caa a22 4500 378903136 CHVBK 20180305123523.0 cr unu---uuuuu 161128e20041201xx s 000 0 eng 10.1515/epoly.2004.4.1.907 doi (NATIONALLICENCE)gruyter-10.1515/epoly.2004.4.1.907 Time-temperature and time-stress correspondence in nonlinear creep. Experimental behaviour of amorphous polymers and quantitative modelling approaches [Elektronische Daten] [José R. S. André, José J. C. Cruz Pinto] 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. © 2013 by Walter de Gruyter GmbH & Co. André José R. S. 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 aut Pinto José J. C. Cruz 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 aut e-Polymers De Gruyter 4/1(2004-12-01), 907-924 2197-4586 4:1<907 2004 4 epoly https://doi.org/10.1515/epoly.2004.4.1.907 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1515/epoly.2004.4.1.907 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- André José R. S. 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 aut NATIONALLICENCE 700 1- Pinto José J. C. Cruz 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 aut NATIONALLICENCE 773 0- e-Polymers De Gruyter 4/1(2004-12-01), 907-924 2197-4586 4:1<907 2004 4 epoly CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter