Journal
ENGINEERING FRACTURE MECHANICS
Volume 69, Issue 17, Pages 1891-1906Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0013-7944(02)00067-X
Keywords
constitutive modeling; rock; shear bands; compaction bands
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Alternative constitutive models are employed to examine localization conditions for high porosity sandstone. Two deformation types are considered: shear bands and compaction bands (planar zones of pure compressional deformation, perpendicular to maximum compression). The proposed two-yield surface model, motivated in part by observations of two microstructural damage mechanisms, consists of a shear yield surface (dilatant, frictional mechanism), combined with a cap (compactant mechanism). Results from this model are consistent with limited experimental observations: both band types are permitted for probable values of key material parameters. Conversely, the single-yield surface model, previously employed for sandstone, cannot predict the observed compaction bands. (C) 2002 Elsevier Science Ltd. All rights reserved.
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