Hello Everyone, I am using the UMAT code for clay hypoplasticity provided by Prof. Masin — https://soilmodels.com/download/plaxis-umat-hypoplas-zip/ I made a oedometeric test model in Abaqus2018 and applied the umat code […]
Archive for category: Constitutive Modelling
UDSM PLAXIS
nasim aftahi||Constitutive Modelling|2 |
Views 4,606
I implemented a unified dynamic soil model, but PLAXIS doesn’t calculate any strains, and it prints zero (or some times NaN amounts) into a text file. I’d like to know […]
How can I solve the error in Abaqus mentioned below?
Sudipta Bhowmick||Constitutive Modelling|19 |
Views 6,159
I am using SANISAND to simulate a triaxial compression test under monotonic loading. But every time my simulations break and give the same message “Abaqus/Implicit Packager exited with an error […]
Guidance to newbie on how to calibrate a constitutive model
Osama Dar||Constitutive Modelling|0 |
Views 4,126
Hi! I am studying the behavior of kaolin clay under cyclic loading. The strain rate is kept at such that undrained behavior is maintained. I want to use an advanced […]
K0 determination Reloading using HP clay model
muhammad shakeel||Constitutive Modelling|0 |
Views 3,880
Hi Prof. Masin , It is related to my previous post. Sorry to bother you again. I simulated Oedometer test in Plaxis as well as centrifuge reloading (using HP clay […]
Soft soil and soft soil creep model both include time while performing the analysis. What is the difference between both of them.
Modelling Rate-dependent behaviour of clay [Urgent]
Balaji Bandaru||Constitutive Modelling|0 |
Views 3,852
Using PLAXIS, how to model rate dependent behavior of clay. This is to show the viscous behavior of the soil. Thank you in advance
USDM – Creep -SCLAY1S
Balaji Bandaru||Constitutive Modelling|1 |
Views 4,025
I have the license, but can’t login as it is a server license. In order to access this model, i need the .dll file. Can anyone help me with this. […]
Hardening Soil Model in Abaqus
Abulimiti Ayizula||Constitutive Modelling|5 |
Views 5,264
Is there Hardening Soil Model in Abaqus?
Effects of water content in sand in hypoplastic strength parameters
Abdiel Ramon Leon Bal||Constitutive Modelling|0 |
Views 3,813
Dear All, I am currently using the hypoplastic model for gran materials from Prof. von Wolffersdorff to simulate soil excavations in a context of large deformations. I have been searching […]
boundary surface plasticity
rakshanda showkat||Constitutive Modelling|0 |
Views 3,869
Hello all, I am trying to implement boundary surface plasticity using Bardets model in MATLAB. But i am obtaining negative values for q and Dep. Any help in this regard […]
SANISAND 2008 Model
MOHD SAQIB||Constitutive Modelling|0 |
Views 3,889
Hello Everyone, Can anyone have umat available for SANISAND 08 (Simple anisotropic sand plasticity model)?. Paper authored by Taiebat and Dafalias. They have used a closed type yield surface. Regards […]
Issues in getting the negative values of q (mean deviatoric stress) while simulating cyclic triaxial test in ABAQUS using SANISAND subroutine.
MOHD SAQIB||Constitutive Modelling|5 |
Views 4,294
Hello Everyone, I have been trying to simulate the cyclic triaxial test using the SANISAND04 subroutine. When I plotting the stress path (p-q plot), I am getting only the positive […]
UMAT for NorSand
Shile Dong||Constitutive Modelling|0 |
Views 4,500
Dear all, I am pretty new in coding and using Abaqus. I have trouble with coding the UMAT for NorSand. If any of you have any good references, please share […]
Interpreting results of sand hypoplastic model with Abaqus VUMAT
arsalan Ahmad||Constitutive Modelling|2 |
Views 4,544
Dear concern, Recently i have modelled the soil pile interaction using Abaqus CEL method. The hypoplastic behavior of the soil is model using user subroutine VUMAT. The properties of the […]
SANISAND pile-soil-interaction ABAQUS
Lee Jae Sung||Constitutive Modelling|1 |
Views 4,527
Hi everyone: I am trying to use SANISAND as the constitutive model of soil, and use ABAQUS software to simulate pile-soil interaction. First step is “Geostatic”, the second step is […]
Dear all, After carefully reading the matlab drivers of hypoplastic models, I was wondering whether the driver can simulate triaxial extension tests. As I change the constraints to reflect triaxial […]
UMAT Code for Modified Cam Clay model
Mehtab Alam||Constitutive Modelling|2 |
Views 5,016
I am trying to develop UMAT code for MCC, but facing difficulty. Is there any such files available which can help me to speed up. please refer. Thank you.
