Micromechanical analysis of failure propagation in frictional granular materials

Tordesillas, Antoinette and Jingyu, Shi (2009) Micromechanical analysis of failure propagation in frictional granular materials. International Journal for Numerical and Analytic Methods in Geomechanics, 33 15: 1737-1768. doi:10.1002/nag.792

Author Tordesillas, Antoinette
Jingyu, Shi
Title Micromechanical analysis of failure propagation in frictional granular materials
Journal name International Journal for Numerical and Analytic Methods in Geomechanics   Check publisher's open access policy
ISSN 0363-9061
Publication date 2009-10-25
Sub-type Article (original research)
DOI 10.1002/nag.792
Open Access Status Not Open Access
Volume 33
Issue 15
Start page 1737
End page 1768
Total pages 32
Place of publication Bognor Regis, West Sussex, United Kingdom
Publisher John Wiley & Sons
Language eng
Abstract The extent to which the evolution of instabilities and failure across multiple length scales can be reproduced with the aid of a bifurcation analysis is examined. We adopt an elastoplastic micropolar constitutive model, recently developed for dense cohesionless granular materials within the framework of thermomicromechanics. The internal variables and their evolution laws are conceived from a direct consideration of the dissipative mechanism of force chain buckling. The resulting constitutive law is cast entirely in terms of the particle scale properties. It thus presents a unique opportunity to test the potential of micromechanical continuum formulations to reproduce key stages in the deformation history: the development of material instabilities and failure following an initially homogeneous deformation. Progression of failure, initiating from frictional sliding and rolling at contacts, followed by the buckling of force chains, through to macroscopic strain softening and shear banding, is reproduced. Bifurcation point, marking the onset of shear banding, occurred shortly after the peak stress ratio. A wide range of material parameters was examined to show the effect of particle scale properties on the progression of failure. Model predictions on the thickness and angle of inclination of the shear band and the structural evolution inside the band, namely the latitudinal distribution of particle rotations and the angular distributions of contacts and the normal contact forces, are consistent with observations from numerical simulations and experiments.
Keyword Granular materials
Shear band
Constitutive relation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
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Created: Thu, 13 Oct 2011, 21:11:26 EST by Dr Jingyu Shi on behalf of Earth Systems Science Computational Centre