# Stress Determination in thin wall cylinder

1. Aug 20, 2015

### scootypuffsnr

hi, i was wondering if a thin walled cylinder was storing water, where the pressure is dependent on the depth of water, how would you calculate the stress in the wall at some depth,
eg are you allowed to use the thin walled pressure vessel stress formula: stress = pd/2t and use the water pressure at that depth?

Thank you

2. Aug 20, 2015

### Nidum

Yes that's ok for a vertical axis storage tank holding still water .

Last edited: Aug 20, 2015
3. Aug 20, 2015

### scootypuffsnr

thank you so much for the reply,
what do you mean for the vertical axis? if the cylinder was inclined at the bottom of the cylinder would you not be able to apply the same equation
and also do you know how would you include frictional forces if it was acting at the same time in the stress calculations

4. Aug 20, 2015

### Nidum

I don't understand where your frictional forces have come from .

Describe what you are doing in more detail and/or send a diagram ?

5. Aug 20, 2015

### scootypuffsnr

im actually analyzing a silo structure storing bulk material to analyze the stress concentrations near the bolt holes so it would have pressures and frictional forces on the walls but just thought cylinder with water would be easier to describe

6. Aug 20, 2015

### Staff: Mentor

This would be a very good approximation but it would not be exact because of the variation of stress (and hoop strain) with depth.

Chet