Thin walled pressure vessel with external force

[SteelDirigibl]

Homework Statement

Homework Equations

σ=pr/t (hoop)

σ=pr/2t (longitudinal)

τ=VQ/It

The Attempt at a Solution

I have longitudinal stress and hoop stress. I'm trying to find shear stress, which should come only as a result of the 40kN from the collar correct? I'm confused with how I can get this on the pressure vessel. Would it be the same as if it were a simple rod?

 

[OldEngr63]

Are you sure you want to use tau = VQ/It? Think again about this.

What sort of stress does the external load create in the pressure vessel?

 

[SteelDirigibl]

It has to be shear stress doesn't it? The gage pressure doesn't cause any shear stress, right?

Does it cause another kind of stress too? Or am I just wrong? Can I get a multiple choice?