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.
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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
thanks a lot dear Mr David for your comment. absolutely it will be my pleasure to share it.
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
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or from the ResearchGate discussion forum.
For advice on mechanics in general, including modeling,
you can consult
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As an introduction get the file
http://imechanica.org/files/Writing User Subroutines with ABAQUS.pdf
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Good luck
Frank