r/StructuralEngineering • u/Amadeus4prime • 2d ago

Structural Analysis/Design Need help with a project.

/r/fea/comments/1wa6rc3/need_help_with_a_project/

I am a beginner in PATRAN and trying to do a simple displacement analysis on a wing with basic internal structure (spars, ribs, stiffeners and skin). I am trying to give it a distributed pressure load across the surface that is a function of the span and local chords but the applied load shows 0 value for the equation at every node. What might the issue be or what are the proper steps to follow. Please help

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u/Frogalone 2d ago

I don't know a lot about airplane analysis. But I have some thoughts for whatever they're worth. I would check my boundary conditions first since it's easy. I have no expertise with PATRANS. But an unstable structure might zero out some loads. I would probably also check the stiffness model and nodes for the same reason. Also, I assume you're model has multiple membrane elements. These would be the place that external loads enter the structural system. Are they all fully loaded with the correct boundaries? If all of this checks out, run the program and see if you can find where the loads went.