Shear zones in granular mixtures of hard and soft particles with high and low friction

Aditya Pratap Singh, Vasileios Angelidakis, Thorsten Pöschel, Sudeshna Roy*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Granular materials show inhomogeneous flows characterized by strain localization. When strain is localized in a sheared granular material, rigid regions of a nearly undeformed state are separated by shear bands, where the material yields and flows. The characteristics of the shear bands are determined by the geometry of the system, the micromechanical material properties, and the kinematics at the particle level. For a split-bottom shear cell, recent experimental work has shown that mixtures of hard, frictional and soft, nearly frictionless particles exhibit wider shear zones than samples with only one of the two components. To explain this finding, we investigate the shear zone properties and the stress response of granular mixtures using discrete element simulations. We show that both interparticle friction and elastic modulus determine the shear-band properties and packing density of granular mixtures of various mixing ratios, but their stress response depends strongly on the interparticle friction. Our study provides a fundamental understanding of the micromechanics of shear band formation in granular mixtures.
Original languageEnglish
Pages (from-to)3118-3130
Number of pages13
JournalSoft Matter
Volume20
Issue number14
Early online date28 Feb 2024
DOIs
Publication statusPublished - 14 Apr 2024

Bibliographical note

Publisher Copyright:
© 2024 The Royal Society of Chemistry.

Keywords

  • Condensed Matter Physics
  • General Chemistry

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics

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