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zero values for moments in patran

zero values for moments in patran

RE: zero values for moments in patran

You're directly applying moments to grid points associated to CTETRA (solid) elements without the use of rigids (RBE2/RBE3) elements.

Its natural that nastran generates zero internal moments for these load-cases that explicitly have moments applied.

RE: zero values for moments in patran

solid elements don't carry rotational load. meaning they will never transfer 456 degrees of freedoms.
that's why when you apply axial to those solid element nodes, you can "stress" your FEA model. however when you apply moments directly at the nodes, your solid element is helpless to support it, that's why you can't transfer those applied loads.

only way is as nlgyro mentioned. by attaching RBE2/RBE3 elements and applying this moment to an free node of this RBE, you can have moment arms (RBE arms) - and this will "induce" translational loads from your moment loads applied to the "central" nodes of your RBEs.

Spaceship!!
Aerospace Engineer, M.Sc. / Aircraft Stress Engineer

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