Nonassociated and coupled flow rules of elastoplasticity for rock-like materials

TitleNonassociated and coupled flow rules of elastoplasticity for rock-like materials
Publication TypeJournal Article
Year of Publication1979
AuthorsG Maier, and T Hueckel
JournalInternational Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts
Volume16
Issue2
Start Page77
Pagination77 - 92
Date Published01/1979
Abstract

Incremental elastoplastic stress-strain relations are studied which allow for non association of plastic strain rates with the (smooth) current yield surface (non-normality), and/or changing elastic moduli because of plastic deformations (elastoplastic coupling). These circumstances, often accompanied by strainsoftening, are significant in various geotechnical media, particularly rocks. On the basis of a suitable description of the rate relations, various ranges of the hardening modulus are established and their distinct behavioural characteristics, such as rate response uniqueness and material stability (or lack thereof) are systematically studied and interpreted in mechanical terms. Specialization to the standard compression tests and for particular forms of constitutive laws is made. Similarities to and differencies from the traditional associated flow rules of elastoplasticity are pointed out. © 1979.

DOI10.1016/0148-9062(79)91445-1
Short TitleInternational Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts