The influence of non–associativity on localization and failure in geomechanics based on gradient elastoplasticity
The influence of non–associativity on localization and failure in geomechanics based on gradient elastoplasticity
We present results of a parametric study on shearband formation in geomaterials, examining the influence of material dilatancy on shearband properties. The study is based on a new higher order continuum theory, called gradient elastoplasticity, developed to model localization of deformation. We present results for two problems with different initial stress fields: The biaxial test and the hollow cylinder test. We show that nonassociativity promotes bifurcation at lower deformation, leading to localized deformation and more abrupt final failure. Both the inclination and thickness of the calculated shearbands decrease with increasing nonassociativity. Gradient elastoplasticity is capable of reproducing the experimentally observed localized failure modes, including details such as reorientation of shearband close to a free boundary.
63-74
Zervos, A.
9e60164e-af2c-4776-af7d-dfc9a454c46e
Vardoulakis, I.
12908544-3fc4-4ea6-9068-89ff3e532ff0
Papanastasiou, P.
26755af9-c3b5-4350-b0f0-f83c9fca8e92
January 2007
Zervos, A.
9e60164e-af2c-4776-af7d-dfc9a454c46e
Vardoulakis, I.
12908544-3fc4-4ea6-9068-89ff3e532ff0
Papanastasiou, P.
26755af9-c3b5-4350-b0f0-f83c9fca8e92
Zervos, A., Vardoulakis, I. and Papanastasiou, P.
(2007)
The influence of non–associativity on localization and failure in geomechanics based on gradient elastoplasticity.
International Journal of Geomechanics, ASCE, 7 (1), .
(doi:10.1061/(ASCE)1532-3641(2007)7:1(63)).
Abstract
We present results of a parametric study on shearband formation in geomaterials, examining the influence of material dilatancy on shearband properties. The study is based on a new higher order continuum theory, called gradient elastoplasticity, developed to model localization of deformation. We present results for two problems with different initial stress fields: The biaxial test and the hollow cylinder test. We show that nonassociativity promotes bifurcation at lower deformation, leading to localized deformation and more abrupt final failure. Both the inclination and thickness of the calculated shearbands decrease with increasing nonassociativity. Gradient elastoplasticity is capable of reproducing the experimentally observed localized failure modes, including details such as reorientation of shearband close to a free boundary.
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Published date: January 2007
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Local EPrints ID: 39401
URI: http://eprints.soton.ac.uk/id/eprint/39401
ISSN: 1532-3641
PURE UUID: f3dfce74-bcb8-4968-9137-4387ba28ecee
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Date deposited: 28 Jun 2006
Last modified: 16 Mar 2024 03:32
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Author:
I. Vardoulakis
Author:
P. Papanastasiou
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