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 […]
Tag Archive for: abaqus
Hardening Soil or Hardening Soil-Small umat in Abaqus

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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 […]
Generalized Intergranular Strain Concept

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Implementation (umat.for) of a model published in Mugele, L., Stutz, H. H. and Mašín, D. (2024). Generalized intergranular strain concept and its application to hypoplastic models. Computers and Geotechnics 173, September 2024, 106480.
Intergranular Strain Extensions

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Various extensions of the original concept of intergranular strain (IS) according to Niemunis and Herle (1997), to account for small strain effects in constitutive models, have developed in recent years.
This page (which is currently under construction) is intended to provide an overview of existing intergranular strain extensions combined with corresponding implementations.
Abaqus Hypoplasticity Primary Variable Is Not Available

Views 2,171
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 […]
Soil model for sand under drained cyclic loading

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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.
ABAQUS UMAT of hypoplastic clay model

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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?
Challenges in simulating geomechanical models using Mohr-Coulomb with Tension Cut-Off in Abaqus

Views 2,296
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, […]
sigini ans sdvini subroutine example for soil model in Abaqus

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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. […]
Abaqus vs Plaxis – Local Convergence Tolerances

Views 5,557
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 […]
A High-Cycle Accumulation Model for Sand (Niemunis et al., 2005)

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A high-cycle explicit model for the accumulation of strain in sand due to small cyclic loading. The dependence of the accumulation rate on stress, void ratio, cyclic history and the type of loading is considered. In particular, the ovality and the polarization of the strain path during a cycle are taken into account.
Download Package of Charles University Implementation of High Cycle Accumulation Model

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Download package of Clay and Sand hypoplasticity UMAT and Plaxis implementations, including pre-compiled UMAT-Plaxis interface.
Kadlíček, T., Ochmański, M., Mašín, D. and Duque, J. (2022) Report on Charles University implementation of high cycle accumulation model

Views 348
Kadlíček, T., Ochmański, M., Mašín, D. and Duque, J. (2022) Report on Charles University implementation of high cycle accumulation model
Input files for element tests for hypoplastic clay/sand UMAT
Views 4,207
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 […]
Hardening Soil Model in Abaqus

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Is there Hardening Soil Model in Abaqus?
Interpreting results of sand hypoplastic model with Abaqus VUMAT

Views 5,240
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 […]
Interpreting results of sand hypoplastic model with Abaqus VUMAT

Views 4,156
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 […]
Mohr Coulomb umat in Abaqus

Views 8,961
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 […]
ABAQUS-UMAT Help

Views 895
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 4,499
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 […]
Abaqus user defined field

Views 5,086
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 […]
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 […]
Simulation code related to paper "Kadlíček, T. and Mašín, D. (2020). The strength reduction method in clay hypoplasticity. Computers and Geotechnics (in print)".
Non-local regularization: Need VUMAT of Mohr-Coulomb model in abaqus

Views 5,419
Dear Community, I want to include a non-local regularization technique in the built-in Mohr-Coulomb model of abaqus to capture the strain-localization effects. I am trying to find the original VUMAT […]
Dear all, I’m using the UMAT file in which the hypoplastic model for thermal cycles is implemented. In the Abaqus input file I have added the two lines necessary to […]
Download package of ISA cyclic hypoplasticity model. Contains umats and example Abaqus input files. Umats (ISA+sand hypoplasticity) allow to switch between ISA and classical intergranular strain concept.
Hypoplastic Model for Thermal Cycles (Ma et al., 2017)

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Model to simulate the cumulative feature of volumetric contraction of fine-grained soil subjected to thermal cycles. A thermal stabilization line is introduced to control the stabilized volumetric contraction under thermal cycles.
Automatic calibration software ExCalibre has been launched

Views 4,981
On behalf of the team of developers I am happy to announce that, after more than four years of development and testing, ExCalibre has just been launched. ExCalibre is a […]
A PhD-level course on hypoplastic constitutive modelling intended for both academia and practitioners.
Barodesy (Kolymbas, Medicus, Schneider-Muntau, Fellin)

Views 3,129
Barodesy is a constitutive model for granular media and does not use standard notations of elasto-plasticity, e.g. yield function, flow rule or plastic potential.
Download package of barodesy – ABAQUS umat (source code) and Plaxis dll

Views 2,074
Download package of barodesy model. Contains ABAQUS umat (source code), Plaxis UDSM (dll files only, not source code), package documentation, related journal publications, Abaqus and Plaxis examples.
Hypoplastic Interface Model (Stutz et al., 2016)

Views 2,786
Model to represent the behaviour of interfaces based on hypoplasticity. A general approach to model interfaces using continuum constitutive models is adopted.
SANISAND (Dafalias and Manzari, 2004)

Views 16,388
SANISAND is an advanced elasto-plastic model based on a concept of rotational hardening incorporating the effects of fabric-dilatancy.
Sand Hypoplasticity (von Wolffersdorff, 1996)

Views 11,312
Sand hypoplastic model is an advanced incrementally non-linear constitutive model for sand, an outcome of an extensive research at Karlsruhe University in 1990's.
Clay Hypoplasticity (Mašín, 2014)

Views 17,379
Clay hypoplasticity is an advanced incrementally non-linear constitutive model based on critical state soil mechanics developed specifically for simulation of fine-grained materials.
Presentations on hypoplasticity applications, D. Mašín, NGI 2017

Views 5,847
Based on some requests, I share here two presentations on hypoplasticity applications. One is related to simulation of various boundary value problems, the other focuses on simulation of cyclic and […]
UMAT Implementation of Sand Hypoplasticity by UIBK

Views 6,008
Download package contains two umats, one for basic hypoplasticity (von Wolffersdorff, 1996) and the other for hypoplasticity with small strain stiffness (Niemunis and Herle, 1997).
Interface between UMAT (Abaqus/Standard) and VUMAT (Abaqus/Explicit).

Views 7,345
Interface between umat (Abaqus/Standard) and vumat (Abaqus/Explicit) user defined model standards by Bienen et al. (2014).
SANISAND Abaqus UMAT and Plaxis implementations

Views 8,706
UMAT and Plaxis implementations of SANISAND constitutive model by Dafalias and Manzari (2004).
Download Package for Hypoplastic interface model and UMAT – FRIC interface

Views 1,769
Download Package of frictional interface model by Stutz et al. (2016, 2017) for granular soils based on Hypoplasticity including interface between UMAT and FRIC ABAQUS standards.
Clay and Sand hypoplasticity UMAT and Plaxis implementations, including UMAT-Plaxis interface

Views 18,229
Download package of Clay and Sand hypoplasticity UMAT and Plaxis implementations, including pre-compiled UMAT-Plaxis interface.
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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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