311 Ch20

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311 Ch20

  1. 1. <ul><li>XI.) Stresses in Thin-Walled Pressure Vessels </li></ul><ul><li>A.) The following formulas are valid only if the wall thickness-to-radius ratio is small enough, i.e. : </li></ul><ul><li> t_ < 0.10 </li></ul><ul><li> r i </li></ul><ul><li>or, based on diameter: </li></ul><ul><li>t_ < 0.05 so, t < 0.05 D i </li></ul><ul><li>D i </li></ul>
  2. 2. <ul><li>Circumferential Stress (hoop stress): </li></ul><ul><li>  t,c = pD i </li></ul><ul><li> 2t </li></ul><ul><li>Longitudinal Stress (also applies to spheres): </li></ul><ul><li>  t,L = pD i </li></ul><ul><li> 4t </li></ul><ul><li>D i = Inside Diameter (in.) </li></ul><ul><li>p = Internal Pressure (psi) </li></ul><ul><li>t = wall thickness (in) </li></ul>

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