Evolution of shear zones in granular materials

Balázs Szabó, János Török, Ellák Somfai, Sandra Wegner, Ralf Stannarius, Axel Böse, Georg Rose, Frank Angenstein, and Tamás Börzsönyi
Phys. Rev. E 90, 032205 – Published 10 September 2014

Abstract

The evolution of wide shear zones or shear bands was investigated experimentally and numerically for quasistatic dry granular flows in split bottom shear cells. We compare the behavior of materials consisting of beads, irregular grains, such as sand, and elongated particles. Shearing an initially random sample, the zone width was found to significantly decrease in the first stage of the process. The characteristic shear strain associated with this decrease is about unity and it is systematically increasing with shape anisotropy, i.e., when the grain shape changes from spherical to irregular (e.g., sand) and becomes elongated (pegs). The strongly decreasing tendency of the zone width is followed by a slight increase which is more pronounced for rodlike particles than for grains with smaller shape anisotropy (beads or irregular particles). The evolution of the zone width is connected to shear-induced packing density change and for nonspherical particles it also involves grain reorientation effects. The final zone width is significantly smaller for irregular grains than for spherical beads.

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  • Received 3 June 2014

DOI:https://doi.org/10.1103/PhysRevE.90.032205

©2014 American Physical Society

Authors & Affiliations

Balázs Szabó1,*, János Török2, Ellák Somfai1, Sandra Wegner3, Ralf Stannarius3, Axel Böse3, Georg Rose3, Frank Angenstein4, and Tamás Börzsönyi1

  • 1Institute for Solid State Physics and Optics, Wigner Research Center for Physics, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest, Hungary
  • 2Institute of Physics, Budapest University of Technology and Economics, H-1111 Budapest, Hungary
  • 3Otto-von-Guericke University, D-39106 Magdeburg, Germany
  • 4Leibniz Institute for Neurobiology, D-39118 Magdeburg, Germany

  • *szabo.balazs@wigner.mta.hu

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Vol. 90, Iss. 3 — September 2014

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