Forum Archives - SoilModels

Summer Intern Positions on Computational Modeling of Biomass Particle Flow

Wencheng Jin|14.3.2019|Position Announcements|0 |

We are currently seeking to hire summer interns in the area of geotechnical engineering, mechanical engineering with background in particle (soil) mechanics and computational continuum modeling at the Department of […]

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UMAT for hypoplastic subroutine

Naif Alsanabani|13.3.2019|Finite Elements|2 |

Hello all, Could you please anyone provide me umat for Hypoplastic model that used as subroutine in Abqus 6.14. With Best Regards Naif Mohammed

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EasyTochnog input file generator

Dennis Roddeman|6.3.2019|Finite Elements|0 |

Hi All, Tochnog Professional now has an EasyTochnog extension, see http://www.tochnogprofessional.nl/easy_tochnog/page.php. With simple input data like pile diameter, pile length, slope geometry, sheet pile data, etc. a complete Tochnog Professional […]

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DIANA FEA 10.3 new release – special on geotechnics

Ab van den bos|5.3.2019|Event Announcements|0 |

We are pleased to announce the release of DIANA 10.3, check out our Release Page to see all the new features, or to sign up for our webinar and/or course. […]

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Calibration problem

Abdulaziz Abdelkadr|5.3.2019|Constitutive Modelling|2 |

Dear Prof. David Mašín I am posting the queries I have emailed you as per your advice to post it here. During calibration for the basic hypoplasticity parameters using the […]

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Clay Hypoplastic Model ABAQUS UMAT

Hashmi Sohawon|1.3.2019|Constitutive Modelling|2 |

Hi, I wanted to ask if the variables/parameters defined in the online Hypoplastic model manual for PLAXIS (https://web.natur.cuni.cz/uhigug/masin/plaxumat/node6.html) are the same for the ABAQUS UMAT?

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PhD position is open at Charles University in Prague on Modelling of THM Bentonite Behaviour for Nuclear Waste Repositories.

David Mašín|27.2.2019|Position Announcements|0 |

PhD position is open at Charles University in Prague on Modelling of THM Bentonite Behaviour for Nuclear Waste Repositories. For more information, see https://www.stars-natur.cz/phd-positions/geology/hypoplastic-model-for-unsaturated-expansive-clays-used-in-simulations-of-bentonite-homogenization-for-nuclear-waste-repositories?back=7nlrl Deadline for application: March 19, 2019. […]

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Setting of Kw for Hypoplastic Clay UDSM in Plaxis

Joel Tan|25.2.2019|Constitutive Modelling|1 |

Prof. David Masin, I am posting the queries I have emailed you earlier which you have answered and therefore I am posting it here as per your request. I wish […]

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Datasets now available at SoilModels!

David Mašín|25.2.2019|SoilModels News|0 |

At the very interesting workshop on soil cyclic behaviour at NGI, Norway, February this year, we had a dsicussion on building a database of soil parameters for different constitutive models […]

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Book “Modelling of soil behaviour on hypoplasticity” has been published

David Mašín|5.2.2019|Constitutive Modelling|1 |

Hardcopies of my new book “Modelling of Soil Behaviour with Hypoplasticity – Another Approach to Soil Constitutive Modelling” just arrived. The book is available for hardcover or pdf orders at https://www.springer.com/us/book/9783030039752

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Tochnog Professional Page moves

Dennis Roddeman|25.1.2019|Finite Elements|1 |

Hi All, Starting from Saturday January 26 2019 the Tochnog Professional page moves to http://www.tochnogprofessional.nl Best, Dennis Roddeman

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Plaxis 3D Tunnel

Mesut Demir|21.1.2019|Finite Elements|0 |

Hi Everybody, I would like to ask an error problem where I am getting while using Plaxis 3D tunnel V 1.2. Previously I was using the software with Windows 7 […]

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Hypoplastic model for thermal cycles in clay (Abaqus)

Sherif Gomaa|20.12.2018|Finite Elements|2 |

Dear all, I’m using the UMAT file in which the hypoplastic model for thermal cycles is implemented. I have done some runs for an axisymmetrical model for a single energy […]

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Hypoplastic model for thermal cycles (Abaqus)

Chiara Iodice|13.12.2018|Finite Elements|2 |

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 […]

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Hypoplastic model for Granular soil

Naveen Meena|15.11.2018|Constitutive Modelling|5 |

Hello everyone, Could you please anyone tell me that how I can define the hypoplastic constitutive model for granular soil in ABAQUS 6.13. With Regards, Naveen.

