Title
Clay Hypoplasticity (Mašín, 2014)
Description
Clay hypoplasticity is an advanced incrementally non-linear constitutive model proposed by Mašín (2014) based on critical state soil mechanics developed specifically for simulation of fine-grained materials. Its response has been validated using a number single and finite element simulations of various geotechnical problems, both onshore and offshore. When combined with so-called intergranular strain concept (Niemunis and Herle, 1997), it is capable of predicting small strain stiffness degradation and cyclic loading effects.
References
Mašín, D. (2013) Clay hypoplasticity with explicitly defined asymptotic states. Acta Geotechnica 8(5): 481-496 [Preprint] 2.52 MB
Mašín, D. (2014) Clay hypoplasticity model including stiffness anisotropy. Géotechnique 64(3): 232-238 [Preprint] 1.05 MB
Mašín, D. (2015) Part 4: Determination of material parameters, PhD course "Hypoplasticity for Practical Applications" handouts [Presentation] 5.13 MB
Mašín, D. (2017) Presentation on applications of hypoplasticity, various case studies, Presentation delivered at Norwegian Geotechnical Institute [Presentation] 27.59 MB
Mašín, D. (2017) Presentation on hypoplasticity modelling of cyclic and static response of offshore foundations, Presentation delivered at Norwegian Geotechnical Institute [Presentation] 24.47 MB
Mašín, D. (2018) Clay Hypoplasticity - Actualised Equation Summary [Report] 183.21 KB
Niemunis, A. and Herle I. (1997) Hypoplastic model for cohesionless soils with elastic strain range. Mechanics of Cohesive-Frictional Materials 2: 279–299 [Preprint] 416.76 KB
Simulation Software Offering This Model
The Abaqus Unified FEA product suite offers powerful and complete solutions for both routine and sophisticated engineering problems covering a vast spectrum of industrial applications.
PLAXIS 2D and 3D are powerful and user friendly finite element package intended for two-dimensional and three-dimensional analyses of deformation and stability in geotechnical engineering and rock mechanics.
SIGMA/W is a powerful finite element software product for modeling stress and deformation in earth and structural materials. SIGMA/W analyses may range from simple linear elastic simulations to soil-structure interaction problems with nonlinear material models.
Tochnog Professional is a Finite Element program offering a wide variety of geotechnical and mechanical options; modern material laws including the most recent rate independent and viscous hypoplasticity models.
This program, based on the finite element method, can model and analyze a wide range of geotechnical problems, including terrain settlement, sheet pile/diaphragm walls, slope stability, excavation analysis.
Calibration Software Offering This Model
ExCalibre is online tool for automatic calibration of soil constitutive models, adopting a unique model-specific calibration algorithm respecting physical meaning of material parameters. Experimental data are read from a simple Excel spreadhseet template.
Triax is an inhouse element test constitutive model driver developed since 2001 at Charles University and elsewhere by David Mašín and coworkers. It covers wide range of constitutive models and testing conditions.
Incremental Driver is a single element code developed by Andrzej Niemunis (2007, 2014) for running element tests using constitutive models implemented in umat format.
The SoilTest option is a quick and convenient procedure to simulate basic soil lab tests. It also offers the possibility to optimise model parameters. It works for any model, both standard soil models as well as user-defined models.
Simple Matlab driver running elasto-plastic and hypoplastic models. Rather an education tool than a serious calibration software, but some may find it useful to familiarize with the structure of constitutive model equations and to run simple element test simulations.
A dedicated special purpose incremental driver which is able to calculate the results of homogeneous experiments. Both displacement controlled and force controlled experiments can be performed.
Related Downloads
Download package of Clay and Sand hypoplasticity UMAT and Plaxis implementations, including pre-compiled UMAT-Plaxis interface.
Simple Matlab element test driver running elasto-plastic and hypoplastic models. Programmed in 2012 by Claudio Tamagnini and David Mašín for the ALERT Olek Zienkiewicz Course.
Download package of sand and clay hypoplasticity for GeoSlope SIGMA/W finite element code. Based on umat, comes along with the source code.
Image Gallery
Related SoilModels Forum Posts
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 […]
A PhD-level course on hypoplastic constitutive modelling intended for both academia and practitioners.
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 […]
Hello, I am trying to implement the dll for hypoplasticity in Plaxis 3D. It runs through both the Initial Phase and a Nil Step. However, when it calculates about 20 […]
Interface to study soil-structure interaction in Plaxis 3D (Clay Hypoplasticity)
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Hello, I am trying to simulate the behavior of helical anchors (also called screw anchors) using PLAXIS 3D and a clay hypoplasticity constitutive model. The helical anchor shaft is simulated […]
The 2014 Masin hypoplasticity for clays has been implemented in Tochnog Professional under guidance of Dr. David Masin. This implementation includes structure, intergranular strains and visco effects. Extensions to the […]
Hypoplasticity (sand and clay models) is now available for GeoSlope SIGMA/W finite element code in a form of user defined Add-In. The implementation is based on ABAQUS umats and it […]
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