Pressure Vessels


by tone999
Tags: pressure, vessels
tone999
tone999 is offline
#1
Dec23-06, 04:02 PM
P: 18
1. The problem statement, all variables and given/known data
A cylinder has an internal diameter of 30mm and an external diameter of 50mm and is subject to an internal pressure which is 60MPa above that in the air surrounding the cylinder. Determine the radial and hoop stresses at the inner and outer surfaces.

2. Relevant equations
Basically i know:
internal radius in know as r1
external radius is r2

radial stress: pr1 squared/r2squared-r1squared X (r squared - r2 squared/ r squared)

hoop stresses : pr1 squared/r2squared-r1squared X (r squared + r2 squared/ r squared)

I dont know if these two equations are correct hopefully somebody could clarify this for me because the working out should be simple when this is known.

3. The attempt at a solution
I dont know what "r" is?
If i knew that i could take a stab at the equations hopefully somebody could give me two answers and if the equations are correct and two answers and i will do it myself to check this. Thanks
1. The problem statement, all variables and given/known data



2. Relevant equations



3. The attempt at a solution
Phys.Org News Partner Science news on Phys.org
Cougars' diverse diet helped them survive the Pleistocene mass extinction
Cyber risks can cause disruption on scale of 2008 crisis, study says
Mantis shrimp stronger than airplanes
ShawnD
ShawnD is offline
#2
Dec24-06, 10:14 AM
Sci Advisor
ShawnD's Avatar
P: 988
Quote Quote by tone999 View Post
I dont know what "r" is?
Radius is half the diameter, which would be 15mm and 25mm. I don't know if your formula is correct but make sure you keep the units consistent; I think MPa requires that you work in meters (m), not milimeters (mm).
tone999
tone999 is offline
#3
Dec24-06, 01:39 PM
P: 18
Yeah ive got that. I mean "r" on its own in the equation. I know the values for r1 - 0.015m
r2 - 0.025m
Internal pressure - 60x10 to the power of 6 Nm2


Register to reply

Related Discussions
Blood Vessels... do they NOT follow Bernoulli's principle? General Physics 16
Conceptual Pressure Question: Fluid Pressure in a U-Tube Introductory Physics Homework 1
Physics of blood vessels General Physics 6
Neutron Embrittlement of Pressure Vessels Nuclear Engineering 1
Pressure vessels Mechanical Engineering 3