Abstract
Several aspects of anelastic deformation of glassy polymers that cannot be explained in terms of existing theories are considered. Resemblance in the stress-strain response for solids of various natures and structures, including semicrystalline and glassy polymers, organic and inorganic solids, and low-molecular-mass and high-molecular-mass compounds, is analyzed. It was pointed out that the phenomena of the yield peak, strain softening, strain concentration (localization) in narrow shear bands, and transient effects are characteristic of the plastic deformation of any solid. The same is true for differences in the kinetics and mechanism of deformation at low (T def < 0.7T g) and high deformation temperatures (T def > 0.7T g). The mechanism of plastic deformation is discussed in detail for glassy polymers; at microscopic and nanoscale levels, plastic deformation proceeds via two stages: initial nucleation of small-scale shear transformations and their further coalescence. This coalescence leads to the advance of the shear front in the sample and to the nucleation and displacement of classical shear bands. The heat of plastic deformation is released out at the coalescence of shear transformations. It was assumed that shear transformations are responsible for the development and evolution of the yield peak in glassy polymers, strain softening, and other phenomena. The proposed mechanism of deformation in glasses fully agrees with the results of thermodynamic measurements and other experimental data reported in the literature. Computer simulation makes it possible to visualize the scenario of nucleation and evolution of shear transformations at the atomic level.
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Original Russian Text © E.F. Oleinik, S.N. Rudnev, O.B. Salamatina, M.I. Kotelyanskii, 2008, published in Vysokomolekulyarnye Soedineniya, Ser. A, 2008, Vol. 50, No. 5, pp. 773–788.
This work was supported by the Russian Foundation for Basic Research, project no. 05-03-32481, and Chemistry and Materials Science Division, Russian Academy of Sciences, Program of Fundamental Studies no. 3.
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Oleinik, E.T.F., Rudnev, S.N., Salamatina, O.B. et al. Mechanisms of anelastic deformation in solid polymers: Solidlike and liquidlike processes. Polym. Sci. Ser. A 50, 494–506 (2008). https://doi.org/10.1134/S0965545X08050039
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DOI: https://doi.org/10.1134/S0965545X08050039