Is Patran wrong in showing the results of the rotational displacement of the analytical model?

[Payaroshd]

I have met a three-dimensional model with Nastran Analysis.I used patran post proccesding for resualts.when I will appeardisplacement resualts to be true, but when it shows the rotational displacement in X,Y or Z directiin The results are cluttered and every elements has gone to a position.!and We do not see a continuous shape in fem model for the rotational displacements such as linear displacements.
I have experienced this again in analyzing different models, someone knows the reason.

 

[ESPcomposites]

This is expected if you request the rotation of the nodes. I believe you are confusing nodal displacements with nodal rotations.

For example, if you plot the nodal displacements, a portion of the part may appear to be rotated in physical space. However, the physical rotation is actually a set of nodal displacements. In other words, what we observe as "rotation" is actually just displacement at each point in the body. Rotation of each node is not something we would interpret in a physical manner.

Brian

http://www.espcomposites.com