Mohr Coulomb umat in Abaqus
Shuhan Cao||Constitutive Modelling|4 |
Views 5,162
Dear all, does anyone have the umat code for Mohr Coulomb in Abaqus? For my current work I need a umat for Mohr Coulomb in Abaqus. It would be highly […]
SANISAND pile-soil-interaction ABAQUS
Lee Jae Sung||Constitutive Modelling|2 |
Views 4,175
Hi everyone: I am trying to use SANISAND as the constitutive model of soil, and use ABAQUS software to simulate pile-soil interaction. Is it better to choose “Static, Genaral” analysis […]
Abaqus user defined field
Van Doan||Constitutive Modelling|2 |
Views 4,323
Hi, I am going to use the usdfld to function the density of sand changing due to confining pressure. I am not sure Abaqus will call the usdfld for every […]
Hardening parameters (yield stress & absolute plastic strain)
Amir Mohammad Yarahmadi||Constitutive Modelling|4 |
Views 5,592
Hi to everyone I want to model a Sand with Cap plasticity or Drucker Prager failure criterion in ABAQUS, and I have the result of Triaxial test (I’ve attached the […]
Errors of sand hypoplastic model with Abaqus Vumat
Kunpeng Wang||Constitutive Modelling|11 |
Views 5,149
Dear all, Recently, I have been working on the simulation of a pile-soil interaction with CEL method in Abaqus/Explicit. I simulate the sand with the Sand Hypoplasticity Model provided by […]
Dear all, After carefully reading the matlab drivers of hypoplastic models, I was wondering why there is not mix control undrained TX compression. I want to achieve the same result […]
Hypoplastic Interface Model: Does anybody implemented this model in FLAC3D
ruohan sun||Constitutive Modelling|2 |
Views 4,066
I want to use this model to simulate soil-structure interaction in FLAC3D software, so I was wondering does anybody implemented this model in FLAC3D, and could you please share your […]
Question on implementation of sand hypoplastic model with Abaqus umat
Kunpeng Wang||Constitutive Modelling|4 |
Views 4,389
Dear all, I am a PhD student in China University of geosciences. Recently, I have been working on the simulation of a pile-soil interaction with Abaqus. I simulate the sand […]
General questions on implementation of sand hypoplasticity model with Abaqus umat
Panpan Guo||Constitutive Modelling|5 |
Views 4,597
Dear all, I am a PhD student in Zhejiang University. Recently, I have been working on the simulation of a braced excavation with Abaqus. I want to simulate the soil […]
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_sand. […]
Dear all, I am currently writing a proposal for a (small & hopefully nice) eLearning project: Within the project, I would like to create animations related to constitutive modelling. I […]
Hi all! I am modelling some triaxial compressions in ABAQUS with Weald Clay. The constitutive law i am using is the clay hypoplasticity by Mašín. When running the program using […]
SANICLAY-B (2018) how to calculate Dep
Steve Xu||Constitutive Modelling|0 |
Views 4,155
Dear fellows, I have been working on coding SANICLAY-B model (2018) . Now I have one question in terms of this model. But I am stuck now. I have two […]
Calibration of the von Wolffersdorff model using Genetic Algorithms
Francisco Mendez||Constitutive Modelling|3 |
Views 4,103
I am happy to announce that our pre-print paper, “Calibration of the von Wolffersdorff model using Genetic Algorithms”, is available on researchgate: https://www.researchgate.net/publication/342198062_Calibration_of_the_von_Wolffersdorff_model_using_Genetic_Algorithms. In this article, we propose a novel […]
Rate dependent plastic yield in Tochnog Question
Marlon Hahn||Constitutive Modelling|0 |
Views 3,979
Hi, I am new to Tochnog and really appreciate the open source modeling chain (gmsh->Tochnog->paraview). So far, I’m only familiar with commercial codes, e.g. Abaqus. I actually deal with metal […]
need help in Flac3d6
