FIX: Change units in non linear properties

[Samuelopez-ansys]

Make method public to change the units if needed

Description

Please provide a brief description of the changes made in this pull request.

Issue linked

Close #6097

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved by the PR if any.
• I have agreed with the Contributor License Agreement (CLA).

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[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.16%. Comparing base (fc81bcc) to head (82cc9ca).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6130      +/-   ##
==========================================
+ Coverage   85.14%   85.16%   +0.01%     
==========================================
  Files         167      167              
  Lines       63596    63596              
==========================================
+ Hits        54148    54159      +11     
+ Misses       9448     9437      -11     

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