Burst disc calculation help

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BigBang J
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Wed Jul 20, 2011 8:58 pm

Hey guys,

I know I've seen this on here somewhere bu I can't seem to find it.

How do you go about calculating the thickness of your burst disc to go with your burst pressure rating?

Thanks.
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DYI
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Wed Jul 20, 2011 9:59 pm

Find a simplistic shear strength relationship for the thickness, diameter and pressure, then do some tests to approximate the effective shear strength in this situation. It ends up being linear, and is reasonably close in most cases. Due to the varying compositions and of aluminum foil, there will be at least some testing involved to generate useful numbers.
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jackssmirkingrevenge
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Wed Jul 20, 2011 10:15 pm

It's fairly easy to do some practical testing, if you need moar pressure, moar layers!
hectmarr wrote:You have to make many weapons, because this field is long and short life
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Gippeto
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Thu Jul 21, 2011 12:17 am

This might be of some help if the trial and error method doesn't appeal to you. :)

http://www.ansys.com/staticassets/ANSYS ... nf-227.pdf
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jackssmirkingrevenge
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Thu Jul 21, 2011 12:19 am

Gippeto wrote:This might be of some help if the trial and error method doesn't appeal to you. :)
If this is the case, what sort of a spudder are you :shock:

:D :D :D
hectmarr wrote:You have to make many weapons, because this field is long and short life
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Gippeto
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Thu Jul 21, 2011 12:23 am

jackssmirkingrevenge wrote:
Gippeto wrote:This might be of some help if the trial and error method doesn't appeal to you. :)
If this is the case, what sort of a spudder are you :shock:

:D :D :D
One with VERY FEW "fails". :wink: :lol:
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jackssmirkingrevenge
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Thu Jul 21, 2011 12:46 am

Gippeto wrote:One with VERY FEW "fails". :wink: :lol:
touché

:P :wink:
hectmarr wrote:You have to make many weapons, because this field is long and short life
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whoa044
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Tue Sep 13, 2011 4:33 pm

I have 40 Gauge copper sheets that I use as discs in my pneumatic HPA gun.

I have a 1/2" union, although the actual diameter of the disc that is open to air pressure is about 0.8" (I punch out 1 1/4" discs). They burst at 370-380 psi.
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