Breaking processes in three-dimensional bonded granular materials with general shapes

Galindo-Torres, S. A., Pedroso, D. M., Williams, D. J. and Li, L. (2012) Breaking processes in three-dimensional bonded granular materials with general shapes. Computer Physics Communications, 183 2: 266-277. doi:10.1016/j.cpc.2011.10.001


Author Galindo-Torres, S. A.
Pedroso, D. M.
Williams, D. J.
Li, L.
Title Breaking processes in three-dimensional bonded granular materials with general shapes
Journal name Computer Physics Communications   Check publisher's open access policy
ISSN 0010-4655
1879-2944
Publication date 2012-02
Year available 2011
Sub-type Article (original research)
DOI 10.1016/j.cpc.2011.10.001
Volume 183
Issue 2
Start page 266
End page 277
Total pages 12
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2012
Language eng
Formatted abstract
The paper presents an extension to the spheropolyhedra method for the simulation of granular materials comprising particles of general shapes with bonding. A bonding, cement, or cohesion model for particles sharing common faces is introduced. The bonding force is elastic and has a strain-based breaking threshold for modelling fracture. An initial study is conducted based on the Brazilian tensile test to check how the parameters of the proposed model affect the principal variables measured in this test. Afterwards, solid cubic blocks are then subjected to a triaxial test to explore the mathematical macroscopic failure model. It is found that the peak strength envelope is the product of the superposition of frictional and fracture failure mechanisms. The fracture failure is mainly produced by an avalanche of broken cohesive bonds. The intensity of the avalanche exhibits a power law distribution, as reported in previous studies. The method allows for random divisions of solid bodies without any pre-existing internal voids. It offers a natural, effective tool to model, simulate and study fragmentation processes in 3D.

Highlights: ► We have developed a model for bounded particles with general shapes in 3D. ► The model includes particles produced by the Voronoi tessellation. ► Fragmentation processes in solid blocks without internal voids can be modelled. ► Two validation examples are presented: the Brazilian disk test and the triaxial cell.
Keyword Molecular dynamics
Bonding models
Fragmentation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 10 October 2011.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2012 Collection
 
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Created: Mon, 16 Jan 2012, 19:27:18 EST by Dr Dorival Pedroso on behalf of School of Civil Engineering