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A unique Critical State two-surface hyperplasticity model for fine-grained particulate media

Coombs, W.M.; Crouch, R.S.; Augarde, C.E.

A unique Critical State two-surface hyperplasticity model for fine-grained particulate media Thumbnail


Authors

R.S. Crouch



Abstract

Even mild compression can cause re-arrangement of the internal structure of clay-like geomaterials, whereby clusters of particles rotate and collapse as face-to-face contacts between the constituent mineral platelets increase at the expense of edge-to-face (or edge-to-edge) contacts. The collective action of local particle re-orientation ultimately leads to path-independent isochoric macroscopic deformation under continuous shearing. This asymptotic condition is the governing feature of Critical State elasto-plasticity models. Unlike earlier formulations, the two-surface anisotropic model proposed herein is able to reproduce a unique isotropic Critical State stress envelope which agrees well with test data. Material point predictions are compared against triaxial experimental results and five other existing constitutive models. The hyperplastic formulation is seen to offer a significantly improved descriptor of the anisotropic behaviour of fine-grained particulate materials.

Journal Article Type Article
Publication Date Jan 1, 2013
Deposit Date Oct 26, 2011
Publicly Available Date May 7, 2014
Journal Journal of the Mechanics and Physics of Solids
Print ISSN 0022-5096
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 61
Issue 1
Pages 175-189
DOI https://doi.org/10.1016/j.jmps.2012.08.002
Keywords Two-surface anisotropy, Hyperplasticity, Critical State, Implicit stress integration, Algorithmic tangent.
Public URL https://durham-repository.worktribe.com/output/1503266

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Copyright Statement
NOTICE: this is the author’s version of a work that was accepted for publication in Journal of the Mechanics and Physics of Solids. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of the Mechanics and Physics of Solids, 61, 1, 2013, 10.1016/j.jmps.2012.08.002.






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