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Integration and calibration of a plasticity model for granular materials
Author(s) -
Jacobsson L.,
Runesson K.
Publication year - 2002
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.200
Subject(s) - constitutive equation , plasticity , granular material , isotropy , ballast , hardening (computing) , calibration , triaxial shear test , computer science , mathematics , geotechnical engineering , geology , structural engineering , engineering , materials science , finite element method , physics , petrology , oceanography , statistics , layer (electronics) , quantum mechanics , composite material , shear (geology)
A new macroscopic constitutive model for non‐cohesive granular materials, with the focus on coarse‐sized materials (railway ballast), is presented. The model is based on the concepts of rate‐independent isotropic plasticity. The Backward Euler rule is used for integrating the pertinent evolution equations. The resulting incremental relations are solved in the strain space that is extended with the internal (hardening) variables. The model is calibrated using data from Conventional Triaxial Compression (CTC) tests, carried out at the University of Colorado at Boulder. A function evaluation method is used for the optimization, whereby a ‘multi‐vector’ strategy for choosing the appropriate start vector is proposed. Copyright © 2002 John Wiley & Sons, Ltd.