The method proposed in this paper allows one to estimate reversible and irreversible changes in the internal structure of a material on the basis of the correlation between phenomena observed in experiments and the components of the specific work done by internal forces. The nonlinear endochronic theory of aging viscoelastic materials is considered together with an example illustrating the dependence of stress-strain state on the specific energy of aging and on the following specific energies: instantaneously reversible, slowly reversible, dissipated, and absorbed.
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