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.
Calibrate hypoplastic model
Related Articles
-
new hypoplasticity laws in Tochnog Professional
dennis roddeman||Finite Elements|1 |
Views 849
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 […] -
ABAQUS Mesh-to-mesh solution mapping with Modified Cam Clay
Samanthika Liyanapathirana||Finite Elements|0 |
Views 1,125
I am using the mesh-to-mesh solution mapping with MCC model. The element type used is CPE8RP. My initial analysis runs without any issue and when the deformations reach a certain […] -
Hypoplastic model for thermal cycles (Abaqus)
Chiara Iodice||Finite Elements|2 |
Views 1,016
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 […] -
Skin friction along depth of pile
Md Shafiqul Islam||Finite Elements|0 |
Views 855
Dear all, I am simulating static pile load test in the rock by using ABAQUS. For comparison of numerical results with the experimental, I need skin friction vs depth plot. […] -
Calculation of coordinates of climbing formwork using hypoplasticity and pressuremter tests
Christian Schwab||Finite Elements|0 |
Views 819
Our article published in the latest issue of Ground Engineering 10/2017. Great combination of cone-pressueremeter-testing (CPM) by FUGRO and advanced 3D Fem modelling by GEOLINK using hypoplastic constitutive equations to […] -
Consolidation analysis using HP clay model in Plaxis
muhammad shakeel||Finite Elements|1 |
Views 1,243
Dear Prof David / SOil model community, I am performing coupled consolidation analysis for deep excavation in clay using HP clay model in Plaxis 3D. Performing the undrained analysis, the […] -
Hypoplasticity sand convergence issues
anis kheffache||Finite Elements|0 |
Views 858
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 […] -
Modeling of triaxial test sample by using hypoplastic subroutine
Naif Alsanabani||Finite Elements|7 |
Views 1,156
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 […]
Search SoilModels Website
Recent posts
-
Shear modulus degragation 12.5.2022
-
FRIC code for clay hypoplasticity interface 23.4.2022
-
Hypo-umat sand 18.4.2022
-
Hypo-umat sand 18.4.2022
-
Using pore fluid-stress element in SandSand 9.4.2022
-
“Warning LNK4210” – hypoplastic clay UMAT 8.4.2022
-
Prague Geotechnical Days 2022 with Prague Geotechnical Lecture by prof. Cino Viggiani 7.4.2022
-
Micropiles load tests database 26.3.2022
-
DIANA 10.5 new features 10.3.2022
-
Input files for element tests for hypoplastic clay/sand UMAT 6.3.2022
-
Combining Hypoplastic-sand and Hypoplastic-clay in one UMAT file 2.3.2022
-
UMAT code for Unsaturated soil modes 19.2.2022
Recent Comments
- Alireza Lajmiri on Download package of ISA cyclic hypoplasticity for Abaqus
- Baban Bapir on Shear modulus degragation
- Rakshanda Showkat on SANISAND for FLAC3D Download
- HaoRan OUYANG on Using pore fluid-stress element in SandSand
- HaoRan OUYANG on Course “Hypoplasticity for Practical Applications”
- Miracle Dai on Hypo-umat sand
- Kassem Dib on liquefaction simulation with abaqus
- Kassem Dib on liquefaction simulation with abaqus
- Kassem Dib on liquefaction simulation with abaqus
- Kassem Dib on Transient Dynamic analysis (U-P formulation)
- Yifei Sun on matlab driver
- SPARSHA SINDURI NAGULA on SANISAND Abaqus UMAT and Plaxis implementations
- Srinivas Vivek Bokkisa on Modelling TX monotonic compressive test with ABAQUS and SANISAND – not working
- MOHD SAQIB on Modelling TX monotonic compressive test with ABAQUS and SANISAND – not working
- Srinivas Vivek Bokkisa on Modelling TX monotonic compressive test with ABAQUS and SANISAND – not working
- Jesus Mediavilla on DIANA FEA 10.3 new release – special on geotechnics
- Keng-Wit Lim on UMAT code for Unsaturated soil modes
- MOHD SAQIB on Modelling TX monotonic compressive test with ABAQUS and SANISAND – not working
Hi Sahar, please also check the initial void ratio for triaxial tests indicated by excalibre. This is the only issue I can think about, otherwise you have some error in Abaqus input.
