Therefore, in this work a unified constitutive model based on the absolute reaction rate theory was attempted to be developed.
Under the absolute reaction rate theory , Valanis and Lalwani  proposed that the internal variable could be expressed as the average displacement of a group of atoms subjected to a certain energy barrier.
It should be pointed out that although the absolute reaction rate theory was adopted from chemistry, the corresponding application to the evolution of material microstructure was widely generalized as the unity of chemistry and physics .
(1) By the internal variable thermodynamics utilization, a viscoplasticity constitutive model that described the relationship between inelastic strain rate and overstress was established under the framework of the absolute reaction rate theory.
Lalwani, "Thermodynamics of internal variables in the context of the absolute reaction rate theory," Journal of Chemical Physics, vol.