Hi all, I want to do degradation (perturbation) of subplastic clay with ABAQUS, but I can’t do it with umat, changing K,A,sf in ABAQUS has no effect on the result, […]
Archive for category: Constitutive Modelling
Hello everyone, I want to use ABAQUS to do the degradation of hypoplastic clay, but you can ‘t do it with umat. Changing K, A, sf in ABAQUS has no […]
Any one has a copy of Coulomb’s paper below, even better an English version? Thanks. Coulomb, C. A. (1773) Essai sur une application des régles de Maximis & Minimis à […]
UMAT for Creep-SCLAY model.
isma khabis||Constitutive Modelling|0 |
Views 1,332
Does anyone have the UMAT for the Creep-Clay model to be implemented in Abaqus?
Cyclic tests with Triax element test driver
Konstantinos Chatzis||Constitutive Modelling|8 |
Views 998
Dear all, I am attempting to utilize the triax driver for simulating cyclic triaxial tests. However, I have been unable to locate the command for conducting cyclic tests within the […]
MSE walls design in Plaxis
Leo Alibert||Constitutive Modelling|2 |
Views 636
Hi everyone, this is my first post in this forum. I am collecting initial data on the most appropriate soil model for the analysis of a multitiered MSE wall. I […]
Beginner level question for this forum – Trying to replace a Mohr-Coulomb model of sand in an Anura3D simulation with a material model which accurately describes sand liquefaction. References I’ve […]
Challenges in simulating geomechanical models using Mohr-Coulomb with Tension Cut-Off in Abaqus
Chee Min Leong||Constitutive Modelling|1 |
Views 1,695
I am modelling an underground cavern for Compressed Air Energy Storage applications using Abaqus. To begin, I attempted to replicate the results presented in the provided paper: Damasceno, DR, Spross, […]
Hardening soil Model UMAT
isma khabis||Constitutive Modelling|3 |
Views 4,392
I have the hardening soil model in the UMAT format. However, when I run the code, it gives me this error as shown in the picture. I tried to make […]
Problem with VUMAT interface
Giada Orlando||Constitutive Modelling|3 |
Views 3,394
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 […]
Oedometric Test Soil Test Plaxis
Ana Ribera||Constitutive Modelling|0 |
Views 2,341
Hi community, I am trying to simulate a oedometer test in soil test of plaxis but i am not reaching the expected results. In the Bentley manual available at the […]
Problem in using Hypoplastic model for sand in Abaqus.
isma khabis||Constitutive Modelling|16 |
Views 1,923
Hello, I am using the UMAT code for sand hypoplasticity provided by Prof. Masin — https://soilmodels.com/download/plaxis-umat-hypoplas-zip/. I am simulating Axisymmetric condition in Abaqus. To check the results given by the […]
Htypoplastic Model in Miidas GTS NX
Kassem Dib||Constitutive Modelling|6 |
Views 2,308
Hello.. I am defining the hypoplastic parameters for Karlsruhe sand (found in a paper) using MIDAS GTS NX. In the software the a requesting (in addition of parameters) the number […]
Multi-objective analysis of the Sand Hypoplasticity model calibration
Francisco Mendez||Constitutive Modelling|0 |
Views 934
I am happy to announce that our pre-print paper, “Multi-objective analysis of the Sand Hypoplasticity model calibration”, is available on researchgate (https://www.researchgate.net/publication/369199567_Multi-objective_analysis_of_the_Sand_Hypoplasticity_model_calibration) and Axive (https://doi.org/10.48550/arXiv.2303.07234). In this work, we study […]
Problem with SANISAND UMAT
Safia EDAOUDI||Constitutive Modelling|3 |
Views 9,252
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 […]
What is an appropriate damping model for dynamic liquefaction analysis of tailings storage facility in FLAC?
