[yo]

Hi @Wong,
I do not see the problem of using beams for the wires or yarns (not for the complete vessel)
We have done it with LS-Dyna for another “not classical” Geometry here
https://iopscience.iop.org/article/10.1088/1757-899X/406/1/012025/meta
and have similar not published results for bifurcated braids.
If the same approach would work with SOFA depends on that if beams can be represented there and if they capabilites to deal with contact between them.

[yo]

Hi Wong,
I am very new in SOFA but triyng to do similar issue. I think, you question has to be answered in two Levels:
1)Definition of the physical model of your soft rope (decision for mechanical structure)
2)Computational modelling of this model.

To 1) I think – in your case the most simple way to represent the behaviour is to model the structure as it is. What you describe seems to be real braided rope, it behaves exactly as you describe. Generally, in FEM You can model the single yarns as truesses, beams or solids.
How it can be done, you can read of some of my books and papers, for instance
https://www.springer.com/de/book/9783030025403
or
directly using their implementation in Texmind Braider Software. Sorry that it looks like advertisment, but I had to develop this, because I did not found anything else working for me and I had to teach this topic last decade. What I am trying now is to prepare direct Export from there to Sofa Scene, but have some troubles understanding the definitions of the beam orientation and similar issues. If you can help in this – the solution will be faster. In other case some way trough some intermediate Format should be possible
To 2) how to model this in Sofa – this should then run depending on the boundary conditions without problems after that.

[Author]

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