These scripts are used to extract inputs needed for CASSY assessments from FEM simulations. More info on CASSY here.
Table of contents:
In CASSY, for each submodel, a csv file is expected to contain the linearized stress tensors at different paths and timesteps. The following scripts help bridging FEM simulations with this kind of input format.
An APDL macro is available to extract linearized stresses in CASSY format.
The logic of such macro has been ported to a python script for an easier and more general use. In order to use the python script, pandas and ansys-mapdl-core python package need to be installed. The following inputs are expected from the user:
- ANALYSES: a dictionary where the key are the name of the analysis (i.e., the same that will be used in CASSY config file) and the values are tuple that for each analysis provide a path to the correspondent .rst file and .cdb file
- OUTFOLDER: path to where to dump the final .csv file (CASSY input of linearized stresses) and APDL log.
- PATH_NODES: dictionary listing the IDs of inside and outside node for each path to be extracted.
- NDIV: number of division points to be used in the paths creation.
The script extract_paths_mechanical.py is meant to be read in the ACT Python console of ANSYS Mechanical and executed (Scripting tab).
Before running:
- ensure to have solved all the analyses/solution combinations you need.
- define your paths by naming them: "path_1", "path_2", etc. Use this simple "path_" format or the chain will break down the line.
- define a named selection containing only solid 3D bodies. Needed for the scoping of the paths.
The script will generate linearized stress objects, retrieve the result and export the stresses automatically for all paths defined by the user.
The following parameters control the script execution:
EXTRACT_FOLDER: root path to where data should be exported.TO_EXTRACT: list of analyses name (i.e. the one in the mechanical tree) where results have to be extracted. Solution combinations objects are accepted.PATHS_NAMES: list of names of paths to be extracted. If None, all paths will be automatically detected.BODIES_SELECTION_NAME: name of the bodies named selection. This named selection is needed because in case the model has beams or shells, the automatic definition of linearized stress objects would fail.
After the script is executed, the following folder structure should appear:
---root
|---analysis 1
│ |---Loadstep1
│ |---Path 1
│ │ |---Stresses.txt
... ....
At this point the various Stresses.txt files will need to be combined to produce the model.csv file in a proper CASSY format using mechanical_to_cassy_paths_format.py.
This script can be executed from any python environment that has pandas installed and requires as input parameters only the path to the root folder. A model.csv file will be dumped in the root folder, ready to be used as CASSY input.
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Until a pure APDL script is uploaded, the one of beam bolts can be used.
For beam bolts a simple script is provided that levarages pyMAPDL to read .rst files and extract data trough APDL commands.
This can be used both in Workbench and APDL workflows. It needs to be executed in an environment that has pandas and ansys-mapdl-core python package installed. The following inputs are expected from the user:
- ANALYSES: a dictionary mapping the names of the different analyses to their .rst file.
- Beam_IDs: dictionary mapping each bolt ID to the correspondent mesh element ID where actions need to be extracted.
- OUTFOLDER: folder where to dump the resulting .csv file ready for cassy usage.
For a given analysis in ANSYS Mechanical is possible to export a csv file that summarize all bolts reaction forces at all time steps. By using the ANSYS Mechanical Bolt Tool, use the reaction probes wizard to select all your bolts, then select the analyses from which reaction forces have to be extracted, select ALL time points.
After some time, in the SYS-XX/MECH folders of your analyses a csv file will appear with the following format:
For each analysis, rename the csv file as Bolt Reactions.csv and organize them in the following folder structure in root/actions folder:
root.
├───actions
│ │
│ ├───THBSL1
│ │ Bolt Reactions.csv
│ │
│ ├───THOMDSL1
│ │ Bolt Reactions.csv
│ │
│ └───THONIS
│ Bolt Reactions.csv
│
├───config
│ main_bolts.xlsx
│
├───geometries
│ M12_bolt.xlsx
│ M12_insert.xlsx
│ M3_bolt.xlsx
│ M3_insert.xlsx
│ M5_bolt.xlsx
│ M5_insert.xlsx
│ M8_bolt.xlsx
│ M8_insert.xlsx
Now, the script mechanical_to_cassy_bolts_format.py will create a proper main_bolts.csv file in CASSY format, in the actions folder. First, ensure you set your config file name correctly. The script will ask for the root folder and for all model.xlsx file in the config folder, it will extract a model.csv file in actions folder and another file to associate ANSYS Bolt name to CASSY ID.
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