Paul le Roux||Constitutive Modelling|0 |
Views 7,438
Has anyone had success simulating earthquake loading / dynamic liquefaction in a full-scale, plane-strain model of a TSF in FLAC2D/FLAC3D? The topic of damping is complex and the choice of […]
New features in Excalibre
David Mašín||Constitutive Modelling|0 |
Views 7,251
Hi all, We are happy to announce that the Excalibre team received support from the research grant GACR 22-12178S to further develop the calibration software, which is freely available at […]
Sanisand
Norma Harb||Constitutive Modelling|1 |
Views 3,412
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, […]
SaniSand Model in Plaxis 3D
Kassem Dib||Constitutive Modelling|1 |
Views 16,980
Hello.. I am using SaniSand constitutive model, for the simulation of the behavior of onshore wind turbine using plaxis 3d. The dll file published in the website request the determination […]
The GA-cal software for the automatic calibration of soil constitutive laws
Francisco Mendez||Constitutive Modelling|2 |
Views 6,200
I am happy to announce that our pre-print paper, “The GA-cal software for the automatic calibration of soil constitutive laws: a tutorial and a user manual”, is available on researchgate […]
Hello, I am writting to ask how to get the elastic modulus or undrained strength of the soil in the simulation model by using hypoplastic model in clay? Is there […]
Hi altruists, Hope all of you are doing well. I am looking for literature on the NorSand model, which considers the drained cyclic triaxial testing behavior. I have found a […]
Shear modulus degragation
Baban Bapir||Constitutive Modelling|1 |
Views 4,625
Hello all, I am using the clay hypoplsticity model in Abaqus. As shown in the picture, I have to construct the stiffness desegregation curve to calibrate the R value. Can […]
FRIC code for clay hypoplasticity interface
Haran Gananathan||Constitutive Modelling|0 |
Views 4,777
Dear Prof Stutz and Prof Mašín, Is FRIC code for clay hypoplasticity available? If yes, could you please provide me with the link to download FRIC? Thank you Haran
“Warning LNK4210” – hypoplastic clay UMAT
Yu Xiao||Constitutive Modelling|1 |
Views 3,597
Hello Everyone, I am using the UMAT code for clay hypoplasticity provided by Prof. Masin — https://soilmodels.com/download/plaxis-umat-hypoplas-zip/ I made a test model in Abaqus2020 and applied the umat code (umat_hcea.for). […]
Input files for element tests for hypoplastic clay/sand UMAT
Juan Tello||Constitutive Modelling|0 |
Views 3,730
I’m interested in using the model for simulating excavations in clay, where the small strain modulus is important, and the analysis has to be transient consolidation. It would be helpful […]
Combining Hypoplastic-sand and Hypoplastic-clay in one UMAT file
anis kheffache||Constitutive Modelling|0 |
Views 3,780
Hi everyone, i have combined both Hypoplastic sand and clay umats in one umat ( to use for example in the case of multilayered soil medium made of clay and […]
I have a UMAT of Mohr Coulomb with no hardening, where i have to define SSE (specific strain energy) and SPD (specific plastic dissipation). Any idea?
