Hi everyone, i am trying to write umat subroutine for multi yield surface plasticity model.if its possible give me some information to do my project better and if some body has a similar umat i will be grateful to share it. thanks a lot.

3 Comments
  1. David Mašín
    David Mašín 2 weeks ago

    Dear Kamal, there is umat of sanisand (rotational hardening yield surface + bounding surface) at SoilModels which you can use to learn the procedure of umat setup. Also, you can download hypoplasticity umat, to see how to run explicit Runge-Kutta integration with substep control (this is also in SANISAND version). The rest is up to you, I think. Once you finish your project, do not forget to share it at SoilModels! Regards David

  2. Kamal Paknejad Author
    Kamal Paknejad 2 weeks ago

    thanks a lot dear Mr David for your comment. absolutely it will be my pleasure to share it.

  3. Frank Richter
    Frank Richter 2 weeks ago

    Hello,

    try

    Multilinear kinematic hardening for cyclic plasticity
    http://imechanica.org/node/18733
    Subroutine is accessible

    largely theoretical, without subroutine codes:

    Computational inelasticity / J.C. Simo, T.J.R. Hughes.
    Interdisciplinary applied mathematics; 7
    ISBN 0-387-97520-9
    Chapter 5: Nonsmooth Multisurface Plasticity and Viscoplasticity

    Publication in German:
    Schmidt, J., Kaliske, M. (2006)
    Zur dreidimensionalen Materialmodellierung von Fichtenholz mittels eines Mehrflächen-Plastizitätsmodells
    Three-dimensional material modelling of spruce wood using a multi-surface-plasticity model
    Holz als Roh- und Werkstoff 64:393–402.

    J.P. Bardet and W. Choucair
    A benchmark algorithm for elastoplasticity with multiple yield surfaces
    Soil Dynamics and Earthquake Engineering, 1991, Volume 10, Number 7, October, pages 341-347

    https://www.mathworks.com/matlabcentral/fileexchange/28984-multi-surface-plasticity-model

    Subscribe to and seek assistance from the
    ABAQUS mailing list
    https://groups.yahoo.com/neo/groups/Abaqus/info
    Search the archive of the list before posting in it.
    The list does not accept attachments.

    Or
    http://www.eng-tips.com/threadminder.cfm?pid=799
    or from the ResearchGate discussion forum.

    For advice on mechanics in general, including modeling,
    you can consult
    http://imechanica.org/

    As an introduction get the file
    http://imechanica.org/files/Writing User Subroutines with ABAQUS.pdf

    Simulia Learning Community
    3ds.com/slc

    Good luck

    Frank

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