Article révisé par les pairs
| Résumé : | This paper is concerned with a model which attempts to describe quantitatively, by the same elementary process, the yield behaviour above and below Tg, as well as the effect of annealing on the yield stress. This model links together theories we have previously proposed and relies on the following main assumptions: the deformation processes imply the cooperation of n activated segments and that the free energy increase of an activated segment depends on the structural state of the polymer. A satisfactory agreement is found with yield stress data on polycarbonate (PC), over a very large range of temperatures and strain rates. The correlation between the yield stress and the annealing treatment is also reasonable. © 1984. |
