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

Coombs, W.M. and Crouch, R.S. and Augarde, C.E. (2013) 'A unique Critical State two-surface hyperplasticity model for fine-grained particulate media.', Journal of the mechanics and physics of solids., 61 (1). pp. 175-189.


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.

Item Type:Article
Keywords:Two-surface anisotropy, Hyperplasticity, Critical State, Implicit stress integration, Algorithmic tangent.
Full text:(AM) Accepted Manuscript
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Publisher 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.
Date accepted:No date available
Date deposited:07 May 2014
Date of first online publication:January 2013
Date first made open access:No date available

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