Premium
Calculation of stress–strain curves from relaxation data in the rubbery flow region
Author(s) -
Narkis M.
Publication year - 1971
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/app.1971.070150218
Subject(s) - viscoelasticity , stress relaxation , materials science , strain rate , strain (injury) , polycarbonate , relaxation (psychology) , stress (linguistics) , range (aeronautics) , thermodynamics , composite material , physics , creep , medicine , psychology , social psychology , linguistics , philosophy
Stress relaxation curves for polysulfone and Lexan polycarbonate are only time dependent at a constant temperature if strain is defined as ϵ H = In ( l / l 0 ) and the “true” cross‐sectional area A = A 0 /(1 + ϵ) is used. The strain‐independent stress relaxation curves can be used to calculate stress–strain curves at different rates of strain according to the linear viscoelastic theory. The agreement between experimental and calculated stress–strain curves is good at least up to about 60% strain in the range of 0.01 to 0.2 in./min rate of extension if an average rate of strain defined by ϵ H = 1/ t ln( l / l 0 ) is used.