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The mechanism of plastic deformation of glasses by indentation near room temperature has not been understood completely up to now. For the analysis of indentation experiments with a Vickers pyramid and spherical indenter, respectively, viscoelastic deformation behaviour is assumed for the complete temperature range from room temperature to the transformation temperature. Therefore, the rheological analysis of all experiments was performed with the help of a simple Maxwell model. The results of indentation experiments were compared with cylinder compression experiments, which were analysed by the same rheological principles. Additionally, some indents were analysed by topographical investigation to get the first hints of viscoelastic deformation behaviour below the transformation temperature of glass.

Viscosity of glass at high contact pressure during indentation experiments