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An empirical constitutive equation of integral type for viscoelastic liquids

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Abstract

A 5-constant constitutive equation is proposed. The analytical form for the relaxation modulus as a function of flow conditions was chosen based on experimental data for stress-relaxation in solid polymers. The resulting formulae for the material functions in simple and oscillatory shear flow fulfil the empirical Cox-Merz rule as well as other phenomenological relations formulated by Coleman and Markowitz. The theoretical results are compared with experimental data obtained by Han for various polymer melts. Good agreement between theory and experiment is found.

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Authors and Affiliations

  1. Institut of Organic and Polymer Technology, Technical University of Wrocław, Poland

    R. Steller

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  1. R. Steller
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Steller, R. An empirical constitutive equation of integral type for viscoelastic liquids. Rheol Acta 24, 541–546 (1985). https://doi.org/10.1007/BF01332585

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  • DOI: https://doi.org/10.1007/BF01332585

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