FBD elemental system

AM_20700

I'm trying to calculate hot spot stress via FBD. I'm need to sum the direct nodal stress and the secondary stress (resulting from moments) in a specific direction.
But my nodes follow a curved path, so the relevant moment axis changes.
For example, I want to sum the nodal forces (in red) and the nodal moments that create forces along the same direction. For a portion of the path, it's the Y-moment (in green) and then it transitions to the Z-moment (blue).

When I export the FBD nodal forces and moments via a table, I can't extract the relevant moment.
Is there a way to have the FBD system track the elemental system at each node?
Is there a way to set a user system that is normal to the element edge at every element?

Community-Pasted-Attachment-1686790529235.png

Jason_Craanen

Hello,

The FBD system is not relevant to the elements but to their nodes (as we are talking here about Grid Point Forces), thus, the analysis system is the nodal analysis one (or displacement system).

 

With this in mind, I’d suggest setting the model assigning to the nodes on the curvature either local systems or at least a cylindrical one.