Ahmed Mahir||Constitutive Modelling|0 |
Views 4,086
dear user hello i intend to build a numerical model using flac3d 6 software i build the geometry with extrusion pane and set all values for pile – soil interaction […]
SImulation with hypoplastic model for granular materials in ABAQUS
yusheng yang||Constitutive Modelling|2 |
Views 4,363
Hello, I want to use the hypoplastic model for granular materials downloaded from https://soilmodels.com/download/plaxis-umat-hypoplas-zip. The UMAT file umat.for is the model for sand. I followed the instruction https://web.natur.cuni.cz/uhigug/masin/plaxumat/node5.html. I have […]
Cyclic Behavior of Sand
MOHD SAQIB||Constitutive Modelling|3 |
Views 3,932
Hello, Is there any constitutive model for sand which can simulate the number of cycles to reach the critical state. I used the SANISAND model but it is not promising. […]
Sanisand umat with BV problem
Luis Aviles||Constitutive Modelling|0 |
Views 3,825
Hi, Does someone know if sanisand implementation has been used in a boundary value problem for slope? do you have any references? Thanks very much!
Looking for help
Axel Grauwinkel||Constitutive Modelling|4 |
Views 348
Hello guys. I just tried to calibrate on soilmodels. I´ve done three CIUP-REC-test plus one oedometric test. As you can see in the images, that there is still something quite […]
Hi all Just a short question on the modification of the intergranular strain concept proposed by Wegener & Herle (2014) to limit strain accumulation. In terms of the numerical implementation […]
How to implement this Hypoplastic Interface Model into ABAQUS combined with the existing hypoplastic model subroutine
Geyang Song||Constitutive Modelling|8 |
Views 4,518
Hello: I’m a post-doc at the University of Nottingham, and I’m using the hypoplastic model to simulate the centrifuge tests we did. The research area is related to soil-pile interaction. […]
Implimentation of SANISAND constitutive model in ABAQUS/Standard for a soil-monopile interaction
philip alkhoury||Constitutive Modelling|4 |
Views 5,166
Dear all, I am trying to model soil-monopile interaction (3D) in ABAQUS/Standard in order to perform subsequently a cyclic and dynamic analysis. For the soil I am using the SANISAND […]
Hi David, Can you please provide some comments on the ability of the Hypoplasticity model with intergranular strain concept to model the effects of recent stress history on the clay […]
Problems with the UMAT subroutine check_parms_DM of the SANISAND constitutive model
meng xiaowei||Constitutive Modelling|3 |
Views 4,342
Where can I find the source of the content in the picture below in the UMAT subroutine check_parms_DM of the SANISAND constitutive model?
3D analysis with Basic Hypo-Plastic Model
sobhan abedinnejad||Constitutive Modelling|2 |
Views 3,901
Dear all Is the basic Hypo-Plastic model (Wollffersdorff’s model) suitable for 3D models? Can I analyze 3D models with this UMAT? (https://soilmodels.com/download/umat-hyposand-uibk/) Thank you Sobhan
Modified Cam clay model now supported in automatic calibration software ExCalibre
David Mašín||Constitutive Modelling|6 |
Views 4,785
Free SoilModels automatic calibration software ExCalibre, available at, https://soilmodels.com/excalibre/, now supports Modified Cam clay model. This is both for laboratory test simulation as well as for automatic calibration. We hope […]
Shear Stiffness Calculation for Hypoplastic Model
Hashmi Sohawon||Constitutive Modelling|4 |
Views 4,129
Hi David, I have reproduced some single elements test on ABAQUS using the UMAT to compare with Triax Hypoplasticity. So far, my stiffness curve (q vs ea) and my stress […]
Hypoplastic UMAT error ABAQUS
Hashmi Sohawon||Constitutive Modelling|2 |
Views 4,821
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 […]
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