Material instabilities of anisotropic saturated multiphase porous media

H. W. Zhang, L. Zhou, B. A. Schrefler

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

This paper analyses the material instability of fully saturated multiphase porous media. On account of the fact that anisotropic mechanical behaviours are widely observed in saturated and partially saturated geomaterials, the anisotropic constitutive model developed by Rudnicki for geomaterials is used to model the anisotropic mechanical behaviour of the solid skeleton of saturated porous geomaterials in axisymmetric compression test. The inertial coupling effect between solid skeleton and pore fluid is also taken into account in dynamic cases. Conditions for static instability (strain localisation) and dynamic instability (stationary discontinuity and flutter instability) of fully saturated porous media are derived. The critical modulus, shear band angle for strain localisation, and the bound within which flutter instability may occur are given in explicit forms. The effects of material parameters on material instability are investigated in detail by numerical computations.

Original languageEnglish (US)
Pages (from-to)713-727
Number of pages15
JournalEuropean Journal of Mechanics, A/Solids
Volume24
Issue number5
DOIs
StatePublished - Sep 2005

Keywords

  • Anisotropy
  • Flutter instability
  • Porous medium
  • Stationary discontinuity
  • Strain localisation

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials

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