Modelling of nonlinear viscoelastic polymeric materials at their large periodic deformation

0499215 - ÚH 2020 RIV HU eng J - Článek v odborném periodiku
Cherpakova, N.A. - Pyshnograi, G.V. - Filip, Petr - Pivokonský, Radek
Modelling of nonlinear viscoelastic polymeric materials at their large periodic deformation.
Epitoanyag: journal of silicate based and composite materials. Roč. 71, č. 1 (2019), s. 2-4. ISSN 0013-970X
Grant CEP: GA ČR GA17-26808S
Institucionální podpora: RVO:67985874
Klíčová slova: rheology * rheological model * non-linear viscoelasticity * oscillations * shear * polymers solutions
Obor OECD: Fluids and plasma physics (including surface physics)
Způsob publikování: Open access

Analyzing the behavior of flows of polymers solutions and melts in the area of non-linear viscoelasticity allows to estimate more precisely the adequacy of the rheological model and to
describe the material structure in more detail. Today a lot of models describe non-linear properties of polymeric materials rather accurately. However, the formulation of a uniform rheological model
remains open. Therefore this work considers the modified Vinogradov-Pokrovsky rheological model which formed the basis for numerical calculations for periodic deformation of shear flows
of polymeric liquids with a large amplitude. The non-linear viscoelastic properties shown in the course of the research of behavior of polymeric material at large deformations were studied by
means of the immediate analysis of time dependence of shear stresses which were calculated at various amplitudes. It was stated that when increasing the amplitude of deformation the response
stops being the exact harmonica, and a “step” on the left-hand front appears. It manifests the nonlinear response of a sample. The work compares obtained theoretical dependences and the
experimental data for 5% mass solutions of the polyethylene oxide in dimethylsulfoxide which was studied at harmonic deformations with the large amplitude reaching 40 relative units. These
dependences were measured at 35°C and the frequency of 0.2 Hz. Despite its simplicity, the modified Vinogradov-Pokrovsky rheological model shows good compliance with the experimental
data. The results show that the chosen model adequately describes behavior of polymeric materials at large periodic deformations. Therefore this model may be applied for modeling more
complex flows of fluid polymeric environments.
Trvalý link: http://hdl.handle.net/11104/0294954