Regarding section forces and stress in a model

[Sakthiiitm]

I have modelled a K-cross frame using S4R shell elements, image of this is attached in this message. The diagonal members in the cross-frames are angle members. Now if I have want to see the normal stresses in the diagonal members can I take SF1 of the elements and divide by thickness?? Will it give me the normal stress??
1) What will the coordinate axis for the eleemnts in the diagonal axis as each diagonal will have different longitudinal axis?
2) If I want normal stress should I take SF1 or SF2 and divide by thickness

Could anyone please help me with this

 

[FEA way]

Results such as section forces and stresses in shells are always in local directions. Those directions are determined by the projection of the global coordinate system to the surface of the shell. There are certain rules governing that described in the documentation chapter Abaqus Introduction & Spatial Modeling --> Conventions --> Local Tangent Directions on Surfaces in Space.

You can use results transformation to transform such field outputs to a user-defined coordinate system.

 

[Sakthiiitm]

Thank you