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.
Contains journal publication, associated umat for Abaqus and README.txt explaining model parameters and state variables.
change the friction angle with the plastic strain in Abaqus following mohr coulomb model.
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Hi, I want to change the friction angle with the plastic strain in Abaqus following mohr coulomb model. Vermeer and de Borst (1984) proposed an equation for frictional hardening and […]
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 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 model. Contains ABAQUS umat (source code), Plaxis UDSM (dll files only, not source code), package documentation, related journal publications, Abaqus and Plaxis examples.
Model to represent the behaviour of interfaces based on hypoplasticity. A general approach to model interfaces using continuum constitutive models is adopted.
SANISAND is an advanced elasto-plastic model based on a concept of rotational hardening incorporating the effects of fabric-dilatancy.
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 is an advanced incrementally non-linear constitutive model based on critical state soil mechanics developed specifically for simulation of fine-grained materials.
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 […]
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) user defined model standards by Bienen et al. (2014).
UMAT and Plaxis implementations of SANISAND constitutive model by Dafalias and Manzari (2004).
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.
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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Calibration Sand Hypoplasticity whit ExCalibre 2.11.2018
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New book “Modelling of Soil Behaviour of Hypoplasticity” 1.11.2018
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PhD position at Charles University in Prague: Modelling of THM Bentonite Behaviour for Nuclear Waste Repositories 1.11.2018
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PhD position at Charles University in Prague: Modelling of Slope Stability using Hypoplastic Model 1.11.2018
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multi yield surface model 28.10.2018
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