[3][4] For example, for a Hookean elastic solid, the relaxation time tc will be infinite and it will vanish for a Newtonian viscous fluid.
The Weissenberg number indicates the degree of anisotropy or orientation generated by the deformation, and is appropriate to describe flows with a constant stretch history, such as simple shear.
In contrast, the Deborah number should be used to describe flows with a non-constant stretch history, and physically represents the rate at which elastic energy is stored or released.
[3][7] In his 1964 paper (a reproduction of his after-dinner speech to the Fourth International Congress on Rheology in 1962),[8][9] Markus Reiner further elucidated the name's origin:[8]“Deborah knew two things.
Time-temperature superposition has to do with altering experimental time scales using reference temperatures to extrapolate temperature-dependent mechanical properties of polymers.
Time-temperature superposition avoids the inefficiency of measuring a polymer's behavior over long periods of time at a specified temperature by utilizing the Deborah number.