Hi all, I wanted to ask if anyone has experienced this error before when running the Hypoplastic UMAT (umat_hcea.for) on Abaqus? “Abaqus Error: The executable standard.exe aborted with system error […]
Archive for category: Constitutive Modelling
Sanisand model
sahar saab||Constitutive Modelling|1 |
Views 4,231
Is the Sanisand constitutive model 3 dimensional? Could it be used for dry sand cases using C4D8 elements? (drained sand) Is it possible to apply it in a dynamic implicit […]
Hi David, I am trying to reproduce some Triaxial data from Coop et al. (1995) using the Hypoplastic Model with Intergranular Strain Concept on Triax. So far, I cannot get […]
Hypo-sand UMAT problem
sobhan abedinnejad||Constitutive Modelling|2 |
Views 4,207
Dear community I have 4 Question in implementation of Hypo-sand Umat in ABAQUS could someone kindly explain? 1. I checked the Umat file from (https://soilmodels.com/download/plaxis-umat-hypoplas-zip/) and i understand this subroutine […]
Hypoplastic rate independent and non-linearity
sobhan abedinnejad||Constitutive Modelling|2 |
Views 3,929
Dear all I’m studying hypo-plastic constitutive law from beginning concepts I traced concepts successfully until i faced **rate independent topic** i read this topic in the prof. Wolfgangs paper (hypo-plasticity […]
Question on the Matlab driver – model hypo Cam Clay
Hengyi Kang||Constitutive Modelling|2 |
Views 4,006
As a beginner to soil constitutive modelling, I am learning the hypoplastic models by reading the matlab drivers. I am confused with the matlab file f_hyp.m in the model hypo_camclay. […]
abaqus version
sobhan abedinnejad||Constitutive Modelling|3 |
Views 3,983
hi every one i’m using abaqus 2017 and i want to implement Hypo-sand to my Biaxial model (2D) and before all, i linked abaqus and fortran successfully my question is […]
Sand Hypoplasticity calibration
Francisco Mendez||Constitutive Modelling|1 |
Views 3,971
Good evening, everyone. I find it difficult to apply equations (13) and (14) of Herle’s publication “Determination of parameters of a hypoplastic constitutive model from properties of grain assemblies”. As […]
testing an User Defined Soil Model in plaxis
MIGUEL VALENCIA GALINDO||Constitutive Modelling|2 |
Views 4,796
Hi everyone I am writing a code for a model in the UDSM format for Plaxis. I already have the “*.dll” files, but when I run the soil test I […]
Undrained Tests with Clay Hypoplasticity Intergranular
Hashmi Sohawon||Constitutive Modelling|1 |
Views 4,140
Hi all, I wanted to share these results to show that the use of the hypo clay model does in fact give more realistic undrained stress paths for clays on […]
Undrained Tests with Basic Clay Hypoplasticity
Hashmi Sohawon||Constitutive Modelling|6 |
Views 4,335
Hi Prof. David, I have obtained these results in that attached picture using Triax and got confused when seeing that an isotopically normally consolidated sample does not follow a trend […]
VUMAT ABAQUS: sandy soil
hoang thai an||Constitutive Modelling|2 |
Views 4,595
Dear PhD, I am studying roller vibrations on sandy soil models with vumat. Can PhD give me the subroutine model and input parameters of objects for reference? Unit of the […]
General Questions Hypoplastic Umat on Abaqus
Hashmi Sohawon||Constitutive Modelling|11 |
Views 4,440
Hi all, After successfully testing a linear elastic Umat on Abaqus, I am now trying to test the Hypoplastic model Umat. I intend to carry out a drained triaxial single […]
Non-local regularization: Need VUMAT of Mohr-Coulomb model in abaqus
Kunal Sanjay Pardikar||Constitutive Modelling|1 |
Views 4,576
Dear Community, I want to include a non-local regularization technique in the built-in Mohr-Coulomb model of abaqus to capture the strain-localization effects. I am trying to find the original VUMAT […]
Error in abaqus when use sanisand
mj saffarian||Constitutive Modelling|5 |
Views 4,471
Hi everyone When I use sanisand model in abaqus , This error is seen Can anyone help? Other subroutines work well for me Is it possible for my input parameters […]
hypoplasticity umat filr
sobhan abedinnejad||Constitutive Modelling|2 |
Views 4,089
hello every one i have a problem with abaqus subroutine can i use hypoplastic umat file that prepared for palxis in this website in abaqus? or the files must be […]
