Ceramics-Silikáty 50 (3) 125-129 (2006)

STRUCTURAL RELAXATION OF NBS711 GLASS – RELIABILITY OF THE REGRESSION ESTIMATES OF RELAXATION MODEL

M. Chromčíková, P. Dej

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.

Keywords: Glass, Glass transition, Relaxation phenomena, Thermomechanical analysis