Granular Matter

, 10:235 | Cite as

Cohesive, frictional powders: contact models for tension

Open Access
Article

Abstract

The contacts between cohesive, frictional particles with sizes in the range 0.1–10 μm are the subject of this study. Discrete element model (DEM) simulations rely on realistic contact force models—however, too much details make both implementation and interpretation prohibitively difficult. A rather simple, objective contact model is presented, involving the physical properties of elastic–plastic repulsion, dissipation, adhesion, friction as well as rolling- and torsion-resistance. This contact model allows to model bulk properties like friction, cohesion and yield-surfaces. Very loose packings and even fractal agglomerates have been reported in earlier work. The same model also allows for pressure-sintering and tensile strength tests as presented in this study.

Keywords

Granular materials Molecular dynamics (MD) and discrete elementmodel (DEM) force-laws Friction Rolling- and torsion-resistance Adhesion Plastic deformation 

Notes

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© The Author(s) 2008

Authors and Affiliations

  1. 1.Multi Scale Mechanics, TS, CTW, UTwenteEnschedeNetherlands
  2. 2.Particle Technology, Nanostructured MaterialsDelftChemTech, TNW, TUDelftDelftNetherlands

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