Relaxation time and viscosity of fused silica glass at room temperature
CNR-Istituto Nazionale di Ottica, Largo E. Fermi 6, 50125, Firenze, Italy
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Accepted: 8 July 2011
Published online: 23 September 2011
Cases of long-term deformation of fused silica glass at room temperature attributed to the action of gravity have been reported. Further experimental investigations now provide evidence of time-dependent viscous behavior, with a time constant of the order of 10 years. Data relating to a pair of fused silica reference plates are presented, showing the overall deformation occurred over the years; considerations on the pertaining viscosity with aging are also given. An account of the observed relaxation process in terms of the Kelvin-Voigt model for linear viscoelasticity is provided.
© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg, 2011