I am trying use sanisand subroutine posted in this website.
But it is not working. Getting no values for field variable in the odb.
I think i am missing something. Can anybody help.
Related Articles
-
Hypoplastic model for Granular soil
Hello everyone, Could you please anyone tell me that how I can define the hypoplastic constitutive model for granular soil in ABAQUS 6.13. With Regards, Naveen. -
VUMAT ABAQUS: sandy soil
Dear PhD, I am studying roller vibrations on sandy soil models with vumat. Can PhD give me the subroutine model and input parameters of objects for reference? Unit of the […] -
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 […] -
Error: permission to access files denied (Hypoplasticity in PLAXIS)
Hello, I am trying to implement the dll for hypoplasticity in Plaxis 3D. It runs through both the Initial Phase and a Nil Step. However, when it calculates about 20 […] -
UMAT for strain-rate effects
Dear community, I’m interested in constitutive models that can handle strain-rate effects for HSR on sands for simulating free fall penetration. I would appreciate any help. Do you know any […] -
Compile triax calibration software under windows
1. Download install exe (32 or 64 bit) from https://cygwin.com/install.html 2. Choose a mirror site / click Next and select all packages you need for compiling: Type: “gcc” into search […] -
Hypoplastic Model inquire
Dear Prof. David Mašín Greetings I would like to discuss with you an issue. I have a problem in my simulation on ABAQUS. The problem in the simulation results is […] -
General Questions Hypoplastic Umat on Abaqus
Hi all, After successfully testing a linear elastic Umat on Abaqus, I am now trying to test the Hypoplastic model Umat. I intend to carry out a drained triaxial single […]
Who is Online
Supporting Organisations
Recent posts
-
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
-
Mohr Coulomb umat in Abaqus 21.9.2020
-
ABAQUS-UMAT Help 18.9.2020
-
SANISAND umat issue 18.9.2020
-
SANISAND pile-soil-interaction ABAQUS 10.9.2020
Dear Pooja, thanks for your comment. Please check the Download section. I have uploaded updated version of SANISAND umat, including Plaxis interface. Thanks to my colleagues from Zhejiang University for releasing the implementation.
Sir, Is this file also available for ABAQUS?
Sir,
is the sanisand umat is available for abaqus implementation?
Yes, umat is Abaqus format
i am able to download only the plaxis-umat sanisand model. Is the same can be use for abaqus?
Download package contains complete description what is inside:
https://soilmodels.com/download/plaxis-umat-sanisand/
Thankyu sir..i got mymod_sas.for…stvarlini.for….umat.for…usr_add.for and usrmod.for
Which one i should use
I am using it for a pile group model sir 🙂 thankyu somuch for ur time
Arun, as you will see if you open the package, there is directly the umat.for file, which is the Abaqus implementation. Note however that there is no detailed documentation of this package, it is provided on SoilModels on as-is basis for experienced users. If you need some more documented constitutive model implementation, you may also want to check sand hypoplasticity.
Thank you sir for your time ..i am working on it..surely i ll let u know the progress
I am using this model to simulate soil triaxial compression test by Abaqus (Axisymmetric model) but unfortunately it doesn’t give me the post peak softening results. I tried for Monotonic and cyclic loading and also with different soil model parameters but it is the same situation for post peak. Does it need any change in Umat code for softening or is there any solution (or suggestion) for this problem?
Hi Hossein, I contacted Yannis Dafalias, who contacted Majid Manzari and they have the following suggestion:
David
After I forwarded the site with the problem to Professor Manzari, I received the following response:
Professor Dafalias,
The student should use the parameters reported in the paper to simulate one of the drained triaxial compression tests shown in the paper. If he cannot get a stress-strain curve similar to what is shown in the paper, then the issue is with the numerical implementation of the model.
Thanks,
Majid
It is a good idea for the user to use first exactly the input from the paper to check if he can get the same response. The issue of softening is quite tricky if not handled correctly.
Best
yfd
Hello Hossein
If you write down the model input parameters you are using, the initial stress state and the maximum strain level you reach during your monotonic triaxial test I might be able to help you.
Dear David and Alexandros
Thank you for your replies, Fortunately I could calibrate the UMAT code parameters with my Triaxial Test experiment results in Abaqus and it works well now.
Best regards,
Hossein