Spurious oscillations in calculated accelerations
Piotr Kowalczyk||Constitutive Modelling|2 |
Views 4,132
Hello everyone, I have just a general question how people approach the problem of spurious oscillations generated in dynamic analysis when using nonlinear soil constitutive models. I understand sometimes numerical […]
Difference between ExCalibre and Plaxis for Oedometer test
Marco Hofer||Constitutive Modelling|3 |
Views 4,193
Hello all, i did the automatic calibration for the Dobrany and Motol sand and tried to model the soil tests also in Plaxis and then to compare both. For the […]
Dear community, I’m interested in constitutive models that can handle strain-rate effects for HSR on sands for simulating free fall penetration. I would appreciate any help. Do you know any […]
Hypoplastic Model for Clays (Masin): Ag, ng or Gvh, n
Fernando Sarabia||Constitutive Modelling|1 |
Views 5,099
Dr. Masin I have downloaded the most recent dll for Plaxis that includes the HypoPlastic model for Clays that you developed. I see two new parameters (Gvh0 and n), both […]
Cyclic constitutive model for cemented granular soils
Hamoun Alimoradi||Constitutive Modelling|2 |
Views 4,125
if you could please let me know whether Is there any constitutive model exist for capturing cyclic response for cemented materials just like cemented sand and gravelly soils.
lade umat file
sobhan abedinnejad||Constitutive Modelling|0 |
Views 4,185
Hi everyone, I work on soil constitutive models and I want to compare soil behaviours with various constitutive models but I can’t find Lade umat in the .for format. Can […]
ExCalibre Automatic Calibration
Marco Hofer||Constitutive Modelling|5 |
Views 4,143
Hello all, i have another question regarding the calibration process. Why do the initial void ratios differ between the input file and the output from excalibre? What is done during […]
Cyclic simple shear test simulation with hypoplasticity
Piotr Kowalczyk||Constitutive Modelling|2 |
Views 4,662
Dear All, I am using sand hypoplastic model in my research and I have encountered some problem when looking into cyclic simple shear test in the range of small strains. […]
Hypoplastic Model inquire
Mahmoud Hamed||Constitutive Modelling|3 |
Views 4,134
Dear Prof. David Mašín Greetings I would like to discuss with you an issue. I have a problem in my simulation on ABAQUS. The problem in the simulation results is […]
ExCalibre Automatic Calibration
Marco Hofer||Constitutive Modelling|4 |
Views 4,036
Hello all, According to my last post some weeks ago I now have translated the laboratory data from engineering strain to true strain with the following formula: epsilon(true)=ln(1+epsilon(engineering)). I compared […]
Greeting Everyone, I’m a new user of ABAQUS. I’m trying to simulate soil dynamic compaction by Cap model. I simulated the blow by half sinusoidal wave. Although I used Cap […]
Calibration the UMAT sand hypoplastic parameters
aysar hassan||Constitutive Modelling|3 |
Views 4,015
Dear all, I’m facing trouble in calculating NO. 16 parameter in the UMAT for sand hypoplasticity by Dr. Masin, any help will be really appreciated especially with an example. Best […]
ABAQUS Linking With Fortran Compiler and Visual Studio
Hashmi Sohawon||Constitutive Modelling|4 |
Views 11,590
Hi all, Can somebody recommmend a good detailed guide for the procedures required to link ABAQUS 6.14 to Intel Fortran Compiler and Microsoft Visual Studio? Thank you, Hashmi
PhD course “Hypoplasticity for Practical Applications”
Hashmi Sohawon||Constitutive Modelling|2 |
Views 4,414
Are the slides in regards to Stiffness Anisotropy for Clay Hypoplasticity for the PhD course available online? The available document {Mašín, D. (2015) Part 4: Determination of material parameters, PhD […]
ExCalibre Automatic Calibration
Marco Hofer||Constitutive Modelling|2 |
Views 4,136
Hello all, i hava a problem with the Oedometer curves after the automatic calibration with ExCalibre. I took the Dobrany sand dataset for an automatic calibration and then i copied […]
Calibration problem
Abdulaziz Abdelkadr||Constitutive Modelling|2 |
Views 4,089
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 […]
Clay Hypoplastic Model ABAQUS UMAT
Hashmi Sohawon||Constitutive Modelling|3 |
Views 4,439
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?
