Hello everybody,
I am doing one residual stress simulation. I have two part instances which come in contact and one of them has non-uniform residual stresses from the beginning. I have written *SIGINI subroutine to apply non-uniform initial stress. I tried to apply this stress using python script whose Macro is as follows:
def Macro2():
import section
import regionToolset
import displayGroupMdbToolset as dgm
import part
import material
import assembly
import optimization
import step
import interaction
import load
import mesh
import job
import sketch
import visualization
import xyPlot
import displayGroupOdbToolset as dgo
import connectorBehavior
del mdb.models['208_Bearing_Residual_Run_2'].predefinedFields['Predefined Field-1']
cliCommand("""a1=mdb.models['208_Bearing_Residual_Run_2'].rootAssembly""")
cliCommand("""e1=a1.instances['Inner Raceway-1'].elements""")
cliCommand(
"""elements1 = e1.getSequenceFromMask(mask=('[#ffffffff:3972 #1 ]', ), )""")
cliCommand("""region=a1.Set(elements=elements1,name='Set-20')""")
cliCommand(
"""mdb.models['208_Bearing_Residual_Run_2'].Stress(name='Predefined Field-1',region=region, distributionType=USER_DEFINED)""")
After running this script, Abaqus does create predefined field. But it doesn't recognize that distribution type is non-uniform and needs to taken from user defined subroutine *SIGINI.
Is there anything wrong with the Python script?
Any input is appreciated,
Thank you in advance,
Sincerely,
Nik
Looking through your python script, you are referring to a user-defined to read your distribution and you are asking why it does so?
Nope. After running this script Abaqus doesn't recognize that user defined initial stresses are used. It just creates predefined field with uniform stress distribution of 0, which is not expected. Also, in this script, I am applying user defined initial stress field to elements of only one part instance. Abaqus fails to recognize this as well. It assigns uniform stress field of 0 to both the part instances.
What does your input deck look like? If Abaqus/CAE has correctly written the line used to apply the stress field, eg.:
*Initial Conditions, type=STRESS, USER
the error is most likely in the user subroutine. On the other hand if this line is omitted or is incorrect, then the issue is obviously with the script you're using to generate the input deck.
i'm not sure if this is relevant, but note that you can only have predefined fields of type=STRESS in the initial step of an analysis... If that was the problem then you would probably have got an error message to that effect though.
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