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Re: Sign convention contact laws

 


I would love to use local system, but I don't see a way to define it.
What about lattice beam elements that have non-circular section and
such?

Define the principal axis of the section in the global coordinates and project the displacement on them? It should not be a problem, and can be done in the constitutive law (principal axis are constitutive parameters of the beam).

I would love ks=kn, so we can just skip the normal and write force=rel_disp*k. :-P

Bruno



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