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 Prof. Masin. And I use the VUMAT_UMAT Interface from Prof. Bienen.
However, When I call the Vumat.for file, two errors always appears:
Error 1: The option *user material,type=mechanical completely defines the material behavior. It can not be used with an option that defines part of a material`s behavior
Error 2: A material property that is not allowed with a user material has been specified
PS: The picture shows the error message and the sand constitutive model parameters setting.
I did not find a solution to these two errors on the Internet, so I ask for help. Any suggestion or comment will be appreciated.
Errors of sand hypoplastic model with Abaqus Vumat
Related Articles
-
Looking for help
Axel Grauwinkel||Constitutive Modelling|4 |
Views 310
Hello guys. I just tried to calibrate on soilmodels. I´ve done three CIUP-REC-test plus one oedometric test. As you can see in the images, that there is still something quite […] -
multi yield surface model
kamal paknejad||Constitutive Modelling|6 |
Views 4,531
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 […] -
Abaqus user defined field
Van Doan||Constitutive Modelling|2 |
Views 4,194
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 […] -
MATLAB Code for Bounding Surface Plasticity Model
A S M RIYAD||Constitutive Modelling|0 |
Views 4,244
Dear Altruists, I just wanted to learn the bounding surface plasticity theory with coding. Does anyone have any code (written in MATLAB) for the Bounding Surface Plasticity model? Could you […] -
Sanisand
Norma Harb||Constitutive Modelling|1 |
Views 3,224
Hello, I am simulating soil and pile using Sanisand on Abaqus. I have problems with the analysis because of the value of the parameter 18. When I use small values, […] -
ExCalibre – Definiton of q
Manuel Winkler||Constitutive Modelling|3 |
Views 3,990
Hello, I am performing calibration trials for the hypoplastic sand model with the aid of ExCalibre and i was wondering how the deviatoric stresses q for the triaxial test input […] -
Hypoplastic model for Granular soil
Naveen Meena||Constitutive Modelling|5 |
Views 4,748
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. -
Problem with SANISAND UMAT
Safia EDAOUDI||Constitutive Modelling|3 |
Views 9,067
Hello all, I’m using the SANISAND UMAT I downloaded here for my research, the problem I found is it gives me wrong results in ABAQUS and INCREMENTAL DRIVER for element […]
Who is Online
No one is online right now
Search SoilModels Website
Recent posts
-
BCV bentonite experimental and modelling datasets 14.11.2023
-
Challenges in simulating geomechanical models using Mohr-Coulomb with Tension Cut-Off in Abaqus 20.10.2023
-
Analys soil liquefaction with Abaqus under blast load 19.10.2023
-
Hardening soil Model UMAT 13.9.2023
-
Problem with VUMAT interface 20.8.2023
-
UMAT and oneAPI compiler issues. (SOLVED…i hope :p) 5.8.2023
-
Oedometric Test Soil Test Plaxis 21.7.2023
-
Problem in simulating CPT using SANISAND04 10.7.2023
-
Problem with UMAT for clay hypoplasticity. Program exiting. 30.6.2023
-
Example of FLAC3D data file 10.6.2023
-
sigini ans sdvini subroutine example for soil model in Abaqus 6.6.2023
-
Presentations from Prague Geotechnical Days 2023 including 29th Prague Geotechical Lecture by Yannis Dafalias 25.5.2023
Recent Comments
- Johan Clausen on Challenges in simulating geomechanical models using Mohr-Coulomb with Tension Cut-Off in Abaqus
- Zhenyu Liu on Problem in using Hypoplastic model for sand in Abaqus.
