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 […]
Archive for category: Finite Elements
Fellin UMAT subroutine

Views 426
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 […]
Connecting remote sensors to the Plaxis FEM 3D using python

Views 4,804
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 […]
In Abaqus how do we use *DLOAD for defining both user-defined pressure and body force simultaneously?

Views 852
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.
Issue in applying SANISAND04 UMAT to Boundary-Value-Problem

Views 1,880
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 […]
ABAQUS UMAT of hypoplastic clay model

Views 1,100
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?
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 […]
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 […]
Problem in simulating CPT using SANISAND04

Views 6,643
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 […]
Example of FLAC3D data file

Views 2,921
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
sigini ans sdvini subroutine example for soil model in Abaqus

Views 1,585
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. […]
An error in the SANISAND umat runtime

Views 2,288
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 […]
set cavitation limit in ABAQUS/STANDARD when using SANISAND umat

Views 3,484
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 […]
Abaqus vs Plaxis – Local Convergence Tolerances

Views 5,464
Hi, I have a question regarding local, material-level convergence tolerances in FE software, particularly Abaqus and Plaxis. I have experience using Abaqus but not much familiar with Plaxis. As shown […]
Abaqus OneAPI Compiler

Views 8,147
Hello.. I am testing SaniSand constitutive model as published by Mr. Masin at this site. The Abaqus is V21 and the visual studio 2017 with OneAPI compiler, the Abaqus verification […]
Few more Question on calculating lateral displacement of pile using hypoplastic clay model

Views 4,215
Dear Professor David, Thank you very much for your previous clarification. its really helps. In continuation to my previous , there are few more question, i want your kindself to […]
Problem in calculating Lateral displacement of the pile using Hypoplastic clay model

Views 3,830
Hy Professor David, I am trying to verify the result of one of your paper by the title ‘Cyclic lateral response and failure mechanisms of semi-rigid pile in soft clay: […]
Special issue of Computers and Structures “Numerical simulation of multi‐physics phenomena in geotechnical structures”

Views 6,045
https://www.sciencedirect.com/journal/computers-and-structures/about/forthcoming-special-issues Numerical simulation of multi‐physics phenomena in geotechnical structures Complete and thorough analysis of geotechnical structures, requires various complex materials models with internal structures, which cannot be described by the […]
Hi, I’m facing a problem with my model. I’m trying to simulate a helical pile in soil. When I create the job, my job doesn’t make any increment and the […]
Using pore fluid-stress element in SandSand

Views 3,852
Hello everyone, Is it possible to use pore fluid- stress element in abaqus standard when soil is modeled using SANISAND constitutive model ? (UMAT)
Micropiles load tests database

Views 4,059
Hello, This Abou Alhaija Majd, Ph.D. student at Technical University of Civil Engineering Bucharest, i am looking for Micropiles load test data to be used for calibration in my study, […]
DIANA 10.5 new features

Views 4,515
DIANA 10.5 was released in 2021. It features many powerful capabilities to model soil-structure interection. See more in https://dianafea.com/2021-DIANA10-5-Release
UMAT code for Unsaturated soil modes

Views 4,566
Hello Everyone, I am trying to implement an unsaturated soil model (BBM or similar) in ABAQUS using UMAT. We want to assign a pore-pressure boundary condition for simulating the drying […]
Hi everyone, i want to carry out some transient dynamic analysis. as far as I know, dynamic steps in abaqus does not allow for pore pressure build-up and dissipation, and […]
Vibration foundation behavior

Views 4,998
Dear all I have FEM analysis results for vibration foundation response that rested either on saturated salt-encrusted flat soil (case-1) or on finite cemented sand overlie saturated salt-encrusted flat soil […]
Hypoplasticity sand convergence issues

Views 5,758
Hi everyone, i am modeling laterally loaded monopile using abaqus, My 3d model looks like this, only half of the model is simulated, symmetry boundary conditions is applied to the […]
Boundary Conditions of Masin 2005 Paper for clay hypoplasticity

Views 4,095
Hello, I am using clay hypoplastic umat code and trying to verify the code with the simulation on the paper of Prof. Masin. I found in the paper (Masin, 2005, […]
Seismic Liquifaction

Views 3,785
Hello All, I am trying to simulate the seismic liquefaction in Abaqus. Can you please help me to model this. Best Regards’ Saqib
Modelling cyclic loads in Tochnog

