycrystals of orientationally ordered clusters (OOC). The OOCs were identified using a cluster labelling algorithm, based on the relative angle Δθ between the major axes of two contacting particles. The threshold value of Δθ was optimised to give the strongest correlation between OOCs and the force chain network. We found that the resulting OOC size distribution decays algebraically with an exponent of −2, independently of grain aspect ratio and material properties.

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Section: Introductionmentioning

confidence: 99%

Structural characteristics of ordered clusters in packs of ellipses

2021

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Frictional granular flows of rod and disk mixtures with particle shape distributions

Liu

Luo

et al. 2021

Physics of Fluids

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Three-dimensional simulations of polydisperse shear flows of rod and disk mixtures are performed using the discrete element method. The effects of particle shape distribution on flow behaviors are investigated assuming that all particles have the same volume and density but different shapes in the simulations. The solid phase stresses and bulk friction coefficients show a strong dependence on the particle alignment and the structural anisotropy of interparticle contacts. The combined effects of interparticle friction and particle shape difference lead to larger stresses for mixtures of different particle shapes than the pure particle species in dense shear flows. For frictionless and frictional flows with particle shape distributions, it is observed that the particle fluctuating velocities follow non-Maxwellian distributions and the fluctuating kinetic energies are unequally partitioned among the different particle species.

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Depletion forces in athermally sheared mixtures of frictionless disks and rods in two dimensions

Cited by 2 publications

References 27 publications

Structural characteristics of ordered clusters in packs of ellipses

Structural characteristics of ordered clusters in packs of ellipses

Frictional granular flows of rod and disk mixtures with particle shape distributions

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