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Discrete Element study of granular material — Bumpy wall interface behavior

Author

Listed:
  • El Cheikh, Khadija
  • Rémond, Sébastien
  • Pizette, Patrick
  • Vanhove, Yannick
  • Djelal, Chafika

Abstract

This paper presents a DEM study of a confined granular material sheared between two parallel bumpy walls. The granular material consists of packed dry spherical particles. The bumpiness is modeled by spheres of a given diameter glued on horizontal planes. Different bumpy surfaces are modeled by varying diameter or concentration of glued spheres. The material is sheared by moving the two bumpy walls at fixed velocity. During shear, the confining pressure applied on each bumpy wall is controlled. The effect of wall bumpiness on the effective friction coefficient and on the granular material behavior at the bumpy walls is reported for various shearing conditions. For given bumpiness and confining pressure that we have studied, it is found that the shear velocity does not affect the shear stress. However, the effective friction coefficient and the behavior of the granular material depend on the bumpiness. When the diameter of the glued spheres is larger than about the average grains diameter of the medium, the latter is uniformly sheared and the effective friction coefficient remains constant. For smaller diameters of the glued spheres, the effective friction coefficient increases with the diameter of glued spheres. The influence of glued spheres concentration is significant only for small glued spheres diameters, typically half of average particle diameter of the granular material. In this case, increasing the concentration of glued spheres leads to a decrease in effective friction coefficient and to shear localization at the interface. For different diameters and concentrations of glued spheres, we show that the effect of bumpiness on the effective friction coefficient can be characterized by the depth of interlocking.

Suggested Citation

  • El Cheikh, Khadija & Rémond, Sébastien & Pizette, Patrick & Vanhove, Yannick & Djelal, Chafika, 2016. "Discrete Element study of granular material — Bumpy wall interface behavior," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 457(C), pages 526-539.
    • Handle: RePEc:eee:phsmap:v:457:y:2016:i:c:p:526-539
    DOI: 10.1016/j.physa.2016.03.053
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    References listed on IDEAS

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    1. Kimbonguila Manounou, A. & Rémond, S., 2014. "Discrete element modeling of the microstructure of fine particle agglomerates in sheared dilute suspension," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 412(C), pages 66-83.
    2. Tillemans, Hans-Jürgen & Herrmann, Hans J., 1995. "Simulating deformations of granular solids under shear," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 217(3), pages 261-288.
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    Cited by:

    1. Sun, Weichen & Wu, Kai & Huang, Haibo, 2021. "A graded granular material generation algorithm based on particle number probability distribution by DEM," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 573(C).
    2. El Cheikh, K. & Rémond, S., 2017. "Effect of wall bumpiness on the behavior of sheared dry bidisperse granular material," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 472(C), pages 1-12.

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    2. El Cheikh, K. & Rémond, S., 2017. "Effect of wall bumpiness on the behavior of sheared dry bidisperse granular material," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 472(C), pages 1-12.

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