Constitutive Modelling Archives

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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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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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|1 |

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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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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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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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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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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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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Calibration of Hypoplastic material model parameters

Amine Aboufirass|2.2.2018|Constitutive Modelling|6 |

I would like to derive material parameters based for a simulation which will implement the hypoplastic material model based on the following information: • Heavily overconsolidated • Very dense, fine […]

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Hypoplastcity sand model

Pooja Patil|24.1.2018|Constitutive Modelling|7 |

Not able to run the subroutine ……..error is coming ……UMAT: illegal (negative) actual void ratio detected Can anybody help

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Subroutine of SANISAND model

Pooja Patil|10.1.2018|Constitutive Modelling|13 |

I am trying use sanisand subroutine posted in this website. But it is not working. Getting no values for field variable in the odb. I think i am missing something. […]