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Stiffness matrix for 3D circular beams and conical tubes.

Stiffness matrix for 3D circular beams and conical tubes.

Stiffness matrix for 3D circular beams and conical tubes.

(OP)
I'm looking for the 3D stiffness matrix for a 3D circularly bent (or elliptical) beam.
Also for a conical, thin walled tube.
I found an article from 1985, and I think there are a few errors in it, so I want to compare.
Are there any good, more recent sources for this kind of info?
Are there any handbooks for stiffness matrices around?

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