The Relaxation of Stress in Fused Silica. Part II. Theoretic
JSGT 1955 V39 T083-T098
The experimental relation: S/S0=f(t)for the release of stress in glass is studied theoretically. It is shown that this relation would be expected, both in a Maxwellian body and in a body exhibiting delayed elasticity. The shape of the stress-relaxation curve is influenced by: (a) the viscosity varying with time; and (b) by delayed elasticity. The delayed elastic effect found in the experiments recorded in the first of these two papers is unlikely to be accounted for by the effect of pressure on the atomic configuration. It is also shown that the empirical equations which Adams & Williamson, and Bailey & Sharp used to express the results of their observations on the annealing of glass can be derived as special cases of the general theory.
J. O. Isard & R. W. Douglas
