Zick 2

[heaterguy]

What is the difference between Tangential shear stress and cicumferential stress?

 

[JStephen]

Circumferential stress is hoop stress, that is, tension or compression in a tangential direction.

Tangential shear stress would be a shearing stress in the same direction.

If you take a hollow cylinder and twist the two ends, you get tangential shear stresses in the walls.

If you take a hollow cylinder and apply air pressure, you get circumferential stress (and some longitudinal stress as well).

 

[pennpoint]

JStephen

If hoop stress is tangential, what is radial stress?

Just a question

pennpoint

 

[DSB123]

pennpoint,
The name gives it away. It's radial. i.e. if a vessel is under a pressure P then the radial stress at the innner surface is -P and the radial stress at the outer surface is zero. So the Radial Stress varies between -P and zero.

 

[heaterguy]

We have tangential shear stress, cicumferential stress, hoop stress, and radial stress. That's a lot of stress. Which of the above names mean the same thing?

 

[JoeTank]

Circumferencial stress comes from TWO sources... circumferential hoop stress and circumferential bending stress (P/A + Mc/I), both of which are present at the saddle. Tangential shear stresses are present too. Wow, that's a busy place!

Steve Braune
Tank Industry Consultants

http://www.tankindustry.com