Abstract
Viscoelastic properties of a Lennard-Jones (LJ) model system studied in a previous work were compared with the behavior of inorganic and organic glass-forming liquids and solid glasses. In the region of small stresses and strains both the LJ model system and “real materials” demonstrate linear behavior. After adjustment of time scales the stress relaxation curves for LJ model and fused silica were found to be similar despite the 16 orders of magnitude difference in viscosities of the liquids. At high stresses the viscosity of the LJ model system drops, stress relaxation occurs faster, and a peak appears in the stress versus time plots for shearing with a constant rate. This phenomenon, well-known for high polymers, has also been observed for inorganic glasses. The curves, Δlog η vs. log σ, that show a drop of viscosity of Rb 2OSiO 2 glass and LJ model at stresses higher than 10 8Pa, are in remarkable agreement. The LJ model is shown to provide a semi-quantitative representation of a variety of glass-forming liquids.
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