Influence of Micromaterial Heterogeneity on Strain Localization in Granular Materials
Publication: International Journal of Geomechanics
Volume 6, Issue 4
Abstract
Lade’s constitutive model was modified to incorporate the couple stress and the particle’s rotation within the framework of the Cosserat continuum. The finite element equations were implemented in the finite-element program (ABAQUS) to predict the strain localization (shear bands) in granular materials. Material spatial heterogeneity such as local void ratio, particle size, surface roughness and shape indices was mapped into the finite element mesh to account for the local heterogeneity of the material properties. The model was found to respond well to such spatial heterogeneities and the results compare well with experiments. The material spatial distributions were generated using scanning electron microscope and optical microscope images. The surface roughness and the shape indices were found to affect the shear band thickness; a parametric study was performed and such effects were found to be significant. The shear band thickness was found to increase as the surface roughness of the particles, particle size, and the particle angularity index increase while it tends to decrease as the particle sphericity, initial density and the confining pressure increase.
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Acknowledgments
The writers gratefully acknowledge the financial support provided by NASA/George C. Marshall Space Flight Center under Contract No. NASANAS8-01042. They also acknowledge the computational support in software and hardware provided by the Advanced Computational Solid Mechanics Laboratory at Louisiana State University.
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Information & Authors
Information
Published In
International Journal of Geomechanics
Volume 6 • Issue 4 • July 2006
Pages: 248 - 259
Copyright
© 2006 ASCE.
History
Received: Aug 11, 2004
Accepted: Jul 18, 2005
Published online: Jul 1, 2006
Published in print: Jul 2006
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