Rheology of cohesive granular materials across multiple dense-flow regimes

Yile Gu, Sebastian Chialvo, Sankaran Sundaresan

Research output: Contribution to journalArticle

31 Scopus citations

Abstract

We investigate the dense-flow rheology of cohesive granular materials through discrete element simulations of homogeneous, simple shear flows of frictional, cohesive, spherical particles. Dense shear flows of noncohesive granular materials exhibit three regimes: quasistatic, inertial, and intermediate, which persist for cohesive materials as well. It is found that cohesion results in bifurcation of the inertial regime into two regimes: (a) a new rate-independent regime and (b) an inertial regime. Transition from rate-independent cohesive regime to inertial regime occurs when the kinetic energy supplied by shearing is sufficient to overcome the cohesive energy. Simulations reveal that inhomogeneous shear band forms in the vicinity of this transition, which is more pronounced at lower particle volume fractions. We propose a rheological model for cohesive systems that captures the simulation results across all four regimes.

Original languageEnglish (US)
Article number032206
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume90
Issue number3
DOIs
StatePublished - Sep 12 2014

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

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