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Mechanism of plastic deformation for polycarbonate under compression by a laser extensometer technique
Author(s) -
Spathis G.,
Kontou E.
Publication year - 2001
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/1097-4628(20010401)79:14<2534::aid-app1062>3.0.co;2-g
Subject(s) - extensometer , materials science , viscoelasticity , composite material , polycarbonate , deformation (meteorology) , viscoplasticity , plasticity , strain rate , softening , constitutive equation , compression (physics) , structural engineering , finite element method , engineering
The large strain behavior of a glassy polymer was studied in terms of compression tests at various rates, while the local deformation was evaluated with a noncontact laser extensometer. The main features of yield and postyielding were described with a constitutive model from nonlinear viscoelasticity, combined with a kinematic formulation for the separation of total deformation into a viscoelastic and a plastic part, respectively. The concept of plastic shear transformations introduced elsewhere was used to develop a mathematical model for the rate of plastic deformation. The entire experimental true stress–strain curves (including strain hardening and strain softening) could, through this model, be identified in a self‐consistent manner. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 79: 2534–2542, 2001