Abstract
Several observations of non-Newtonian viscosity of silicate liquids at high stress or strain rates have been published in recent years. However, this phenomenon is not well understood yet. In this paper attention is drawn to the fact that steady state logarithmic values of reduced viscosities of silicate liquids under high stress show a linear dependence on the squared value of the applied stress. This relationship suggests that the elastic work done by the stress on the liquid is related to the observed viscosity decreases. It is shown that the development of non-Newtonian viscosity in silicate melts under high stress can be explained with the Adam and Gibbs (1965) theory, if one accepts that this elastic work generates configurational entropy.
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