Thin walled pressure vessel with external force

AI Thread Summary
The discussion revolves around calculating shear stress in a thin-walled pressure vessel subjected to an external force. The participant has already determined longitudinal and hoop stresses but is uncertain about deriving shear stress from the external load of 40kN. There is confusion about whether the external load induces shear stress and if it behaves similarly to a simple rod. Participants clarify that while gauge pressure does not create shear stress, the external load does contribute to it. The conversation emphasizes the need to understand the types of stresses involved in pressure vessels under external forces.
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Homework Statement



attachment.php?attachmentid=46420&stc=1&d=1334881609.png



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?
 

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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?
 
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? :smile:
 

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