Multi-scale modelling of granular materials: numerical framework and study on micro-structural features

J. Liu, E. Bosco (Corresponding author), A.S.J. Suiker

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

A multi-scale model for the analysis of granular systems is proposed, which combines the principles of a coupled FEM–DEM approach with a novel servo-control methodology for the implementation of appropriate micro-scale boundary conditions. A mesh convergence study is performed, whereby the results of a quasi-static biaxial compression test are compared with those obtained by direct numerical simulations. The comparison demonstrates the capability of the multi-scale method to realistically capture the macro-scale response, even for macroscopic domains characterized by a relatively coarse mesh; this makes it possible to accurately analyse large-scale granular systems in a computationally efficient manner. The multi-scale framework is applied to study in a systematic manner the role of individual micro-structural characteristics on the effective macro-scale response. The effect of particle contact friction, particle rotation, and initial fabric anisotropy on the overall response is considered, as measured in terms of the evolution of the effective stress, the volumetric deformation, the average coordination number and the induced anisotropy. The trends observed are in accordance with notions from physics, and observations from experiments and other DEM simulations presented in the literature. Hence, it is concluded that the present framework provides an adequate tool for exploring the effect of micro-structural characteristics on the macroscopic response of large-scale granular structures.

LanguageEnglish
Pages409–427
Number of pages19
JournalComputational Mechanics
Volume63
Issue number2
DOIs
StatePublished - 1 Feb 2019

Fingerprint

Multiscale Modeling
Granular Materials
Granular materials
Macros
Anisotropy
Direct numerical simulation
Physics
Boundary conditions
Mesh
Friction
Finite element method
Multiscale Model
Multiscale Methods
Biaxial
Compression
Experiments
Contact
Framework
Methodology
Demonstrate

Keywords

  • FEM–DEM coupled simulations
  • Micro-structural features
  • Multi-scale modelling
  • Particle aggregates

Cite this

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Multi-scale modelling of granular materials : numerical framework and study on micro-structural features. / Liu, J.; Bosco, E. (Corresponding author); Suiker, A.S.J.

In: Computational Mechanics, Vol. 63, No. 2, 01.02.2019, p. 409–427.

Research output: Contribution to journalArticleAcademicpeer-review

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