Stresses over a pipe cross section

[VigAbaqusNoob]

Hi,

I have a cylinder model where I calculated the axial stress distribution over the cylinder wall using FE analysis and now need to convert these stresses into membrane and bending stresses acting over the cross section. I did linearize the through wall stresses to obtain the membrane and bending stresses acting on the wall. My supervisor said these are not the stresses acting on the cross section, which kind of puzzles me. Could someone please help me understand this ?

Thanks

 

[Doug Hunter]

Please add a diagram to help visualize. Did your FE method only calculate stresses at the surfaces and not those acting through the full thickness of the material? Bending stresses are not so much a unique type of stress but rather a "profile" or "pattern" of tensile/compressive stresses that are induced through a cross-section of a structure when it is loaded with bending moments which induce bending deflections.