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Biblioteca Digital do IPG >
Escola Superior de Tecnologia e Gestão (ESTG) >
Artigos em Revista Internacional (ESTG) >
Utilize este identificador para referenciar este registo:
http://hdl.handle.net/10314/3395
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| Título: | Time-Temperature and Time-Stress Correspondence in Non-Linear Creep-Experimental Amorphous Polymer Behaviour and Quantitative Modelling Approaches |
| Autores: | André, José Reinas
José, Cruz Pinto |
| Palavras Chave: | poly(methyl methacrylate)
creep |
| Data: | 2004 |
| Editora: | e-ppolymers |
| Resumo: | 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 |
| URI: | http://hdl.handle.net/10314/3395 |
| ISSN: | 1618-7229 |
| Aparece nas Colecções: | Artigos em Revista Internacional (ESTG)
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Ficheiros deste Registo:
| Ficheiro |
Descrição |
Tamanho | Formato |
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| art_e_polymer_141204.pdf | | 70Kb | Adobe PDF | Ver/Abrir | |
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