Hello all, I am trying to implement boundary surface plasticity using Bardets model in MATLAB. But i am obtaining negative values for q and Dep. Any help in this regard […]
Archive for category: Constitutive Modelling
SANISAND 2008 Model

Views 3,142
Hello Everyone, Can anyone have umat available for SANISAND 08 (Simple anisotropic sand plasticity model)?. Paper authored by Taiebat and Dafalias. They have used a closed type yield surface. Regards […]
Issues in getting the negative values of q (mean deviatoric stress) while simulating cyclic triaxial test in ABAQUS using SANISAND subroutine.

Views 3,417
Hello Everyone, I have been trying to simulate the cyclic triaxial test using the SANISAND04 subroutine. When I plotting the stress path (p-q plot), I am getting only the positive […]
UMAT for NorSand

Views 3,686
Dear all, I am pretty new in coding and using Abaqus. I have trouble with coding the UMAT for NorSand. If any of you have any good references, please share […]
Interpreting results of sand hypoplastic model with Abaqus VUMAT

Views 3,640
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 […]
SANISAND pile-soil-interaction ABAQUS

Views 3,658
Hi everyone: I am trying to use SANISAND as the constitutive model of soil, and use ABAQUS software to simulate pile-soil interaction. First step is “Geostatic”, the second step is […]
Dear all, After carefully reading the matlab drivers of hypoplastic models, I was wondering whether the driver can simulate triaxial extension tests. As I change the constraints to reflect triaxial […]
UMAT Code for Modified Cam Clay model

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I am trying to develop UMAT code for MCC, but facing difficulty. Is there any such files available which can help me to speed up. please refer. Thank you.
Mohr Coulomb umat in Abaqus

Views 4,105
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 […]
SANISAND pile-soil-interaction ABAQUS

Views 3,400
Hi everyone: I am trying to use SANISAND as the constitutive model of soil, and use ABAQUS software to simulate pile-soil interaction. Is it better to choose “Static, Genaral” analysis […]
Abaqus user defined field

Views 3,559
Hi, I am going to use the usdfld to function the density of sand changing due to confining pressure. I am not sure Abaqus will call the usdfld for every […]
Hardening parameters (yield stress & absolute plastic strain)

Views 4,429
Hi to everyone I want to model a Sand with Cap plasticity or Drucker Prager failure criterion in ABAQUS, and I have the result of Triaxial test (I’ve attached the […]
Errors of sand hypoplastic model with Abaqus Vumat

Views 4,020
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 […]
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 […]
Hypoplastic Interface Model: Does anybody implemented this model in FLAC3D

Views 3,269
I want to use this model to simulate soil-structure interaction in FLAC3D software, so I was wondering does anybody implemented this model in FLAC3D, and could you please share your […]
Question on implementation of sand hypoplastic model with Abaqus umat

Views 3,546
Dear all, I am a PhD student in China University of geosciences. Recently, I have been working on the simulation of a pile-soil interaction with Abaqus. I simulate the sand […]
General questions on implementation of sand hypoplasticity model with Abaqus umat

Views 3,717
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 […]
As a beginner to soil constitutive modelling, I am learning the hypoplastic models by reading the matlab drivers. I am confused with the matlab file f_hyp.m in the model hypo_sand. […]
Dear all, I am currently writing a proposal for a (small & hopefully nice) eLearning project: Within the project, I would like to create animations related to constitutive modelling. I […]
Hi all! I am modelling some triaxial compressions in ABAQUS with Weald Clay. The constitutive law i am using is the clay hypoplasticity by Mašín. When running the program using […]
SANICLAY-B (2018) how to calculate Dep
Views 3,402
Dear fellows, I have been working on coding SANICLAY-B model (2018) . Now I have one question in terms of this model. But I am stuck now. I have two […]
Calibration of the von Wolffersdorff model using Genetic Algorithms

Views 3,358
I am happy to announce that our pre-print paper, “Calibration of the von Wolffersdorff model using Genetic Algorithms”, is available on researchgate: https://www.researchgate.net/publication/342198062_Calibration_of_the_von_Wolffersdorff_model_using_Genetic_Algorithms. In this article, we propose a novel […]
Rate dependent plastic yield in Tochnog Question

Views 3,233
Hi, I am new to Tochnog and really appreciate the open source modeling chain (gmsh->Tochnog->paraview). So far, I’m only familiar with commercial codes, e.g. Abaqus. I actually deal with metal […]
need help in Flac3d6

Views 3,364
dear user hello i intend to build a numerical model using flac3d 6 software i build the geometry with extrusion pane and set all values for pile – soil interaction […]
SImulation with hypoplastic model for granular materials in ABAQUS

Views 3,500
Hello, I want to use the hypoplastic model for granular materials downloaded from https://soilmodels.com/download/plaxis-umat-hypoplas-zip. The UMAT file umat.for is the model for sand. I followed the instruction https://web.natur.cuni.cz/uhigug/masin/plaxumat/node5.html. I have […]
Cyclic Behavior of Sand

Views 3,155
Hello, Is there any constitutive model for sand which can simulate the number of cycles to reach the critical state. I used the SANISAND model but it is not promising. […]
Sanisand umat with BV problem

Views 3,115
Hi, Does someone know if sanisand implementation has been used in a boundary value problem for slope? do you have any references? Thanks very much!
Looking for help

