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Inventor Nastran Error 5059

Inventor Nastran Error 5059

Inventor Nastran Error 5059

Hello all,

I have started working with Inventor Nastran just recently (I have only little previous experience in FEM) and I am facing problems in setting up a load case for a cylindrical structure. I constructed the structure as a cylindrical surface and generated a shell mesh with a laminate attributed to it. The lower edge is constrained in x, y and z translation, the upper edge in x and z translation. There is a (compressive) line force acting on the upper edge in the y-direction. The analysis type is linear buckling.
When executing the model I receive an error 5059, for which the docs read:
The second link states that an improper force may be assigned to the mesh (one that doesn't cause buckling). Any ideas?
[EDIT 1: Find a screen snap of the model attached to this post.]
Thanks in advance!

RE: Inventor Nastran Error 5059

Found a solution. Apparently, a distributed force (in N/mm) is not acceptable in this case. I changed the load to a force (in N) acting on the same edge, and the solver works without problems.

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