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.
Related Articles
-
Question about Interface between UMAT and VUMAT
Hello, I read the research report and the FORTRAN code available at https://soilmodels.com/download/vumat_umatinterface-zip/. It sounds quite interesting but I have a couple of questions about the FORTRAN code: 1- Did […] -
Triaxial Callibration test with Hypoplasticity
Dear all I am trying to calibrate the HP for sand, and I have quite comprehensive data. but they are not totally consistent with each other . we have the […] -
Spurious oscillations in calculated accelerations
Hello everyone, I have just a general question how people approach the problem of spurious oscillations generated in dynamic analysis when using nonlinear soil constitutive models. I understand sometimes numerical […] -
Hardening parameters (yield stress & absolute plastic strain)
Hi to everyone I want to model a Sand with Cap plasticity or Drucker Prager failure criterion in ABAQUS, and I have the result of Triaxial test (I’ve attached the […] -
Errors of sand hypoplastic model with Abaqus Vumat
Dear all, Recently, I have been working on the simulation of a pile-soil interaction with CEL method in Abaqus/Explicit. I simulate the sand with the Sand Hypoplasticity Model provided by […] -
Undrained Tests with Basic Clay Hypoplasticity
Hi Prof. David, I have obtained these results in that attached picture using Triax and got confused when seeing that an isotopically normally consolidated sample does not follow a trend […] -
Abaqus user defined field
Hi, I am going to use the usdfld to function the density of sand changing due to confining pressure. I am not sure Abaqus will call the usdfld for every […] -
ABAQUS Linking With Fortran Compiler and Visual Studio
Hi all, Can somebody recommmend a good detailed guide for the procedures required to link ABAQUS 6.14 to Intel Fortran Compiler and Microsoft Visual Studio? Thank you, Hashmi
Supporting Organisations
Recent posts
-
HP clay subroutine in Plaxis 30.10.2020
-
Modeling cyclic undrained sandy soil triaxial test using ABAQUS 27.10.2020
-
UMAT for NorSand 27.10.2020
-
Problem with Hypoplastic Vumat use with CEL in Abaqus 27.10.2020
-
Interpreting results of sand hypoplastic model with Abaqus VUMAT 23.10.2020
-
Interpreting results of sand hypoplastic model with Abaqus VUMAT 22.10.2020
-
Skin friction along depth of pile 18.10.2020
-
SANISAND pile-soil-interaction ABAQUS 13.10.2020
-
Issues with Tochnog Professional not posting groundflow velocities 12.10.2020
-
Question on the Matlab driver-hypoplastic models 28.9.2020
-
a question on the clay hypoplasticity model with Abaqus umat 26.9.2020
-
UMAT Code for Modified Cam Clay model 22.9.2020
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