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Cheatsheet for post-processing Abaqus results with Python
This is a draft cheat sheet. It is a work in progress and is not finished yet.
Open the output database (.odb)
Import the post-processing library |
>>> from odbAccess import *
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open the output database |
>>>myOdb = openOdb(path='path\myfile.odb')
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Once you've created your odb object, you can access all the variables throught the different attributes of the class. In the following cheatsheet, we only point out the way to access the results that mostly interest us such as Field Outputs and History Outputs
Accessing to Field Outputs
In the odb object we will access the steps attribute, then the frames attribute to get our field output.
>>>steps = myOdb.steps
>>>frames = steps['my_step_name'].frames
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List of the main attributes in a step
description |
domain |
frames |
historyRegion |
inertiaAboutCenter |
inertiaAboutOrigin |
loadCases |
mass |
massCenter |
name |
number |
previousStepName |
procedure |
timePeriod |
totalTime |
List of the main attributes in a frame
frames.description |
Return descrition if given |
frames.domain |
TIME or FREQUENCY |
frames.fieldOutputs |
return all the different outputs you specified in the simulation for each node and element |
frames.frameId |
frames.frameValue |
return the simulation time as a float |
frames.incrementNumber |
return the increment number as an integer |
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Which field outup do we usualy encounter
NODAL OUTPUTS |
U |
displacement |
UR |
rotational displacement |
COORD |
coordinates |
RF |
Reaction force |
ELEMENT OUTPUT |
S |
SMISES |
Exemple to access the displacement along the x axis (U1), for a given node:
>>>myOdb = openOdb(path='path\myodb.odb')
>>>frame1 = myOdb.steps['Step-1'].frames[-1]
>>>t = frame1.frameValue
>>>u1 = frame1.fieldOutput['U'].values[27].data[0]
For all possible outputs, see the official Abaqus documentation
Main attributes in a fieldOutput object
componantLabels |
description |
name |
type |
values |
all the main values are stored in values[myNode].data
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What about the instance
the Root Assembly |
The odb object has an attribute rootAssembly, which gives informations about assembly such as: |
elementSets |
elements |
instances |
name |
nodeSets |
nodes |
rigidBodies |
sectionAssignement |
surfaces |
Access History Output results
In your simulation, you may have specify History Outputs for several sets. Your odbStep object has an attribute named historyRegion in which you will find all the sets that have history output, as historyOuptut Objects. In such objets are stored all the history outputs specified in your simulation.
region = myOdb.steps['stepName'].historyRegions['Node PART-1-1.15']
Here is a quick exemple to access to time and volume in a fluid cavity:
>>>myStep.historyRegions['Node PART-1-1.1565'].historyOutputs[CVOL].data
returns a tuple organized as:
((t1,CVOL1),(t2,CVOL2)...)
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