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      Granular contact interfaces with non-circular particles

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      Author
      Temizer, I.
      Date
      2013
      Source Title
      Tribology International
      Print ISSN
      0301-679X
      Publisher
      Elsevier
      Volume
      67
      Pages
      229 - 239
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      The influence of particle geometry on the macroscopic frictional response of granular interfaces is investigated via computational contact homogenization. The particle shape is parametrized by convex superellipse geometries that require iterative closest-point projection schemes for modeling the persistent rolling contact of the particle between a rigid smooth surface and a rubber-like material. Normal and tangential forces acting on the particle are computed by the discrete element method. The non-Amontons and non-Coulomb type macroscopic frictional response of the three-body system is linked to microscopic dissipative mechanisms. Numerical investigations demonstrate rolling resistance and additionally suggest that the macroscopic friction from a complex interface particle geometry may be bound by computations that are based on simplified shapes which geometrically bound the original one. © 2013 Elsevier Ltd.
      Keywords
      Contact homogenization
      Granular interface
      Macroscopic friction
      Superellipse
      Closest-point projections
      Dissipative mechanisms
      Frictional response
      Numerical investigations
      Particle geometries
      Permalink
      http://hdl.handle.net/11693/20808
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.triboint.2013.08.005
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