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Re: Torsional Constant

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>J is the polar moment of inertia of a
>section in "Roark's Formulas for Stress and Strain" -- is that also the
>definition of J used here?
The torsional constant is the torsional stiffness used in the formula for 
rotation under torsion, theta = TL/JG. It's not the polar moment of 
inertia for any section except a circle or annulus. for a thin plate the 
value is (Width)(thickness)^3/3 More info in Blodgett's books on design 
of welded structures.

Christopher Wright P.E.    |"They couldn't hit an elephant at
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)

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