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.
multi yield surface model
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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
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
Hello Frank,
Thanks a lot for your answer. It is very helpful and descriptive.
However, I haven’t managed to find the subroutine you are referring to from http://imechanica.org/node/18733 .
Could you please help me with that?
Also, your comment was in 2018. Do you think there are more sources of Multi-Surface models now? I am specifically interested in implementing the Prevost sand version and if possible using a simple explicit integration scheme like ‘Forward Euler’. Do you have any suggestions regarding that ?
Looking forward to your response.
Best regards,
Dimitris
Hello Dimitrios
“Subroutine is accessible” is misplaced there, sorry. In fact, the material models described on
https://imechanica.org/node/18733
are wired into ABAQUS. They are not subroutines. Use them with parameters and you are done, much like using ELASTIC with two parameters.
For some obscure reason they are not documented in the manuals. At least this was so when I last dealt with ABAQUS.
Study my text on
https://imechanica.org/node/18476
You “only” have to dig for the models.
I advise you to ask around in FEM forums, or contact an ABAQUS representative.
Another option: search online for the term “ABQ_SUPER_ELASTIC”. These are the intial characters prescribed for the material name in the built-in shape memory alloy. From a pdf for this model:
“Note that the NAME parameter on *MATERIAL must start with ABQ_SUPER_ELASTIC_N1D (for beam elements), ABQ_SUPER_ELASTIC_N2D (for plane stress, shell or membrane elements), or ABQ_SUPER_ELASTIC_N3D (for 3D, plane strain or axisymmetric solid elements).”
So, pick the initial part of this string. You get hits in your online search, also to publications in journals. Ask the authors, hopefully they can uncover the model for you or have a more intimate tie to ABAQUS than you might have.
I have no access to ABAQUS any longer and cannot advise you on the sand model.
Good luck,
Frank
Dear Frank,
Thanks a lot for your immediate response and help.
Also thank you for all the information regarding ABAQUS. However, I am mostly interested in scripts or algorithms to see how this type of models (multi-surface) are usually implemented – numerically integrated.
The most helpful paper i have found so far is the one you were suggesting above:
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
Therefore, I will probably start by implementing this algorithm in Matlab and see how it works.
Had you found this publication for your own work, and if yes do you also implement constitutive models?
Looking forward to your response.
Again thanks a lot for your time.
Best regards,
Dimitrios