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On the ageing of polymers and the time‐shifting procedure
Author(s) -
Creus G. J.
Publication year - 2015
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201500425
Subject(s) - viscoelasticity , equivalence (formal languages) , ageing , hardening (computing) , representation (politics) , softening , context (archaeology) , mathematics , materials science , computer science , composite material , pure mathematics , geology , biology , genetics , paleontology , layer (electronics) , politics , political science , law
The time‐shifting procedure, originally developed for time‐temperature equivalence in the modelling of polymers mechanical behaviour, has later on been extended to time‐age equivalence. The present paper discusses both situations in the context of linear viscoelastic behaviour, from the point of view of mathematical representation and the fitting of experimental data. The general equations in the cases of ageing and non‐ageing are introduced and the cases of hardening and softening types of ageing are precisely characterised. Situations in which time shifting can prove effective are delimited and alternative more general expressions are proposed.