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M. Urbaniak

The Eyring and Robertson models of EPY® epoxy material

Polimery 2008, No 1, 40


DOI: dx.doi.org/10.14314/polimery.2008.040

Summary

The article presents the results of investigation of the effects of temperature (23-100°C) and compressive strain rate (0.0208-20.8min-1) on the mechanical characteristics of post-cured (at 80°C, 2h) EPY® epoxy material (applied for machine foundation chocks) and on the values of its selected strength parameters (Fig. 1-6). The possibilities of use of Eyring and Robertson plastic deformation theories to predict the yield stress (σyT) of this polymer, dependently on the temperature and strain rate were verified. So the agreement of σyT values experimentally determined and calculated on the basis of the theories has been evaluated for the whole mentioned ranges of temperature and strain rate values (Fig. 7 and 8). The good agreement obtained indicates the usefulness of both theoretical models tested for prediction of true limiting yield stress of the polymeric material investigated. This makes possible to predict the material behavior in various service conditions.


Key words: epoxy material, yield stress, prediction, Eyring model, Robertson model, strain rate, temperature


e-mail: magdalena.urbaniak@ps.pl


M. Urbaniak

The Eyring and Robertson models of EPY® epoxy material