Hi everyone, i am modeling laterally loaded monopile using abaqus, My 3d model looks like this, only half of the model is simulated, symmetry boundary conditions is applied to the sym plane.
I have calibrated the Hypopalstic sand model to match some published lab tests as you can see on the figure, the soil is quiet stiff (G0=60000 at 50 kpa confining pressure).
interface is simulated using contact penalty with a coefficient of 0.4
The load is applied at the top of the monopile
3 Steps are defined : 1 and 2 are load initialization, and 3 is where the lateral load is being applied.
Both soil and pile are simulated using C3D8 elements.
when I run the simulation, I get a convergence problem after few itterations, no error message in particular (except the ‘too many attempts made for this increment’)
i have tried with elastic material and it works perfectly, so I am wondering if the problem is with the Hypoplastic sand model
Hypoplasticity sand convergence issues
Related Articles

Problem with Hypoplastic Vumat use with CEL in Abaqus
Abdulkader ELHAJFinite Elements0 Views 1,257
Hello all, I am currently working on the FE modeling of anchors installation into the soil using the CEL analysis in Abaqus. I tried to use the hypoplastic vumat for […] 
Tochnog Professional Page moves
Dennis RoddemanFinite Elements1 Views 1,181
Hi All, Starting from Saturday January 26 2019 the Tochnog Professional page moves to http://www.tochnogprofessional.nl Best, Dennis Roddeman 
Hypoplastic model for clays in a Plaxis 2D simulation – Problem
Daniel ValenciaFinite Elements2 Views 1,110
Hello everybody, Using Hypoplastic model for clays, with intergranular concept parameters, I am simulating a simple oedometer test, phase by phase, using a dummy layer on the top of the […] 
problem with sanisand umat
yousef zandFinite Elements8 Views 1,404
Dear all, I’m trying to model multilayer soil in abaqus. To use the SaniSand umat in model I use the following parameters but no plastic strain at all. The unit […] 
Using pore fluidstress element in SandSand
Kassem DibFinite Elements1 Views 1,371
Hello everyone, Is it possible to use pore fluid stress element in abaqus standard when soil is modeled using SANISAND constitutive model ? (UMAT) 
Modeling of triaxial test sample by using hypoplastic subroutine
Naif AlsanabaniFinite Elements7 Views 1,673
I tried to model sample of triaxial test in Abaqus program. I used hypoplastic subroutine. The parameters used in hypoplastic model was Hochstetten sand the given in website “https://web.natur.cuni.cz/uhigug/masin/plaxumat/node5.html”. The […] 
Calibrate hypoplastic model
sahar saabFinite Elements2 Views 1,247
I am trying to calibrate my sand using Excalibre. I tried some triaxial element tests using Abaqus. However the results are different between Excalibre and Abaqus. 
Slope stability calculation with hypoplasticity using phic reduction available now in download section
David MašínFinite Elements0 Views 1,608
The strength reduction method in clay hypoplasticity now available
0 Comments
Who is Online
No one is online right now
Search SoilModels Website
Recent posts
 A question about the hypoplastic model in clay 22.9.2022
 A HighCycle Accumulation Model for Sand (Niemunis et al., 2005) 6.9.2022
 Malaysian kaolin – Cyclic tests by Charles University 5.9.2022
 Problem in calculating Lateral displacement of the pile using Hypoplastic clay model 2.9.2022
 GTS NX 25.7.2022
 Special issue of Computers and Structures “Numerical simulation of multi‐physics phenomena in geotechnical structures” 25.7.2022
 Postdoctorate position at Nantes University (France) in geotechnical analysis of mutualized anchors 6.7.2022
 SIFEL – THM Model for Bentonite Barriers 27.6.2022
 ABAQUS job doesn’t make any increment 22.6.2022
 NorSand model for cyclic triaxial testing 9.6.2022
 Postdoc position at Charles University in the field of THM analysis of unsaturated and heated soil cyclic loading 30.5.2022
 Shear modulus degragation 12.5.2022
Recent Comments
 Wenbo Gu on A question about the hypoplastic model in clay
 Muhammad Ahmad on A question about the hypoplastic model in clay
 Wenbo Gu on A question about the hypoplastic model in clay
 Muhammad Ahmad on A question about the hypoplastic model in clay
 Muhammad Ahmad on Problem in calculating Lateral displacement of the pile using Hypoplastic clay model
 David Mašín on Problem in calculating Lateral displacement of the pile using Hypoplastic clay model
 Jie Wang on Interpreting results of sand hypoplastic model with Abaqus VUMAT
 Muhammad Ahmad on Problem in calculating Lateral displacement of the pile using Hypoplastic clay model
 David Mašín on Problem in calculating Lateral displacement of the pile using Hypoplastic clay model
 Raj Banerjee on SANISAND Abaqus UMAT and Plaxis implementations
 Amrane Moussa on Special issue of Computers and Structures “Numerical simulation of multi‐physics phenomena in geotechnical structures”
 Riccardo Zabatta on Modelling TX monotonic compressive test with ABAQUS and SANISAND – not working
 Haibo Jiang on Download Package for Hypoplastic interface model and UMAT – FRIC interface
 Giada Orlando on Hardening Soil Model in Abaqus
 Sanchari Mondal on Modelling TX monotonic compressive test with ABAQUS and SANISAND – not working
 Dimitrios Konstantinidis on multi yield surface model
 Frank Richter on multi yield surface model
 Dimitrios Konstantinidis on multi yield surface model