Pressure dependence of the electrical transport in granular materials

Regular Article

DOI: 10.1140/epje/i2017-11543-3

Cite this article as:
Creyssels, M., Laroche, C., Falcon, E. et al. Eur. Phys. J. E (2017) 40: 56. doi:10.1140/epje/i2017-11543-3
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Abstract.

We report on systematic measurements of the electrical resistance of one- and three-dimensional (1D and 3D) metallic and oxidized granular materials under uni-axial compression. Whatever the dimension of the packing, the resistance follows a power law versus the pressure (\( R\propto P^{-\alpha}\)), with an exponent \(\alpha\) much larger than the ones expected either with elastic or plastic contact between the grains. A simple model based on a statistical description of the micro-contacts between two grains is proposed. It shows that the strong dependence of the resistance on the pressure applied to the granular media is a consequence of large variabilities and heterogeneities present at the contact surface between two grains. Then, the effect of the three-dimensional structure of the packing is investigated using a renormalization process. This allows to reconcile two extreme approaches of a 3D lattice of widely distributed resistances: the effective medium and the percolation theories.

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Keywords

Flowing Matter: Granular Matter 

Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • M. Creyssels
    • 1
  • C. Laroche
    • 2
  • E. Falcon
    • 2
  • B. Castaing
    • 3
  1. 1.Laboratoire de Mécanique des Fluides et Acoustique, Ecole centrale de LyonCNRS, Univ. de LyonEcullyFrance
  2. 2.Univ. Paris Diderot, Sorbonne Paris Cité, MSC, CNRSParisFrance
  3. 3.Laboratoire des Ecoulements Géophysiques et IndustrielsUniv. Grenoble Alpes, CNRSGrenobleFrance

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