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 […]
Book “Modelling of soil behaviour on hypoplasticity” has been published
David Mašín||Constitutive Modelling|1 |
Views 4,567
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
Hypoplastic model for Granular soil
Naveen Meena||Constitutive Modelling|5 |
Views 4,956
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.
Calibration Sand Hypoplasticity whit ExCalibre
Francisco Mendez||Constitutive Modelling|3 |
Views 4,138
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 […]
New book “Modelling of Soil Behaviour of Hypoplasticity”
David Mašín||Constitutive Modelling|0 |
Views 7,244
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 […]
multi yield surface model
kamal paknejad||Constitutive Modelling|6 |
Views 4,668
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 […]
ExCalibre – Definiton of q
Manuel Winkler||Constitutive Modelling|3 |
Views 4,129
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 […]
ALERT Geomaterials – SoilModels support declaration
David Mašín||Constitutive Modelling|0 |
Views 4,181
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 […]
Constitutive Model for clayey sand Soils Considering the Effect of Intergranular Physicochemical Forces
Mehdi Ghatei||Constitutive Modelling|0 |
Views 4,072
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
Difficulties in calibration of triaxial test on Hochstetten sand by sand Hypoplasticity model
AKSHAY SAKHARE||Constitutive Modelling|2 |
Views 4,454
“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 […]
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 ” […]
MatLab m.file
Ala Aljorany||Constitutive Modelling|6 |
Views 5,364
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 […]
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 […]
UMAT in Geotechnics
Majdi Flah||Constitutive Modelling|2 |
Views 4,549
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 […]
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 […]
Oedometer test simulation with “Sand Hypoplasticity Model” in Plaxis
Manuel Winkler||Constitutive Modelling|2 |
Views 4,391
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 […]
Who is Online
No one is online right now
Search SoilModels Website
Recent posts
- Paper of Coulomb, C. A. (1773) 15.4.2024
- ABAQUS UMAT of hypoplastic clay model 6.4.2024
- Prague Geotechnical Days 2024 “Geotechnical monitoring” and 30th jubilee Prague Geotechnical Lecture by prof. Eduardo Alonso 5.4.2024
- UMAT for Creep-SCLAY model. 1.3.2024
- Cyclic tests with Triax element test driver 14.2.2024
- SUMMER SCHOOL ‘Numerical Modelling in Geotechnical Engineering’, Innsbruck – July 22nd-26th, 2024 1.2.2024
- COURSE IN SOIL MODELING – NTNU, Trondheim – October 14th to 18th, 2024 21.12.2023
- MSE walls design in Plaxis 11.12.2023
- sand liquefaction modelling in Anura3D 8.12.2023
- BCV bentonite experimental and modelling datasets 14.11.2023
- Challenges in simulating geomechanical models using Mohr-Coulomb with Tension Cut-Off in Abaqus 20.10.2023
- Analys soil liquefaction with Abaqus under blast load 19.10.2023
Recent Comments