[Feature]: include bond associated formulation

[CWillberg]

What are you trying to do and how would you want to do it differently?

I would like to include bond associated formulation

Is it something you currently cannot do? Is this related to an issue/problem?

No response

Implementation details

• include the bond shape tensor
• include the bond deformation gradient
• include the weighted volume

Would you be willing to submit a PR?

No