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Energy Storage in Cold Non-elastic Deformation of Glassy Polymers by E.F. Oleinik; S.N. Rudnev; O.B. Salamatina; S.V. Shenogin; M.I. Kotelyanskii; T.V. Paramzina; S.I. Nazarenko is a Materials Science article available to read on EtoBox.

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## Abstract Experimental results on work W(ε), heat Q(ε) and stored energy U(ε) of deformation for glassy polymers such as linear PS, PC, PMMA, Polyimid, amorphous PET, thermotropic aromatic polyesters, VectraTM for example, crosslinked epoxy are presented. All the data was obtained by a deformation calorimetry technique. Loading and unloading of samples were performed at room temperature with strain rate έ = 10^-2^ - 10^-4^ sec^-1^ under uniaxial compression up to engineering strains of ε~def~ = 40-50%. During straining all polymers accumulate an excess of the latent energy U(ε). Elastic fraction of the energy is released completely at sample unloading and only residual U~res~(ε) energy is conserved in samples. The latent energy U~res~(ε) grows up to ε~def~ =20-25% and levels off then. Shapes of the U~res~(ε) curves are the same (S-shape) for all polymers. However, the saturation level is different for each polymer. The ratio U(ε)/W(ε) was also measured. It was found that at strains ε~def~ < ε~y~ (ε~y~ - strain at the yield point) U(ε)/W(ε) ≈100%. I.e. all W is stored by sample in a form of U. The ratio decreases up to 60-30% for different polymers at higher strains. Release of th

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Author

E.F. Oleinik; S.N. Rudnev; O.B. Salamatina; S.V. Shenogin; M.I. Kotelyanskii; T.V. Paramzina; S.I. Nazarenko

Publisher

Walter de Gruyter GmbH

Published

2006

Language

EN

Field

Materials Science (Physical Sciences)