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Calibration Sand Hypoplasticity whit ExCalibre

Francisco Mendez|2.11.2018|Constitutive Modelling|3 |

Dear all I have some laboratory test of Pescara sand and I’m trying to find the von Wolffersdorff parameters of this sand. So I have used ExCalibre with the data […]

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New book “Modelling of Soil Behaviour of Hypoplasticity”

David Mašín|1.11.2018|Constitutive Modelling|0 |

I have just returned to Springer proofs of my new book “Modelling of Soil Behaviour of Hypoplasticity – Another Approach to Soil Constitutive Modelling“. It will probably still take few […]

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multi yield surface model

kamal paknejad|28.10.2018|Constitutive Modelling|3 |

Hi everyone, i am trying to write umat subroutine for multi yield surface plasticity model.if its possible give me some information to do my project better and if some body […]

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ExCalibre – Definiton of q

Manuel Winkler|13.10.2018|Constitutive Modelling|3 |

Hello, I am performing calibration trials for the hypoplastic sand model with the aid of ExCalibre and i was wondering how the deviatoric stresses q for the triaxial test input […]

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ALERT Geomaterials – SoilModels support declaration

David Mašín|8.10.2018|Constitutive Modelling|0 |

ALERT Geomaterials (The Alliance of Laboratories in Europe for Education, Research and Technology) is a European organisation including 33 Universities or Organisations, which are most active in the field of numerical […]

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Constitutive Model for clayey sand Soils Considering the Effect of Intergranular Physicochemical Forces

Mehdi Ghatei|20.9.2018|Constitutive Modelling|0 |

Hi all, I’m doing some experimental work to investigate the salinity effect on clayey sand behaviour. Is there any constitutive model considering the physicochemical forces for such materials? Regards, Mehdi

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14th International Conference Underground Construction Prague 2019

David Mašín|14.9.2018|Event Announcements|0 |

The ITA-AITES Czech Tunnelling Association cordially invites you to 14th International Conference entitled “Underground Construction Prague 2019”, which will be held in Prague, the capital of the Czech Republic, June […]

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Difficulties in calibration of triaxial test on Hochstetten sand by sand Hypoplasticity model

AKSHAY SAKHARE|4.9.2018|Constitutive Modelling|2 |

“A hypoplastic relation for granular materials with a predefined limit state surface” paper by P. A. Von Wolffersdorff April 1996 include a triaxial test result of sample 10cm diameter and […]

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Interface to study soil-structure interaction in Plaxis 3D (Clay Hypoplasticity)

Leon Cortes|21.8.2018|Finite Elements|6 |

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 […]

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new hypoplasticity laws in Tochnog Professional

dennis roddeman|8.8.2018|Finite Elements|0 |

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 […]

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Website editing capability for SoilModels members!

David Mašín|6.8.2018|SoilModels News|0 |

Website editing capability for SoilModels members! SoilModels members can now edit website content associated with their accounts. While this change will be hardly noticeble to website visitors at the first […]

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Messaging system launched at SoilModels

David Mašín|13.7.2018|SoilModels News|0 |

Messaging system has just been launched at SoilModels, so that SoilModels Members cant contact each other without a need for the system to reveal email addresses (they are never revealed). […]

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Updated authorship of SoilModels database items

David Mašín|12.7.2018|SoilModels News|0 |

An authorship of SoilModels database items has been updated so that real contributors are now indicated as authors, not the SoilModels admin. This gives more credit to our contributors. We […]

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CEL analysis using hypo plasticity Vumat

abd Elfattah|12.7.2018|Constitutive Modelling|8 |

Greetings i used interface Vumat with Umat for simulating CEL problem, after 50% of analysis, i got the error as “Excessive incremental rotation of the elements in element set ” […]

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SoilModels Publication Database including Mohr (1900) paper defining Mohr-Coulomb model

David Mašín|11.7.2018|SoilModels News|0 |

Publication Database has just been launched at SoilModels. Its aim is to collect papers, theses or presentations associated with constitutive models available in Constitutive Model Database. These papers will also […]

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MatLab m.file

Ala Aljorany|10.7.2018|Constitutive Modelling|6 |

Hi everyone, I’m trying to simulate a triaxial test by using Matlab, adopting the sand hypoplasticity model with strain softening but so far couldn’t succeed. Would anyone help me with […]

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PM4Sand and PM4Silt models available

Katerina Ziotopoulou|5.7.2018|Constitutive Modelling|0 |

The constitutive models PM4Sand (Boulanger and Ziotopoulou 2017) and PM4Silt (Boulanger and Ziotopoulou 2018) for plane-strain earthquake engineering applications for sands, and clays and low-plasticity silts respectively are now available […]

