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 […]
Tag Archive for: abaqus
Hardening Soil Model in Abaqus

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1,419
Is there Hardening Soil Model in Abaqus?
Interpreting results of sand hypoplastic model with Abaqus VUMAT

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1,195
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

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967
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

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1,416
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

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451
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

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853
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

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1,098
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

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1,256
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 […]
ISA is a mathematical extension of conventional hypoplastic models for soils to improve simulations of cyclic loading. It can be considered as a reformulation of the conventional intergranular strain theory by Niemunis and Herle (1997).
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.
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

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1,277
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)

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1,852
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

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1,387
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)

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1,657
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)

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8,900
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)

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5,492
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)

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10,004
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

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2,431
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

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3,795
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).

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3,610
Interface between umat (Abaqus/Standard) and vumat (Abaqus/Explicit) user defined model standards by Bienen et al. (2014).
SANISAND Abaqus UMAT and Plaxis implementations

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3,588
UMAT and Plaxis implementations of SANISAND constitutive model by Dafalias and Manzari (2004).
Download Package for Hypoplastic interface model and UMAT – FRIC interface

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998
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

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9,494
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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Shear modulus degragation 12.5.2022
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FRIC code for clay hypoplasticity interface 23.4.2022
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Hypo-umat sand 18.4.2022
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Hypo-umat sand 18.4.2022
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Using pore fluid-stress element in SandSand 9.4.2022
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“Warning LNK4210” – hypoplastic clay UMAT 8.4.2022
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Prague Geotechnical Days 2022 with Prague Geotechnical Lecture by prof. Cino Viggiani 7.4.2022
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Micropiles load tests database 26.3.2022
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DIANA 10.5 new features 10.3.2022
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Input files for element tests for hypoplastic clay/sand UMAT 6.3.2022
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Combining Hypoplastic-sand and Hypoplastic-clay in one UMAT file 2.3.2022
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UMAT code for Unsaturated soil modes 19.2.2022
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