Views 253
Hello guys. I just tried to calibrate on soilmodels. I´ve done three CIUP-REC-test plus one oedometric test. As you can see in the images, that there is still something quite […]
Hi all Just a short question on the modification of the intergranular strain concept proposed by Wegener & Herle (2014) to limit strain accumulation. In terms of the numerical implementation […]
How to implement this Hypoplastic Interface Model into ABAQUS combined with the existing hypoplastic model subroutine

Views 3,728
Hello: I’m a post-doc at the University of Nottingham, and I’m using the hypoplastic model to simulate the centrifuge tests we did. The research area is related to soil-pile interaction. […]
Implimentation of SANISAND constitutive model in ABAQUS/Standard for a soil-monopile interaction

Views 4,268
Dear all, I am trying to model soil-monopile interaction (3D) in ABAQUS/Standard in order to perform subsequently a cyclic and dynamic analysis. For the soil I am using the SANISAND […]
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 […]
Problems with the UMAT subroutine check_parms_DM of the SANISAND constitutive model

Views 3,532
Where can I find the source of the content in the picture below in the UMAT subroutine check_parms_DM of the SANISAND constitutive model?
3D analysis with Basic Hypo-Plastic Model

Views 3,202
Dear all Is the basic Hypo-Plastic model (Wollffersdorff’s model) suitable for 3D models? Can I analyze 3D models with this UMAT? (https://soilmodels.com/download/umat-hyposand-uibk/) Thank you Sobhan
Modified Cam clay model now supported in automatic calibration software ExCalibre

Views 3,892
Free SoilModels automatic calibration software ExCalibre, available at, https://soilmodels.com/excalibre/, now supports Modified Cam clay model. This is both for laboratory test simulation as well as for automatic calibration. We hope […]
Shear Stiffness Calculation for Hypoplastic Model

Views 3,367
Hi David, I have reproduced some single elements test on ABAQUS using the UMAT to compare with Triax Hypoplasticity. So far, my stiffness curve (q vs ea) and my stress […]
Hypoplastic UMAT error ABAQUS

Views 4,005
Hi all, I wanted to ask if anyone has experienced this error before when running the Hypoplastic UMAT (umat_hcea.for) on Abaqus? “Abaqus Error: The executable standard.exe aborted with system error […]
Sanisand model

Views 3,451
Is the Sanisand constitutive model 3 dimensional? Could it be used for dry sand cases using C4D8 elements? (drained sand) Is it possible to apply it in a dynamic implicit […]
Hi David, I am trying to reproduce some Triaxial data from Coop et al. (1995) using the Hypoplastic Model with Intergranular Strain Concept on Triax. So far, I cannot get […]
Hypo-sand UMAT problem

Views 3,444
Dear community I have 4 Question in implementation of Hypo-sand Umat in ABAQUS could someone kindly explain? 1. I checked the Umat file from (https://soilmodels.com/download/plaxis-umat-hypoplas-zip/) and i understand this subroutine […]
Hypoplastic rate independent and non-linearity

Views 3,182
Dear all I’m studying hypo-plastic constitutive law from beginning concepts I traced concepts successfully until i faced **rate independent topic** i read this topic in the prof. Wolfgangs paper (hypo-plasticity […]
Question on the Matlab driver – model hypo Cam Clay
Views 3,253
As a beginner to soil constitutive modelling, I am learning the hypoplastic models by reading the matlab drivers. I am confused with the matlab file f_hyp.m in the model hypo_camclay. […]
abaqus version

Views 3,226
hi every one i’m using abaqus 2017 and i want to implement Hypo-sand to my Biaxial model (2D) and before all, i linked abaqus and fortran successfully my question is […]
Sand Hypoplasticity calibration

Views 3,209
Good evening, everyone. I find it difficult to apply equations (13) and (14) of Herle’s publication “Determination of parameters of a hypoplastic constitutive model from properties of grain assemblies”. As […]
testing an User Defined Soil Model in plaxis

Views 3,804
Hi everyone I am writing a code for a model in the UDSM format for Plaxis. I already have the “*.dll” files, but when I run the soil test I […]
Undrained Tests with Clay Hypoplasticity Intergranular

Views 3,343
Hi all, I wanted to share these results to show that the use of the hypo clay model does in fact give more realistic undrained stress paths for clays on […]
Undrained Tests with Basic Clay Hypoplasticity

Views 3,549
Hi Prof. David, I have obtained these results in that attached picture using Triax and got confused when seeing that an isotopically normally consolidated sample does not follow a trend […]
VUMAT ABAQUS: sandy soil

Views 3,754
Dear PhD, I am studying roller vibrations on sandy soil models with vumat. Can PhD give me the subroutine model and input parameters of objects for reference? Unit of the […]
General Questions Hypoplastic Umat on Abaqus

Views 3,661
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 […]
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Recent posts
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FE formulation and software 25.3.2023
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Multi-objective analysis of the Sand Hypoplasticity model calibration 24.3.2023
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Problem with SANISAND UMAT 7.3.2023
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Prague Geotechnical Days 2023 (22nd – 23rd of May) with Prague Geotechnical Lecture by prof. Yannis Dafalias 28.2.2023
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What is an appropriate damping model for dynamic liquefaction analysis of tailings storage facility in FLAC? 10.2.2023
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Abaqus vs Plaxis – Local Convergence Tolerances 2.2.2023
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Zbraslav sand – Cyclic tests by Charles University 17.1.2023
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New features in Excalibre 17.1.2023
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Sanisand 13.1.2023
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SaniSand Model in Plaxis 3D 9.12.2022
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The GA-cal software for the automatic calibration of soil constitutive laws 2.12.2022
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Abaqus OneAPI Compiler 10.11.2022
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