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Unformatted text preview: 0. Finally, Example 6.2 assumes that there is no axial stress due to the pressure. This is unusual, but it is physically possible, for example if the pressure vessel is a torus. 4. The three principal stresses are (30, 40, 50) Mpa, and the yield stress for a ductile material is 100Mpa. Derive or find (another textbook, internet) the equation for the 3D VonMises criterion and use it to calculate the safety factor. Compare to the safety factor you get from the Tresca criterion....
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 Fall '09
 Kim

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