Registration is now open for the Prague Geotechnical Days 2026, scheduled for May 4–5, 2026, in Prague. This year’s theme is ‘Geotechnical Failures.’ Distinguished lecturers will cover a broad range […]
📢 𝗣𝗼𝘀𝗶𝘁𝗶𝗼𝗻 𝗮𝘃𝗮𝗶𝗹𝗮𝗯𝗹𝗲: 𝗥𝗲𝘀𝗲𝗮𝗿𝗰𝗵 𝗙𝗲𝗹𝗹𝗼𝘄 (𝗚𝗲𝗼𝘁𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴) The Centre for Offshore Foundation Systems (COFS) at The University of Western Australia are recruiting for a new Research Fellow to support their […]
Hello, dear teachers and friends. I would like to ask the following questions：1.How to set parameter 17(Kw) in the hypoplasticity clay model about abaqus? 2.In addition, during the restart analysis […]
At present, I am trying to realize Drucker-Prager Cap model by using vusdfld and usdfld of abaqus. If anyone is willing to share their work, I would be grateful!
Hello, I am trying to learn ‘Numerical modelling of the effects of consolidation on jack-up spudcan penetration.’ I would like to ask, when using the RITSS method, which variables in […]
After downloading the umat_vec.f related files (and the spw_hy.inp (publishe by Fellin at all) I got runtime problems in Abaqus 2020 during the first step. The error message in the […]
While performing drained triaxial compression tests on hypoplastic clay using ABAQUS, I observed that the specimen’s porosity remains constant. Additionally, I have questions regarding the application of the material parameter […]
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 […]
Programme of the ALERT Olek Zienkiewicz school on Constitutive Modelling of Geomaterials, February 3 to 7, 2025, Prague, Czech Republic
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PROGRAMME OF THE ALERT OLEK ZIENKIEWICZ SCHOOL ON CONSTITUTIVE MODELLING OF GEOMATERIALS 2025 DATES: February 3 to February 7, 2025 VENUE: Charles University, Prague, Czech Republic ADDRESS: Albertov 6, […]
Dear I want to connect remote sensors to my engineering software Plaxis FEM 3D. Some days ago I was able to connect the python to the Plaxis FEM 3D, but […]
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 […]
In Abaqus how do we use *DLOAD for defining both user-defined pressure and body force simultaneously?
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In Abaqus how do we use *DLOAD for defining user-defined pressure and body force simultaneously? I want to user-define both body fore and pressure.
Hi All, I am currently working on a research problem involving the implementation of the SANISAND04 UMAT (Soil models) in Abaqus for embankment analysis. While I have successfully tested the […]
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 […]
Hi Everyone. I am new to this Platform. I want to use the hypoplastic model in my research. how I can download it UMAT file for ABAQUS software?
Prague Geotechnical Days 2024 “Geotechnical monitoring” and 30th jubilee Prague Geotechnical Lecture by prof. Eduardo Alonso
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The 30th Prague Geotechnical Days international conference focused on Geotechnical Monitoring, including 30th Prague geotechnical Lecture by prof. Eduardo Alonso, will be held on May 13–14, 2024 Registration: free for […]
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
||Constitutive Modelling|1 |
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, […]
Dear all, I need to use ABAQUS to analyze the liquefaction of saturated soil under explosive load. How should I simulate this process? Currently I need the pore water pressure […]
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 […]
Dear all, A while ago, a person asked about the hypoplasticity umats, the problem was that the umats were not working when compiled using the oneAPI fortran compiler, an error […]
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 […]
I have a question regarding the simulation of cone penetration tests using the SANISAND04 model. I have observed that the parameter m (yield surface size）has a significant impact on the […]
Hello.. I am new in FLAC3D, could some send to me an example of data file code for pile soil interaction with seismic loads ? I will be thankful
Dear all, I’m looking for a sigini and sdvini subroutine examples to calculate soil initial state with rest coeficient K0 method or ICP-05 method or any method available. thank you. […]
Presentations from Prague Geotechnical Days 2023 including 29th Prague Geotechical Lecture by Yannis Dafalias
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Hi all, Prague Geotechnical Days 2023 were indeed a successfull event. We are happy to let you know that selected presentations are now awailable in SoilModels publication database. In particular, […]
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 […]
Dear all I was simulating a pile in a fully drained soil subjected to horizontal loads using ABAQUS (as shown in Figure 1) and noticed from the monitor that 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 […]
Dear all I am recently working on the mechanical characteristics of large diameter monopiles under horizontal loads.The numerical simulation part of this project was carried out in ABAQUS/STANDARD and for […]
Supporting Organisations
Recent posts
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Prague Geotechnical Days 2026 3.2.2026
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Postdoctoral position at COFS, UWA 28.7.2025
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Hypoplasticity clay in ABAQUS 23.7.2025
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Drucker-Prager Cap 29.5.2025
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Abaqus RITSS with hypoplastic 9.4.2025
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Fellin UMAT subroutine 2.4.2025
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Hypoplasticity clay for triaxial compression in abaqus 26.3.2025
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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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