Abstract
An approach to description of stress–strain curves in the uniaxial stretching of polymer glasses to the forced elasticity limit is proposed. The equation of the stress–strain curve is a power dependence of reduced stress on reduced strain, where exponent n is the ratio of the elastic modulus of a polymer (at the specified rate of loading and temperature) and the modulus corresponding to the forced elasticity limit at the same temperature. Temperature-time dependences of exponent n for poly(methyl methacrylate) and polycarbonate are measured under the hard regime of loading, at the strain rate from 10–2 to 10–5 s–1, and at temperatures from 60 to 100°С and from 20 to 120°С, respectively. It is shown that exponent n is sensitive to the temperature and the time of loading (strain rate).
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Original Russian Text © N.O. Yakovlev, 2017, published in Vysokomolekulyarnye Soedineniya, Seriya A, 2017, Vol. 59, No. 3, pp. 228–233.
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Yakovlev, N.O. Description of stress–strain curves of polymer glasses. Polym. Sci. Ser. A 59, 310–315 (2017). https://doi.org/10.1134/S0965545X17030208
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DOI: https://doi.org/10.1134/S0965545X17030208