Hello everyone, I am using the ‘remeshing and interpolation technique with small strain’ (RITSS) method with hypoplastic, but I cannot continue the calculation after mapping. There is a warning in […]
Request for VUMAT Implementation of Mohr-Coulomb, Drucker-Prager, or Drucker-Prager Cap
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I’m looking for a VUMAT subroutine for Mohr-Coulomb, Drucker-Prager, or Drucker-Prager Cap models in Abaqus/Explicit. If anyone has a working implementation that they’re willing to share, I’d greatly appreciate it! […]
Suggestions for an Advanced Constitutive Model in FEM-Based Dynamic Slope Stability Analysis
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Dear colleagues, I am planning to conduct a dynamic stability analysis of a slope using the finite element method (FEM). I intend to implement the analysis through coding and utilize […]
Dear all, does anyone have the umat code for Hardening Soil or Hardening Soil-Small in Abaqus? For my current work I need a umat for Hardening Soil or Hardening Soil-Small […]
I want to consider particle crushing in the hypoplastic interface model. Also, when I use the CEL method to simulate, how can I use the hypoplastic interface model? Should I […]
I cannot find sanisand in the library of available constitutive models for the triaxial test driver, even if it is listed as one of the available models on the main […]
REQUEST FOR EXPRESSIONS OF INTEREST (REOI) FOR PROJECT IN CONSTITUTIVE MODELLING
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Red Earth Engineering (REE) seeks expertise in computational mechanics and constitutive modelling in geotechnical engineering to undertake a consultancy project. The project aims to develop Python codes to solve the […]
Hello, I am using the UMAT code hypoplasticity provided by Prof. Masin — https://soilmodels.com/download/plaxis-umat-hypoplas-zip/. I am simulating a very small and very basic analysis in Abaqus. I made basic cubic […]
Hi folks, May I know Is there a useable VUMAT in soilmodels.com that follows the framework of Grabe and Hamann? I need the VUMAT to calculate excess pore pressure in […]
Dear all, I require to use Drucker Prager Cap Hardening Model in ABAQUS for which I need to write a subroutine. Kindly let me know if you can help, thank […]
Hello all, I”m trying to simulate an axial cyclic loading in a drained soil using soil models like ISA hypoplasticity and SANISAND but for borh models the accumulated strain is […]
Hello, everyone. I have encountered an issue during the simulation of triaxial compression of rocks using the perfectly elasto-plastic Mohr-Coulomb model in Abaqus. In my simulation, the stress-strain curve consists […]
The Mises stress calculated by the hypoplasticity model considering the intergranular strain is all 0
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Hi all, Recently I am simulating unit tests in tight sand under pressure using a subplastic model, the sand is Fontainebleau sand and the subplastic model is from David Mašín.This […]
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, […]
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 […]
Does anyone have the UMAT for the Creep-Clay model to be implemented in Abaqus?
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 […]
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
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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, […]
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 […]
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 […]
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 […]
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 […]
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 […]
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 […]
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?
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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 […]
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 […]
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, […]
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
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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 […]
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 […]
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
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). […]
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 […]
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?
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). […]
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 […]
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
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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 […]
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 […]
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Recent posts
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Abaqus RITSS methon for LDFE analysis with hypoplastic 17.3.2025
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Request for VUMAT Implementation of Mohr-Coulomb, Drucker-Prager, or Drucker-Prager Cap 28.2.2025
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Suggestions for an Advanced Constitutive Model in FEM-Based Dynamic Slope Stability Analysis 12.2.2025
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Hardening Soil or Hardening Soil-Small umat in Abaqus 2.1.2025
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hypoplastic interface 11.12.2024
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Triaxial Test Driver SANISAND 30.10.2024
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REQUEST FOR EXPRESSIONS OF INTEREST (REOI) FOR PROJECT IN CONSTITUTIVE MODELLING 23.10.2024
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Programme of the ALERT Olek Zienkiewicz school on Constitutive Modelling of Geomaterials, February 3 to 7, 2025, Prague, Czech Republic 11.10.2024
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Connecting remote sensors to the Plaxis FEM 3D using python 26.7.2024
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Intergranular Strain Extensions 16.7.2024
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Abaqus Hypoplasticity Primary Variable Is Not Available 1.7.2024
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Vumat to calculate excess pore in Coupled Eulerian-Lagrangian ABAQUS 1.7.2024
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