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Anybody help with these questions?

  1. Sep 15, 2010 #1
    Anybody help with these questions???

    1. The problem statement, all variables and given/known data

    A spherical pressure vessel has been designed such that the tensile stresses in its walls should not exceed 150MPa. The ratio of the vessels radius to wall thickness is 100. Applying a thin-walled plane stress assumption, what is the maximum uniform internal pressure that the vessel is intended to contain???

    2. Relevant equations

    Thin walled pressure cylinder assumption P= sigma(s) x radius/2xt(s)

    3. The attempt at a solution
    i tried the answer 0.15MPa but not sure if its right can anyone help me??
     
  2. jcsd
  3. Sep 15, 2010 #2

    rock.freak667

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    Re: Anybody help with these questions???

    Your equation should read σ= (Pr)/t or P = σt/r
     
  4. Sep 16, 2010 #3
    Re: Anybody help with these questions???

    Hi how do you denote the radius to wall thickness, is it 100 to 1 or 10 to 0.1???
    Many thanks
    Stevo
     
  5. Sep 16, 2010 #4

    rock.freak667

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    Re: Anybody help with these questions???

    since r is the radius and t is the wall thickness

    radius to wall ratio = 100 OR r/t = 100.
     
  6. Sep 16, 2010 #5

    nvn

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    Good advice by rock.freak667, except the equation should be sigma = p*r/(2*t).
     
  7. Sep 17, 2010 #6

    rock.freak667

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    Re: Anybody help with these questions???

    Yes it should, I was thinking about a thin-walled cylinder.
     
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