Annealing of Glass

Effects of Annealing on Enthalpy Relaxation in Lyophilized Disaccharide Formulations: Mathematical Modeling of DSC Curves

“…Nonlinearity in structural relaxation is mathematically treated using the TNM model. Narayanaswamy28, 29 introduced a generalized version of the Arrhenius expression for the relaxation time which was later modified by Moynihan30, 31 and is known as the TNM expression: where A is a preexponential parameter, x is the nonlinearity parameter, and Δ h is the activation energy for structural relaxation. The first term in Eq.…”

Contact residual stress relaxation in soda-lime glass

“…9(a and b) shows that the relaxation profile changes from one sub-region of the near-field to another, and differs for each temperature. This implies that it is not possible to describe the stress relaxation of the Vickers residual stress field with a single master curve (see for example, Kurkjian, 29 Narayanawasmy, 30 Larsen et al, 31 and van den Brink 32 ) either for a particular temperature or for a range of temperatures. Stress relaxation must be described for each point in the stress field or at best for each well-defined sub-region.…”

Identification of Relaxation Functions in Glass by Mean of a Simple Experiment

“…This solution was later used by Narayanaswamy, 7 to describe tempering of a glass plate. A review of the related work can be found in Narayanaswamy 8 …”

“…Figure 1 illustrates the variations of the plate thickness, and the true and fictive temperatures for values of the material properties and boundary conditions taken from Narayanaswamy 8 , when available. The initial plate thickness, b 0 , and temperature, T 0 , are 0.305 cm and 973.15 K, respectively.…”