A comparative study of Maxwell viscoelasticity at large strains and rotationsl

Christoph E. Schrank, Ali Karrech, David A. Boutelier, Klaus Regenauer-Lieb

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    Abstract

    We present a new Eulerian large-strain model for Maxwell viscoelasticity using a logarithmic co-rotational stress rate and the Hencky strain tensor. This model is compared to the small-strain model without co-rotational terms and a formulation using the Jaumann stress rate. Homogeneous isothermal simple shear is examined for Weissenberg numbers in the interval [0.1; 10]. Significant differences in shear stress and energy evolution occur at Weissenberg numbers > 0.1 and shear strains > 0.5. In this parameter range, the Maxwell-Jaumann model dissipates elastic energy erroneously and thus should not be used. The small-strain model ignores finite transformations, frame indifference and self-consistency. As a result, it overestimates shear stresses compared to the new model and entails significant errors in the energy budget. Our large-strain model provides an energetically consistent approach to simulating non-coaxial viscoelastic deformation at large strains and rotations.

    Original languageEnglish
    Pages (from-to)252-262
    Number of pages11
    JournalGeophysical Journal International
    Volume211
    Issue number1
    DOIs
    Publication statusPublished - Oct 2017

    Projects

    Finite Strain with Large Rotations - A New Hybrid Numerical Experimental Approach

    Karrech, A., Regenauer-Lieb, K., Schrank, C. & Boutelier, D. A.

    Australian Research Council

    1/01/1431/12/16

    Project: Research

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