- Dorsa Shadlou on SANISAND for FLAC3D Download
- Shuo Feng on Download Package of Matlab Driver
- Ajay Jatoliya on SANISAND for FLAC3D Download
- Isma Khabis on Hardening soil Model UMAT
- Anis Kheffache on Hardening soil Model UMAT
- Isma Khabis on Hardening Soil Model in Abaqus
- Fatemeh Safari on Matlab Driver
- KF JIAO on SANISAND Abaqus UMAT and Plaxis implementations
- Abdiel Ramon Leon Bal on Problem in simulating CPT using SANISAND04
- An Zhanng on Problem in simulating CPT using SANISAND04
- Giovanni Ciardi on UMAT and oneAPI compiler issues. (SOLVED…i hope :p)
- Anis Kheffache on UMAT and oneAPI compiler issues. (SOLVED…i hope :p)
- Giovanni Ciardi on UMAT and oneAPI compiler issues. (SOLVED…i hope :p)
- Anis Kheffache on UMAT and oneAPI compiler issues. (SOLVED…i hope :p)
- Giovanni Ciardi on UMAT and oneAPI compiler issues. (SOLVED…i hope :p)
- Anis Kheffache on UMAT and oneAPI compiler issues. (SOLVED…i hope :p)
Hi Kunpeng, can you explain why you define also elastic material behaviour? All the material behaviour should be governed by vumat.
Hi Prof. Masin, if I delete elastic material behaviour, another error will be generated:
ERROR in job messaging system: Error in connection to analysis
There is also a warning message:
A material defined in user subroutine VUMAT must be defined as purely elastic (using the initial elastic modulus) at the beginning of the analysis (stepTime=0). This is an informative message. It does not necessarily indicate that user subroutine VUMAT is incorrectly defined.
This is similar to the problem Panpan Guo encountered: https://soilmodels.com/general-questions-on-implementation-of-sand-hypoplasticity-model-with-abaqus-umat/
Hi Kunpeng, did you notice and activate this line in umat?
c For use in ABAQUS EXPLICIT, activate the following line
c if(kstep.eq.1 .AND. kinc.eq.1) testing=3
testing==3 means that elasticity is activated for the initialisation step
Hi Prof. Masin,
Yes, of course. This line is activated. But the problem still exists.
I see. This seems as a general problem of VUMAT usage, hope that someone using Abaqus explicit will be able to help.
Hi Prof.Masin,
Thank you for sharing the hypoplasty model.
I would like to know that if the model (clay Hypoplasty) includes the large deformations and plastic strains, and can you guide me on how to define and declare values to parameters of the model inside the Abaques application.
Appreciatively.
Hi, please study “Mašín, D. (2015) Part 4: Determination of material parameters, PhD course “Hypoplasticity for Practical Applications” handouts [Presentation]”, it is awailable for download in SoilModels publication database. Regards David
Thank you
Hi,
when using a umat or vumat, the following information needs to be included in the .inp file:
*Material, name=Material-xyz
*Depvar
integer_number,
*User Material, constants=integer_number
constants_definition
The information you included above reads *User material, type=mechanical. Please also check that the number of material constants defined here match that in the umat/vumat.
Hi,
I used VUMAT_UMAT interface from Dr. Bienen to transfer the Sanisand UMAT to VUMAT. I used the dynamic explicit step to do the analysis. I got the warning message like
“A material defined in user subroutine VUMAT must be defined as purely elastic (using the initial elastic modulus) at the beginning of the analysis (stepTime=0). This is an informative message. It does not necessarily indicate that user subroutine VUMAT is incorrectly defined.”
In Sanisand UMAT there has no these lines
c For use in ABAQUS EXPLICIT, activate the following line
c if(kstep.eq.1 .AND. kinc.eq.1) testing=3
testing==3 means that elasticity is activated for the initialisation step
The problem is not fixed by activating the following line:
c For use in PLAXIS, activate the following line
if(kstep.eq.1 .AND. kinc.eq.1) testing=1
c For use in ABAQUS, the line above should be inactive
Could you give me any suggestion?
Many thanks,
Shile
How i transfer the umat to vumat for the hypoplastic model, so i could used the Explicit solver?