Aluminum alloy for plate under vacuum
Aluminum alloy for plate under vacuum
(OP)
Hi there,
I am looking for an aluminium alloy with a high yield strength for an end plate for a vacuum chamber (it has to take 1 bar - 14.5 psi)
The outer diameter is 2500mm (8.2 ft)
The thickness is what I am trying to determinate (between 50 and 25mm / 1 inch-0.5 inch)
What alloy would you recommend?
We have some experience with type 5754 but for thick plates the yield strength is not so attractive
thanks
I am looking for an aluminium alloy with a high yield strength for an end plate for a vacuum chamber (it has to take 1 bar - 14.5 psi)
The outer diameter is 2500mm (8.2 ft)
The thickness is what I am trying to determinate (between 50 and 25mm / 1 inch-0.5 inch)
What alloy would you recommend?
We have some experience with type 5754 but for thick plates the yield strength is not so attractive
thanks
RE: Aluminum alloy for plate under vacuum
RE: Aluminum alloy for plate under vacuum
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Aluminum alloy for plate under vacuum
RE: Aluminum alloy for plate under vacuum
Does this pressure bulkhead have-to-be dead-flat... or can it be dome shaped?
Welded or Bolted/gasketed [permanently fixed]... or movable [door]?
Solid/monolithic... or machined-out [waffle/grid integral stiffeners].
Interior temperature: Room, Cryogenic, Hot? Chemicals or metals exposure?
Method of analysis? Safety factors? Material and Rigidity of the attached vacuum pressure vessel?
Fail-safe-mechanism for returning to ambient pressure?
WHY ALUMINUM????
Etc.
Regards, Wil Taylor
o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation,Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", Homebuiltairplanes.com forum]
RE: Aluminum alloy for plate under vacuum
the 6061-T6 seems a good candidate 275 MPa - 40 ksi yield strength
1 inch would have a maximum stress of 145 MPa - 21 ksi
The radial ribs is an option; we want to use thin windows for particles (high particle particles, they need a clean path) to go through
We are considering making a carbon fiber dome-shaped cap. This would decrease dramatically the stresses (hoop stress)
RE: Aluminum alloy for plate under vacuum
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Aluminum alloy for plate under vacuum
RE: Aluminum alloy for plate under vacuum
________________________________________
Mitsubishi Chemical Advanced Materials
www.mcam.com
RE: Aluminum alloy for plate under vacuum
RE: Aluminum alloy for plate under vacuum
A higher strength aluminum helps of course but the bulging will be the same (i.e., obvious and concerning to a bystander!) since it depends on elastic modulus.
Back to the drawing board, which should be the only flat thing in your project.
"Everyone is entitled to their own opinions, but they are not entitled to their own facts."