Views 3,574
Dears all, I am using Tochnog professional software to model undrained cyclic triaxial test for behaviour and liquefaction studies. Is there an incremental driver model to execute for compressional cyclic […]
Boundary value problems for granular materials subjected to earthquake loading

Views 3,622
Dear All, Hope you all well, I have been searching for some good publications on the Boundary value problems on Foundation system with granular materials subjected to earthquake loading or […]
UMAT Implementation in Abaqus (Hypoplastic clay Subroutines)

Views 4,400
Hi, I am working in Abaqus, aiming to model double porosity clay consolidation data by using hypoplastic clay model with meta stable structure. First, i just wanted to verify basic […]
Dear all, I am a Ph.D. student at Kharazmi University. Recently I have been trying to simulate a triaxial compression test using the hypoplasticity model for clay using ABAQUS. The […]
HP clay subroutine in Plaxis

Views 4,545
Dear Prof. Masin and Soil Model Community, I am using HP clay subroutine in Plaxis 3D to simulate soil structure interaction problem. I want void ratio and OCR variation along […]
Modeling cyclic undrained sandy soil triaxial test using ABAQUS

Views 4,342
Dear all, I am trying to use Abaqus to modeling undrained cyclic triaxial test for liquefiable soil. I am wondering how could I applied the cyclic load. I should apply […]
Problem with Hypoplastic Vumat use with CEL in Abaqus

Views 3,782
Hello all, I am currently working on the FE modeling of anchors installation into the soil using the CEL analysis in Abaqus. I tried to use the hypoplastic vumat for […]
Interpreting results of sand hypoplastic model with Abaqus VUMAT

Views 4,112
Dear concern, Recently i have modelled the soil pile interaction using Abaqus CEL method. The hypoplastic behavior of the soil is model using user subroutine VUMAT. The properties of the […]
Skin friction along depth of pile

Views 3,719
Dear all, I am simulating static pile load test in the rock by using ABAQUS. For comparison of numerical results with the experimental, I need skin friction vs depth plot. […]
Issues with Tochnog Professional not posting groundflow velocities

Views 3,615
I have been a =n user of the open source version of Tochnog for since 2004. I have been one of the maintainers and have contributed to the capabilities of […]
a question on the clay hypoplasticity model with Abaqus umat

Views 4,094
Dear all, I am a PhD student in Hohai University. Recently I have been trying to simulate a triaxial compression test using the hypoplasticity model for clay. The UMAT subroutine […]
ABAQUS-UMAT Help

Views 892
Hi everyone, I would like to ask if anyone has an example umat file for me to study to work on my master thesis researches. I would like to create […]
SANISAND umat issue

Views 4,410
Hello everyone; I have implemented the Sanisand constitutive model (UMAT) in abaqus in the scope of performing a dynamic analysis on a 3D soil-pile interaction problem. I have succeded in […]
Barodesy download package including small strain stiffness and strength reduction (UMAT and PLAXIS dll)

Views 3,726
A new download package for Clay Barodesy is available in the download section (https://soilmodels.com/barodesy/) The model uses the basic model of barodesy for clay (Medicus G. and Fellin W. 2017) […]
SANISAND 2008 model

Views 3,651
Dear fellow, Anyone have SANISAND 2008 by Taiebat and Dafalias umat subroutine available for Abaqus. I have 2004 but I need 2008 one.
PM4Silt software

Views 3,811
Hello everybody, Does somebody know a FEM Software with the implementation of PM4Silt model’s routine? I mean, one different from FLAC. Thanks for your help.
Factor of safety in Plaxis 3D using hypoplastic model for sand

Views 4,260
I am currently modelling a test conducted in the geotechnical centrifuge facility at HKUST. The test consisted of a sand slope with a rising water table. The slope height in […]
Slope stability calculation with hypoplasticity using phi-c reduction available now in download section

Views 4,185
The strength reduction method in clay hypoplasticity now available
ABAQUS modeling: Warning about unconnected regions when using hypoplasticity subroutine

Views 5,319
I ran a simple 3D model with symmetry boundary conditions first using elastic material and then as hypoplastic using a subroutine. However, in the former case, I don’t get the […]
Hi, I am doing Plane strain 2D simulation of GRPS embankment in ABAQUS, i encountered a problem that results of with geogrid and without geogrid both are showing same deflection. […]
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Recent posts
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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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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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