A constitutive model with microstructure evolution for flow of rate-independent granular materials

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Abstract

A constitutive model is developed for the complex rheology of rate-independent granular materials. The closures for the pressure and the macroscopic friction coefficient are linked to microstructure through evolution equations for coordination number and fabric. The material constants in the model are functions of particle-level properties and are calibrated using data generated through simulations of steady and unsteady simple shear using the discrete element method (DEM). This model is verified against DEM simulations at complex loading conditions.

Original languageEnglish (US)
Pages (from-to)590-616
Number of pages27
JournalJournal of Fluid Mechanics
Volume682
DOIs
StatePublished - Sep 10 2011

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Keywords

  • granular media
  • rheology

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