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UMAT in Geotechnics

Majdi Flah|1.7.2018|Constitutive Modelling|2 |

Hi Everyone! I am a research Intern at Laval University, my project is about the effect of soil structure interaction on the seismic design of Geostructures. Exactly we want to […]

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Question about Interface between UMAT and VUMAT

Sina Niazi|8.6.2018|Constitutive Modelling|1 |

Hello, I read the research report and the FORTRAN code available at https://soilmodels.com/download/vumat_umatinterface-zip/. It sounds quite interesting but I have a couple of questions about the FORTRAN code: 1- Did […]

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PM4Sand now available in PLAXIS 2D

Micha van der Sloot|1.6.2018|Constitutive Modelling|0 |

With the release of PLAXIS 2D 2018, a new User Defined Soil Model for liquefaction analysis is introduced, the PM4Sand model (Boulanger & Ziotopoulou, 2017). The PM4Sand model is defined […]

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change the friction angle with the plastic strain in Abaqus following mohr coulomb model.

Majid Fetrati|18.5.2018|Finite Elements|1 |

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 […]

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Oedometer test simulation with “Sand Hypoplasticity Model” in Plaxis

Manuel Winkler|4.5.2018|Constitutive Modelling|2 |

Hi, I just came across some problems with the implementation of the “Sand Hypoplasticity Model” in Plaxis. I wanted to to perform a simulation of an oedometer test on a […]

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PM4SAND model

Mohammad Zarrabi|20.4.2018|Constitutive Modelling|3 |

Hi all, I have been trying to code the PM4SAND model for several months, but I faced some problems. I was wondering if there is anyone who worked with this […]

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SANISAND dll

Emilio Bilotta|18.4.2018|Finite Elements|2 |

Hi there, I’ve used successfully used SANISAND .dll with Plaxis 2016, but after switching to 2017 and now 2018 the .dll seems not to work (the parameter fields appear without […]

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Automatic calibration software ExCalibre has been launched

David Mašín|18.4.2018|Constitutive Modelling|0 |

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 […]

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Regarding FRIC : As a beginner

Arun C|13.4.2018|Constitutive Modelling|1 |

Sir, As a beginner of FRIC I am facing some difficulties to implement it. The downloaded FRIC code has been added to my pile soil friction model and trying to […]

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How to replicate results for vertical cut in FEM program

Amine Aboufirass|17.3.2018|Finite Elements|0 |

The equations for a vertical cut in cohesive material are given in several publications including Heyman (1973): The stability of a vertical cut (see attachment Equations1.jpeg) and Verruijt (2001) Soil […]

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Compile triax calibration software under windows

Hans Henning Stutz|14.3.2018|Constitutive Modelling|1 |

1. Download install exe (32 or 64 bit) from https://cygwin.com/install.html 2. Choose a mirror site / click Next and select all packages you need for compiling: Type: “gcc” into search […]

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Course “Hypoplasticity for Practical Applications”

David Mašín|13.3.2018|Event Announcements|3 |

A PhD-level course on hypoplastic constitutive modelling intended for both academia and practitioners.

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Hypoplastic Interface Model: Virtual Shear Zone Thickness and Surface Rougness Coefficient

Tunç Gökdemir|1.3.2018|Constitutive Modelling|2 |

Hello, I want to use Hypoplastic Interface (Fric Subroutine) in my ABAQUS contact models. However, I don’t know how I can determine Virtual Shear Zone Thickness. It is the Parameter […]

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Multilaminate model – new model at SoilModels

David Mašín|1.3.2018|SoilModels News|0 |

Multilaminate model (Schädlich, Schweiger and coworkers) is now available for download as Plaxis UsrMod. Thanks to Helmut Schweiger and coworkers from Graz University of Technology, Institute of Soil Mechanics, Foundation Engineering and Computational […]

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Hypoplasticity now available for GeoSlope SIGMA/W

David Mašín|1.3.2018|SoilModels News|0 |

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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Velacs Project Data

WaiChing Sun|28.2.2018|Constitutive Modelling|1 |

Dear colleagues, I want to ask your help — does anyone know where we can find all the test data from the old Velacs Project? If so, that would be […]

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Error: permission to access files denied (Hypoplasticity in PLAXIS)

Katharina Fechtner|27.2.2018|Constitutive Modelling|4 |

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 […]

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Triaxial Callibration test with Hypoplasticity

pooyan ghasemi|20.2.2018|Constitutive Modelling|3 |

Dear all I am trying to calibrate the HP for sand, and I have quite comprehensive data. but they are not totally consistent with each other . we have the […]

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