Different results between Abaqus Script and GUI

[shindok]

Hello everybody,

Using Abaqus 6.11 for a classic mechanical study of an assembly (3 parts), i'm facing an issue and i cannot find the solution online.

My problem is the following:

As i'm dealing with a lot of simulations i'm gathering all the results (VonMisesMax, Max Principal Stress max) from odb files into a text file using a script highly inspired from this one :

http://abaqusdoc.ucalgary.ca/books/cmd/pt05ch09s10.html#cmd-odb-intro-exa-maxmises-pyc

The issue is that the value given by this script for the VonMisesMax is different from the value given by ABAQUS using the graphic interface when I ask it to auto-calculate the maximum value of VonMises. (i have the same issue for max principal stress)

I'm a little bit lost because I have no idea which value to trust in my study.

Thank you for your help

 

[Mustaine3]

The difference might come from the location where the value is taken from.

In the Viewer you'll see a value that is extrapolated from the integration points to the nodes and then averaged.
In the script you'll probably just have the values from the integration points. No extrapolation, no averaging.

 

[DrBwts]

The script looks like its querying element-wise values so in principle it should be using the interpolated values.

I would have a look at the script file generated by Abaqus when using the GUI against the script you are using & see what differences exist in the query commands.

If you are looking at certain elements there may be a numbering issues between Python & CAE, seem to remember a colleague having such issues once.