I tried to create a set of nodes which is a difference between two node sets using SetByBoolean, where I get the following message:
>>> mdb.models['Model-1'].rootAssembly.SetByBoolean(name = 'anew', sets = [mdbra.instances['fibres-1'].sets['fibre_od'], mdbra.instances['fibres-1'].sets['dummy']], operation = DIFFERENCE)
NameError: name 'DIFFERENCE' is not defined
What could be the reason, and a solution?
Errors of type: name 'x' is not defined, are generated when you try to use x without defining it previously.
it seems like you tried to pass the variable DIFFERENCE without defining it first.
could it be that you are missing the quotation marks around DIFFERENCE? like: operation = "DIFFERENCE"?
I figured it out. The boolean operation is defined between sets of nodes, or surfaces. But not between a set, and a surface. That was the error.
I'm late to the party here, but I had the same problem. For me, the issue wasn't about how I defined the sets. Rather, in the Abaqus python scripting environment, whenever you use pre-defined keywords (like DIFFERENCE or UNION, or other similar keywords like MISES when inspecting a fieldOutput object) you have to explicitly import them into the python environment. So, you have to either include at the beginning of your script, or type into the little python box at the bottom of CAE, the following line:
from abaqusConstants import *
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