The Influence of Delayed Elasticity on the Rate of Annealing of Glass

JSGT 1947 V31 T218-T227

It is shown that the influence of delayed elasticity on the rate of annealing of glass can be very significant, particularly in the early stages of an annealing process. There is no reason to expect the annealing rate to be “Maxwellian”; moreover, the true law of annealing rate cannot be determined until more data are available about the delayed elastic effects. In previous investigations on the subject, the influence of delayed elasticity has not been recognised as such, but has been confused with the change in viscosity which also proceeds continuously at temperatures in the annealing range. In spite of this confusion, past workers have accounted for their experimental results to a fair degree of approximation; the error must, however, lead to anomalies and probably accounts for those which remain in the work of H. R. Lillie and others.

G. O. Jones