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Volume 4, Issue 1


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Time-temperature and time-stress correspondence in nonlinear creep. Experimental behaviour of amorphous polymers and quantitative modelling approaches

Dr. José R. S. André
  • Corresponding author
  • Department of Mechanical Engineering, Technology and Management School, Guarda Polytechnic Institute, Avª Dr. Francisco Sá Carneiro, nº 50, 6300-559 Guarda, Portugal; http://www.ipg.pt; Fax 271 220 123
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/ José J. C. Cruz Pinto
  • CICECO, Composite and Ceramic Materials Associate Laboratory / Department of Chemistry, University of Aveiro, Campus of Santiago, 3810-193 Aveiro, Portugal; http://www.dq.ua.pt; Fax 234 370 084
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Published Online: 2013-08-31 | DOI: https://doi.org/10.1515/epoly.2004.4.1.907


Non-linear creep is described by a non-simulative, analytical, dynamic molecular modelling approach. Elementary, molecular-scale, process-relevant frequencies are derived by adequate kinetic formulation. They follow almost exactly an Arrhenius-like behaviour with a range of activation enthalpies. Their relative contribution to the overall macroscopic behaviour of the materials is quantified to account for the materials’ retardation time spectra and final non-Arrhenius behaviour. A new creep compliance equation is derived, yielding a fully coupled timetemperature- stress formulation, with long-term predictive capability. Experimental data for poly(methyl methacrylate) are analysed to identify the extent to which timetemperature and time-stress correspondence relationships may be valid, and it is shown that they are approximations (especially the latter), limited to narrow ranges of experimental variables, in contrast to the proposed model, which more reasonably fits the experimental behaviour.

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Published Online: 2013-08-31

Published in Print: 2004-12-01

Citation Information: e-Polymers, Volume 4, Issue 1, 079, ISSN (Online) 1618-7229, ISSN (Print) 2197-4586, DOI: https://doi.org/10.1515/epoly.2004.4.1.907.

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