Papers on Excalibre
David Mašín||Constitutive Modelling|0 |
Views 4,480
Hi all, Details of Excalibre software (https://soilmodels.com/excalibre) functionality and calibration procedure have been published in two papers, which are now available online at the webpages of publisher (https://link.springer.com/article/10.1007%2Fs11440-021-01441-0 and https://link.springer.com/article/10.1007%2Fs11440-021-01435-y). […]
Abaqus UEL Hypoplasticity
anis kheffache||Constitutive Modelling|0 |
Views 5,214
Dear all, I want to implement a new user element using the UEL subroutine. To simulate dynamic cases, one has to define the mass, damping and stiffness matrix then build […]
Hypoplastic UMAT & Void Ratio
Hashmi Sohawon||Constitutive Modelling|0 |
Views 5,626
Hi all, Can anyone give a clarification on the material property (parameter 22) in the hypopplasticity umat for clay on Abaqus. My understanding is that these parameters are defined as […]
Modelling TX monotonic compressive test with ABAQUS and SANISAND – not working
Riccardo Zabatta||Constitutive Modelling|9 |
Views 4,498
I am trying to reproduce a TX monotonic, compressive test on a sand by using a 1-element, axisymmetric ABAQUS FE model, assigned to a SANISAND material. For this purpose, I […]
Getting started with UMAT for Hypoplastic clay model in ABAQUS
Kanika Lamba||Constitutive Modelling|0 |
Views 4,360
Hello All, I am getting started with implementing UMAT for soil model in ABAQUS. I am planning to use Hypoplastic clay constitutive soil model to simulate the triaxial tests. I […]
consistent tangent stiffness calculation in hypoplasticity sand UMAT
Ran Tu||Constitutive Modelling|1 |
Views 4,587
Dear all, Thanks for hypoplasticity sand UMAT provided by Prof. Masin. During studying hypo sand UMAT, I am encountered with a question about consistent tangent stiffness calculation. subroutine ”perturbate_h“ seems […]
Dear forumers: Thanks to hypoplasticity sand UMAT provided by Prof. Masin — https://soilmodels.com/download/plaxis-umat-hypoplas-zip/. But during studying above sand UMAT, I found that the stress order may be incorrect. Because stress […]
ALERT doctoral school on constitutive modelling – hands on session triax input files
David Mašín||Constitutive Modelling|0 |
Views 4,331
ALERT doctoral school on constitutive modelling is happening right now. The school lecture notes are available at the website of ALERT geomaterials (http://alertgeomaterials.eu/publications/) Below you find triax input files for […]
Initial Stiffness of CU test in Masin’s 2014 Model
Shen Wang||Constitutive Modelling|1 |
Views 4,081
Hi, I am using Hypoplasticity model with explicit asymptotic boundary surface proposed by Prof. Masin in 2014. In this model, parameter ‘nu’ controls initial stiffness in CU test. But when […]
CONSTUTUTIVE MODELLING
MOHD SAQIB||Constitutive Modelling|0 |
Views 4,474
Can SANISAND version given in soil model work well for cyclic simple shear test ?
Hi Admin, I have been using hypoplastic subroutine supplied by this website. It works well in ABQ6.14 and ABQ2017. However, recently I have to upgrade to ABQ2021 due to an […]
MATLAB Code for Bounding Surface Plasticity Model
A S M RIYAD||Constitutive Modelling|0 |
Views 4,594
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 […]
Non convergence problem in abaqus using hpoeca Clay Hypoplasticity in slope model
Yang Xue||Constitutive Modelling|4 |
Views 4,004
hello everyone! based on the strength reduction method in clay hypoplasticity, firstly, I used two steps belong to the static_general, the first step is impose a gravity load, and not […]
Anyone has any reference to writing UMAT file for Poro linear elastic properties or what constitutive equations have to be solved to do the same. Any help would be appreciated […]
Cyclic/monotonic direct shear test (matlab driver)
anis kheffache||Constitutive Modelling|2 |
Views 5,494
Hi everyone, i am trying to simulate DSS/cDSS test in drained/undrained conditions and I was wondering how the constraints matrices should be ? while it is easy to understand how […]
Convergence issue of unload of clay consolidation in Abaqus
Shen Wang||Constitutive Modelling|5 |
Views 5,161
Hello, I was trying to simulate the unloading process of clay consolidation in Abaqus using clay hypoplasticity umat (https://soilmodels.com/download/plaxis-umat-hypoplas-zip/). But I had a convergence issue showing in Fig.1. The model […]
Convergence issue of unload of clay consolidation in Abaqus
Shen Wang||Constitutive Modelling|1 |
Views 4,015
Hello, I was trying to simulate the unloading process of clay consolidation in Abaqus using clay hypoplasticity umat (https://soilmodels.com/download/plaxis-umat-hypoplas-zip/). But I had a convergence issue showing in Fig.1. The model […]
PLAXIS 2D Embedded Pile Row
BENAN ZAHAWI||Constitutive Modelling|0 |
Views 4,694
PLAXIS 2D require a “Lateral Resistance ” for the embedded pile row. The manuals are not very clear as to what the resistance represents? Is it on friction ( similar […]
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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
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