getResultsFromFRD.py : Extract Results from PrePoMax/CalculiX

Tips & Tricks
1

Hi,

First of all thank you all for your contributions to open source FEM .

If you need to get:

  • Undeformed node locations
  • Nodal Displacements
  • Nodal Stress Tensor
  • Nodal Strain Tensor
  • Nodal Forces

to work with, so you can use these python code to extract them from .frd result file and also export as .csv with the same results file name.

***I’m new around here and also on GitHub. Please don’t hesitate to warn me if I make a mistake regarding opening a topic or any rule. I apologize in advance. :slight_smile: ***

Adding GitHub link here.

Descriptions below

getResultsFromFRD.py : Extract Results from PrePoMax/CalculiX

What this code does?

This script helps you to extract and export nodal results from PrePoMax or CalculiX.

Usage Instructions is Not Needed Actually But…

  1. Generate Result File
    After running a simulation with PrePoMax or CalculiX, a result file (result.frd) will be generated.
  2. Set the File Path
    Provide the path to the .frd file in the Python script @line#3 ----> frd_file_path = "C:\\Users\\RESULT_FILE.frd"
  3. Run the Script
    When you execute the Python code, it will automatically compile nodal results into a pandas DataFrame named “df_results” and also export to .frd file path as .csv with same name.

Extractable Data

The following data can be extracted from the result file (RESULT.frd) and processed as a pandas DataFrame:

  • Undeformed node coordinates
  • Nodal deformations
  • Nodal stress tensor components
  • Nodal strain tensor components
  • Nodal forces

If you encounter anything unexpected or have any suggestions, please don’t hesitate to reach out to me.

6 Likes
4

You can do this using PrePoMax. First prepare the history output for the data you need and then use Results → History Output → Export to save the data in a .csv file.

5

Hi,

I have been using the feature you mentioned while running 1 or 2 analysis also. But it is not feasable when you run 5-10 or more analysis especially for optimization or different load case scenarios sequentially. So you need to parse the .frd or .dat results in a dataframe or any kind of data structure easy to work with later on.

6

Agee. Currently, this is a problem. However, there are some automation options to run PrePoMax from the command line by using parameters to change the model.

I am in the middle of adding support for saving the Command history to a file and then adding the possibility to run it as a script. In this way, results post-processing could also be automated.

7

I got it.

I don’t think that if you need it but you can use any part or full versions of my codes.

By the way I’ve never used parameters option actually i don’t even know how to use it.

On the other hand, working with PPM in command line especially inside the program would be a good way (hope Python :)).

Anyway, thank you again to you and your friends who contribute these beautiful works.
Have a nice day and a nice year to you all.

1 Like