Hi David, this is the input file for my abaqus model. This input file is for the sand example “lapProtocalTemplate-Sand” shared on Excalibre automatic calibration page. I got the hypoplastic parameters from Excalibre and input them into Abaqus. The peak of deviatoric stress-strain curve from Abaqus is much higher than the experimental curve and the Excalibre curve. I can’t find the mistake in my input.
*Heading
** Job name: CD-50-Excalibre-Sample-Sand Model name: CD-50-Excalibre-Sample-Sand
** Generated by: Abaqus/CAE 2016
*Preprint, echo=NO, model=NO, history=NO, contact=NO
**
** PARTS
**
*Part, name=Part-1
*Node
1, 0., 0.
2, 0.100000001, 0.
3, 0., 0.100000001
4, 0.100000001, 0.100000001
5, 0.0500000007, 0.
6, 0.100000001, 0.0500000007
7, 0.0500000007, 0.100000001
8, 0., 0.0500000007
*Element, type=CAX8
1, 1, 2, 4, 3, 5, 6, 7, 8
*Nset, nset=Set-1, generate
1, 8, 1
*Elset, elset=Set-1
1,
*Nset, nset=top-n
3, 4, 7
*Nset, nset=bot-n
1, 2, 5
*Nset, nset=axis
1, 3, 8
** Section: Section-1
*Solid Section, elset=Set-1, material=Material-1
,
*End Part
**
**
** ASSEMBLY
**
*Assembly, name=Assembly
**
*Instance, name=Part-1-1, part=Part-1
*End Instance
**
*Elset, elset=EL, instance=Part-1-1
1,
*Elset, elset=_Surf-1_S2, internal, instance=Part-1-1
1,
*Elset, elset=_Surf-1_S3, internal, instance=Part-1-1
1,
*Surface, type=ELEMENT, name=Surf-1
_Surf-1_S2, S2
_Surf-1_S3, S3
*End Assembly
**
** MATERIALS
**
*Material, name=Material-1
*Density
1.0927,
*Depvar
13,
*User Material, constants=16, unsymm
36.5, 1.,49846., 0.243, 0.572, 1.144, 1.372, 0.09
4.5, 0., 0., 0., 0., 0., 0., 0.51
**
** BOUNDARY CONDITIONS
**
** Name: axis-bc Type: Displacement/Rotation
*Boundary
Part-1-1.axis, 1, 1
** Name: bot-bc Type: Displacement/Rotation
*Boundary
Part-1-1.bot-n, 2, 2
** Name: top-bc Type: Displacement/Rotation
*Boundary
Part-1-1.top-n, 2, 2
**
** PREDEFINED FIELDS
**
** Name: Predefined Field-1 Type: Geostatic stress
*Initial Conditions, type=STRESS, GEOSTATIC
Part-1-1.Set-1, -50., 0.1, -50., 0., 1., 1.
** Name: Predefined Field-2 Type: Void ratio
*Initial Conditions, TYPE=RATIO
Part-1-1.Set-1, 0.51
** —————————————————————-
**
** STEP: Step-1
**
*Step, name=Step-1, nlgeom=NO
*Geostatic
**
** LOADS
**
** Name: Load-1 Type: Pressure
*Dsload
Surf-1, P, 50.
**
** OUTPUT REQUESTS
**
*Restart, write, frequency=0
**
** FIELD OUTPUT: F-Output-1
**
*Output, field
*Node Output
U,
*Element Output, directions=YES
E, S
**
** HISTORY OUTPUT: H-Output-1
**
*Output, history, variable=PRESELECT
*End Step
** —————————————————————-
**
** STEP: Step-2
**
*Step, name=Step-2, nlgeom=NO, inc=1000
*Static
0.001, 1., 1e-15, 1.
**
** BOUNDARY CONDITIONS
**
** Name: top-bc Type: Displacement/Rotation
*Boundary
Part-1-1.top-n, 2, 2, -0.05
**
** LOADS
**
** Name: Load-1 Type: Pressure
*Dsload
Surf-1, P, 50.
**
** OUTPUT REQUESTS
**
*Restart, write, frequency=0
**
** FIELD OUTPUT: F-Output-1
**
*Output, field
*Node Output
U,
*Element Output, directions=YES
E, S
**
** HISTORY OUTPUT: H-Output-1
**
*Output, history, variable=PRESELECT
*End Step