Title
Tochnog Professional
Description
[Official Distributor Text]
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; stress, temperature and groundwater pressure analysis; lagrangian and eulerian mesh in space; quasi-static and dynamic calculations; a full libary of isoparametric elements in 1D, 2D and 3D and also featuring typical structural elements like beams, interfaces, springs, etc.; geometry based boundary conditions; mesh independent postprocessing by selecting physical points, lines and surfaces; 2D and 3D mesh refinement; phased modelling stages and extensive parallelisation. Tochnog accepts user defined models in ABAQUS UMAT format.
License & Website
Commercial, free trial available.
https://www.feat.nl
Available Constitutive Models
Clay hypoplasticity is an advanced incrementally non-linear constitutive model based on critical state soil mechanics developed specifically for simulation of fine-grained materials.
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.
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.
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).
[Other constitutive models, not present in SoilModels database]
Linear Elastic, Linear Elastic with Transverse Isotropy, Elastic Borja Tamagnini, Elastic Polynomial, Mohr-Coulomb, Cam-Clay, Cap elasticity, Di-Prisco Plasticity, Drucker-Prager, Cam-Clay for Bonded Soils, Hardening Soil, Multilaminate Plasticity, Viscoplasticity
Related Downloads
UMAT and Plaxis implementations of SANISAND constitutive model by Dafalias and Manzari (2004).
Download package of Clay and Sand hypoplasticity UMAT and Plaxis implementations, including pre-compiled UMAT-Plaxis interface.
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).
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.
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.
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 […]
The Tochnog Professional finite element program is now available as free version with 100 elements. It can be downloaded without registration from http://www.feat.nl. Several commercial and free pre- and postprocessors […]
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 […]
Calculation of coordinates of climbing formwork using hypoplasticity and pressuremter tests
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Our article published in the latest issue of Ground Engineering 10/2017. Great combination of cone-pressueremeter-testing (CPM) by FUGRO and advanced 3D Fem modelling by GEOLINK using hypoplastic constitutive equations to […]
