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Determining Pressure Outside a Tube with Pressure Inside

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on4now4

Automotive
Nov 17, 2011
16
US
Hello all,

I am trying to figure out for a hydro-forming application how much pressure is actually passed through a tube into the tool. Granted if the part we are talking about has lots of varying part shape than things can get complicated very quickly. But if we look at just a straight round tube with a yield strength of 648 n/mm^2 and were to fill it with say 3000 Bar or 300 n/mm^2. Am I correct in thinking that the tool would actually not see any force at all from the pressure inside the tube because the yield strength is below the forming pressure being applied to the tube?

Is there a formula I can use to calculate how much pressure is being passed through the tubes wall onto the tool?

Where does wall thickness come into play? I would have to assume that a tube with a 1mm wall thickness would pass more pressure onto the tool than a tube with a 10mm wall thickness even if they both were to have the same yield strength.

Please correct me if anything I just stated is incorrect or if I am misunderstanding some simple concept.

Thank you for any help
 
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