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How to model orthotropic linear viscoelastic model in VUMAT

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  • How to model orthotropic linear viscoelastic model in VUMAT

    Hi, all

    I am doing on a research about heat generation of composite material under cyclic loading using ABAQUS. The material has different in different direction. I am trying to use model the material as orthotropic linear viscoelatic. But I can't find any option in ABAQUS. Does anyone knows how to model it in VUMAT?

    Thanks!
    Ziwei Zeng
    Mechanical engineering department, University of Michigan

  • #2
    Hello

    you will find some information on UMAT in these publications, though without code and not for VUMAT:

    On the basic laws of anisotropic viscoelasticity
    Valery S. Volkov & Valery G. Kulichikhin
    Rheol Acta (2007) 46:1131–1138

    Modelling of Anisotropic Viscoelastic Behaviour in Super-Pressure Balloons
    American Institute of Aeronautics and Astronautics
    T. Gerngross and S. Pellegrino
    http://www-civ.eng.cam.ac.uk/dsl/pub...ns/Anisotropic viscoelastic behaviour.pdf

    THREE-DIMENSIONAL VISCOELASTIC MODEL WITH NONCONSTANT COEFFICIENTS
    By M. Fafard, M. T. Boudjelal, B. Bissonnette, and A. Cloutier
    JOURNAL OF ENGINEERING MECHANICS / AUGUST 2001 page 808-815

    Contribution à la prédiction des conséquences mécaniques des phénomènes thermo-hydriques couplés: application au bois
    = A contribution to the prediction of the mechanical consequences of the coupled thermo-hydric phenomena: Application to the wood
    PhD Thesis by Pierre Chassagne
    Institut national des sciences appliquées; Lyon, France, 2006
    chapitre III
    "1.2.3 Solide de Maxwell orthotrope"
    "1.2.4 Solide de Maxwell généralisé orthotrope"
    docinsa-breves.insa-lyon.fr/these/2006/chassagne/these.pdf
    contains some formuals for coding

    Mechanics of Time-Dependent Materials
    June 2007, Volume 11, Issue 2, pp 127-142
    Constitutive equations for orthotropic nonlinear viscoelastic behaviour using a generalized Maxwell model Application to wood material
    Emmanuelle Vidal-Sallé, Pierre Chassagne

    I recommend you become a member of the ABAQUS mailing list
    https://groups.yahoo.com/group/ABAQUS
    and ask there, too.

    Good luck

    Frank

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