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
-
Book “Modelling of soil behaviour on hypoplasticity” has been published
David Mašín||Constitutive Modelling|1 |Views 4,592
Hardcopies of my new book “Modelling of Soil Behaviour with Hypoplasticity – Another Approach to Soil Constitutive Modelling” just arrived. The book is available for hardcover or pdf orders at https://www.springer.com/us/book/9783030039752 -
Mohr Coulomb umat in Abaqus
Shuhan Cao||Constitutive Modelling|4 |Views 5,218
Dear all, does anyone have the umat code for Mohr Coulomb in Abaqus? For my current work I need a umat for Mohr Coulomb in Abaqus. It would be highly […] -
Hypoplasticity & Recent Stress History
Hashmi Sohawon||Constitutive Modelling|2 |Views 4,240
Hi David, Can you please provide some comments on the ability of the Hypoplasticity model with intergranular strain concept to model the effects of recent stress history on the clay […] -
General questions on implementation of sand hypoplasticity model with Abaqus umat
Panpan Guo||Constitutive Modelling|5 |Views 4,634
Dear all, I am a PhD student in Zhejiang University. Recently, I have been working on the simulation of a braced excavation with Abaqus. I want to simulate the soil […] -
General Questions Hypoplastic Umat on Abaqus
Hashmi Sohawon||Constitutive Modelling|11 |Views 4,464
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 […] -
Problem with VUMAT interface
Giada Orlando||Constitutive Modelling|3 |Views 3,405
Dear All, I am trying to run the VUMAT interface by Prof. Binen with the Sand Hypoplasticity. However, when I run the simulation Abaqus returns the following error: “Problem during […] -
ExCalibre Automatic Calibration
Marco Hofer||Constitutive Modelling|2 |Views 4,157
Hello all, i hava a problem with the Oedometer curves after the automatic calibration with ExCalibre. I took the Dobrany sand dataset for an automatic calibration and then i copied […] -
Question on the Matlab driver-hypoplastic models
c sx||Constitutive Modelling|5 |Views 3,972
Dear all, After carefully reading the matlab drivers of hypoplastic models, I was wondering why there is not mix control undrained TX compression. I want to achieve the same result […]
Search SoilModels Website
Recent posts
- Degradation ( disturbance ) of hypoplastic clay 23.4.2024
- Degradation ( disturbance ) of hypoplastic clay 23.4.2024
- Paper of Coulomb, C. A. (1773) 15.4.2024
- ABAQUS UMAT of hypoplastic clay model 6.4.2024
- Prague Geotechnical Days 2024 “Geotechnical monitoring” and 30th jubilee Prague Geotechnical Lecture by prof. Eduardo Alonso 5.4.2024
- UMAT for Creep-SCLAY model. 1.3.2024
- Cyclic tests with Triax element test driver 14.2.2024
- SUMMER SCHOOL ‘Numerical Modelling in Geotechnical Engineering’, Innsbruck – July 22nd-26th, 2024 1.2.2024
- COURSE IN SOIL MODELING – NTNU, Trondheim – October 14th to 18th, 2024 21.12.2023
- MSE walls design in Plaxis 11.12.2023
- sand liquefaction modelling in Anura3D 8.12.2023
- BCV bentonite experimental and modelling datasets 14.11.2023
Recent Comments
- Debdip Das on SANISAND Abaqus UMAT and Plaxis implementations
- Ramon Varghese on SANISAND for FLAC3D Download
- Akhtyar Gul Shirzoi on ABAQUS UMAT of hypoplastic clay model
- KHA DIDJA on Animating Soil Models
- Jh Xue on Undrained Tests with Clay Hypoplasticity Intergranular
- Zhentao Liu on Problem in simulating CPT using SANISAND04
- Gertraud Medicus on ABAQUS UMAT of hypoplastic clay model
- Chen Zhiming on Download Package of Charles University Implementation of High Cycle Accumulation Model
- Konstantinos Chatzis on Cyclic tests with Triax element test driver
- Abhay Pratap Singh on Cyclic tests with Triax element test driver
- Giovanni Ciardi on Cyclic tests with Triax element test driver
- Konstantinos Chatzis on Cyclic tests with Triax element test driver
- Ismail Khan on Cyclic tests with Triax element test driver
- Kanika Lamba on Cyclic tests with Triax element test driver
- Arie Koot on How to model the settlement in soil due to water drawdown.
- Konstantinos Chatzis on Cyclic tests with Triax element test driver
- Jose Duque on Cyclic tests with Triax element test driver
- MohamadReza Kamali on How to model the settlement in soil due to water drawdown.
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?