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Strain localization in soft rock—a typical rate‐dependent solid: experimental and numerical studies
Author(s) -
Bhandari A. R.,
Inoue J.
Publication year - 2005
Publication title -
international journal for numerical and analytical methods in geomechanics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.419
H-Index - 91
eISSN - 1096-9853
pISSN - 0363-9061
DOI - 10.1002/nag.446
Subject(s) - strain rate , strain (injury) , viscoplasticity , plane stress , materials science , finite element method , shear band , deformation (meteorology) , compression (physics) , infinitesimal strain theory , shear (geology) , geotechnical engineering , mechanics , structural engineering , composite material , geology , constitutive equation , physics , engineering , medicine
Strain localization developing inside soft rock specimens is examined through experimental observation and numerical simulation. In the experimental study, soft rock specimens are sheared at different strain rates under plane strain conditions and deformation and strain localization characteristics are analysed. Transition of localization mode from highly localized mode for higher strain rate to distributed and diffused mode of strain localization for lower strain rates was observed. In the numerical study, simulations of plane strain compression tests are carried out at different strain rates by using an overstressed‐type elasto‐viscoplastic model in finite element computations. The role of strain rates on setting gradients of strain fields across shear band is clarified. The probable mechanism for transition of localization mode is discussed. Copyright © 2005 John Wiley & Sons, Ltd.