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    Stuck on a failure theories question, I'm almost certain I need the torsion equation T/J = tau/radius = G*theta/L, but I'm not sure where everything fits in. Any help is greatly appreciated!
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    You know the Torque (it's given).

    You can work out J as you know the outer diameter of the vessel and are given the wall thickness, so can hence calculate the inner diameter.

    You know the radius to use as you know the point where the maximum stress will be.

    Tau is typically said to be 0.577 of sigma, but not sure if you could use that for this question.
 
 
 
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