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Title: Effect of shape and friction on the packing and flow of granular materials

Journal Article · · Physical Review E
 [1];  [2];  [2];  [2];  [2];  [2];  [3]
  1. Army Research Lab., MD (United States). Aberdeen Proving Ground
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  3. Central New Mexico Community College, Albuquerque, NM (United States). School of Math, Science, and Engineering

Here, the packing and flow of aspherical frictional particles are studied using discrete element simulations. Particles are superballs with shape |x|s + |y|s + |z|s = 1 that varies from sphere (s = 2) to cube (s = ∞), constructed with an overlapping-sphere model. Both packing fraction, Φ, and coordination number, z, decrease monotonically with microscopic friction μ, for all shapes. However, this decrease is more dramatic for larger s due to a reduction in the fraction of face-face contacts with increasing friction. For flowing grains, the dynamic friction ~μ —the ratio of shear to normal stresses—depends on shape, microscopic friction, and inertial number I . For all shapes, ˜μ grows from its quasistatic value ˜μ0 as (˜μ - ˜μ0) = dIα, with different universal behavior for frictional and frictionless shapes. For frictionless shapes the exponent α ≈ 0.5 and prefactor d ≈ 5˜μ0 while for frictional shapes α ≈ 1 and d varies only slightly. Lastly, the results highlight that the flow exponents are universal and are consistent for all the shapes simulated here.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
Grant/Contract Number:
AC04-94AL85000; NA0003525
OSTI ID:
1483965
Alternate ID(s):
OSTI ID: 1481230; OSTI ID: 1485843
Report Number(s):
SAND--2018-2025J; 662902
Journal Information:
Physical Review E, Journal Name: Physical Review E Journal Issue: 5 Vol. 98; ISSN PLEEE8; ISSN 2470-0045
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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