We report a method for describing plasticity in a broad class of amorphousmaterials. The method is based on nonlinear (geometric) deformation theoryallowing the separation of the plastic deformation from the general deformationtensor. This separation allows an adequate pattern of thermodynamical phenomenafor plastic deformations in polymers to be constructed. A parameter describingthe stress relaxation rate of the material is introduced within the frame ofthis approach. Additionally, several experimental configurations to measurethis parameter are discussed.
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