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
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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