Hello fellow researchers,
I am working on modeling mechanical tests of polymer materials using ABAQUS. I want to calibrate the custom material model (UMAT) parameters using inverse analysis. For my inverse analysis to work I need to vary the input material model parameters within a range and get the corresponding load-displacement data from the .odb file.
Since the number of simulations are high, I was thinking of using the parametric study feature of ABAQUS. If anyone can share their piece of python (.psf) code, I could get a better idea on how to write one for my project.
Can anyone please help me?
Hi,
Please see below example.
I'm modifying the load (similarly, you can modify the material parameters in your case)
First, you need to define the parameter in Abaqus input file. For example, i is the parameter in my example.
*PARAMETER
i=10.0
** LOADS
**
** Name: Load-1 Type: Concentrated current
*Cecurrent
myNodes, ,
Now, write *.psf file as follows:
Variable=ParStudy(par='i', name='ACSR')
Variable.define(DISCRETE, par='i', domain=(6000, 7000, 8000))
Variable.sample(NUMBER, par='i', number=3)
Variable.combine(MESH)
Variable.generate(template='check')
Variable.execute(ALL)
You need to modify the highlighted parameters in the above line.
ACSR is some name given to parametric study.
check is the Abaqus input file name.
remaining entries are self explanatory.
Hope it helps. Please let me know if you have any questions.
Regards,
Ranjith.
Read the pdf in the link. You will see that: 1. using the CAE GUI and 2. an abaqus online manual you will be able to write your own script that fits your needs.
regards
http://softroboticstoolkit.com/files/sorotoolkit/files/learnabaqusscriptinonehour.pdf
Here is researchgate reference to my example of the script intended to performing loop computations with possibility to change material parameters, as well as creating envelope plots etc. Look for "How to write scripts for Abaqus" in researchgate.
Dr. Kuznetsov, thank you so much for sharing the script. I will deeply look into it.
Dear all
I want to do something similar. I am working on modeling some structures with tuned mass damper using ABAQUS. I want to calibrate the tuned mass damper parameters using an iterative form. Thats means that I will need the accelerations from the .odb file and I will check if that are correct (
Hi Ranjith
Thank you so much for providing the useful code.
I used it and also I insert the following command in order to find the results after each step.
cbeam.gather(results='VDISP',variable='U2',node=23,request=HISTORY, Model="PB0N4")
Now the problem is that, I have different parts in assembly and I want to find the displacement not in the single instance but in the whole model.
I tried assembly, model and other thing but it didn't work.
Any suggestion for this problem.
Regards
Ahmad
Dear Afaq,
here is an example of the script with a lot of variable parameters; reference:
https://www.researchgate.net/publication/290102699_How_to_write_scripts_for_Abaqus_an_example_of_a_comprehensive_script_containing_creation_of_non-reflecting_boundaries_loop_computations_data_filtering_visualisation
Research How to write scripts for Abaqus: an example of a comprehensi...
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