DEM investigation of macro- and micro-mechanical properties of rigid-grain and soft-chip mixtures

Junqi Zhang, Xiaobin Chen, Jiasheng Zhang, Peerapong Jitsangiam, Xiang Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)

Abstract

We investigated the macro- and micro-mechanical properties of rigid-grain and soft-chip mixtures (GCMs) through numerical simulations using the discrete element method. We present a novel framework for the discrete modeling of soft chips and rigid grains in conjunction with calibration processes. Several numerical triaxial tests were also performed on GCMs with 0%, 10%, 20%, and 30% volumetric chip contents, P. The simulation results demonstrate that increasing P leads to higher GCM toughness, higher deviatoric peak stress, and higher corresponding shear strain. Higher P also contributes to more volume contraction and less dilation. The friction angles at both the peak and residual state significantly increase with increasing P. In view of the micro-mechanical features, strong contact force chains develop along the loading direction, which results in considerable anisotropy in the peak and residual states. Both the formation of strong force chains and rotation of grains decrease with increasing P, whereas the grain sliding percentage increases. The tensile force is mobilized with shearing and higher P leads to less mobilization of the tensile force. These findings are useful for better understanding the internal structure of GCMs with different soft-chip contents, especially in granular mixture mechanics and geomechanics.

Original languageEnglish
Pages (from-to)128-139
Number of pages12
JournalParticuology
Volume55
DOIs
Publication statusPublished - Apr 2021
Externally publishedYes

Keywords

  • Discrete element method
  • Micro-mechanical properties
  • Rigid–soft mixtures
  • Rubber chips
  • Triaxial test

ASJC Scopus subject areas

  • General Chemical Engineering
  • General Materials Science

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