Nodal strain outputs using Abaqus Python for Post-Processing

[MJoeS]

Hello all!

After going through all possible forums, I haven't been able to solve the problem of accessing nodal output variables using python to post-process my results. My model is just a simple beam model (Eltype=B31), that is subjected to bending. In this case I want to extract the nodal strain values at the top of the beam. Getting the values at the integration points proves no trouble. However generating a subset of nodal outputs doesn't seem to work. Instead of getting 1 output value per element as when using Int. Points as fieldOutput, I get two values per element. These values are however equal to each other and equal to the result at the integration point... I have requested 'element output, position=NODAL' in my input file. Can anyone help me with finding my mistake? Thank you very much in advance!

Here is my code:

# Open the output database.
psOdb = odbAccess.openOdb(path='bend-El-Output.odb')
# Select Node Set
elset=psOdb.rootAssembly.instances['PART-3-1'].elementSets['ELSET'] # Just a collection of all elements in the beam
nset=psOdb.rootAssembly.instances['PART-3-1'].nodeSets['NSET']

sCat = psOdb.SectionCategory(name='SC',description='n/a')
sP = sCat.SectionPoint(number=2,description='n/a')

A=psOdb.steps['Bending'].frames[10].fieldOutputs['LE'].getSubset(position=ELEMENT_NODAL, region=elset) #position=INTEGRATION_POINT works fine
A.getSubset(sectionPoint = elset.elements[0].sectionCategory.sectionPoints[4])

print A.values[2].data[0] # Probe a value of LE11

Cheers, Morten

 

[Mustaine3]

Have you tried to use the node set and nodes as region?

 

[MJoeS]

I tried that indeed, but it didn't give me results whatsoever

But a B31 element has 2 integration points right? Because when probing values in the viewer I can only find 1 value for integration point results. And with 1 integration point I can't see how interpolation can be applied in the element.. It also seems that only averaging is applied when nodal values are output in the viewer.