Ceramics-Silikáty 50, (3) 125 - 129 (2006) |
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STRUCTURAL RELAXATION OF NBS711 GLASS – RELIABILITY OF THE REGRESSION ESTIMATES OF RELAXATION MODEL
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Chromčíková Mária, Dej Peter
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Vitrum Laugaricio (VILA) - Joint Glass Center of the Institute of Inorganic Chemistry SAS,
Alexander Dubček University of Trenčín,
and RONA Lednické Rovne, Študentská 2, 911 50 Trenčín, Slovak Republic
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Keywords: Glass, Glass transition, Relaxation phenomena, Thermomechanical analysis
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Thermomechanical experiments with different zigzag time temperature regimes and different applied axial loads were performed
on viscosity standard glass NBS711. Experimental data were described by the Tool-Narayanaswamy-Moynihan's and
Mazurin's model using the non-linear regression analysis. Both applied models described the experimental data with sufficient
accuracy. It was found, that the statistically robust estimates of the regression model parameters can be obtained only
if more TMA experiments with different zigzag time-temperature schedule are combined. The use of higher loads is preferable. |
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