Pressure rating of thick cylinder
Pressure rating of thick cylinder
(OP)
Hi,
I have been trying to figure out the pressure rating of a thick cylinder under pressure and ran into a few problems,
1) I have come across different criterias for distinction between thick and thin cylinders (i.e. Thin cylinder if D/t>10 or if t<r/10 or if r>5*t). So I went with the one that occured in most books including Roark's handbook which is t<r/10.
2) I calculated the Von Mises stress using Lame's equations (attached file). But the Von Mises using these equations does not match with the FEA simulated results with a difference of 11% (attached file showing boundary conditions).
So, the question is am I using the right approach (i.e. correct formulaes) and why do you think my analytical Von Mises stress value is so far from the FEA Von Mises stress value?
I have been trying to figure out the pressure rating of a thick cylinder under pressure and ran into a few problems,
1) I have come across different criterias for distinction between thick and thin cylinders (i.e. Thin cylinder if D/t>10 or if t<r/10 or if r>5*t). So I went with the one that occured in most books including Roark's handbook which is t<r/10.
2) I calculated the Von Mises stress using Lame's equations (attached file). But the Von Mises using these equations does not match with the FEA simulated results with a difference of 11% (attached file showing boundary conditions).
So, the question is am I using the right approach (i.e. correct formulaes) and why do you think my analytical Von Mises stress value is so far from the FEA Von Mises stress value?





RE: Pressure rating of thick cylinder
RE: Pressure rating of thick cylinder
If you have access to ASME B&PV Code books, I would review Section VIII, Div 1 for thickness formulas. Despite this being structural with pressure, the same concept and formulas would apply for internal or external pressurized cylindrical components (pressure vessels).
RE: Pressure rating of thick cylinder
gwolf
RE: Pressure rating of thick cylinder
RE: Pressure rating of thick cylinder
RE: Pressure rating of thick cylinder
corus
RE: Pressure rating of thick cylinder
corus