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Re: Torsion Constants

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>Does anybody have any good references for calculating torsion constants
>for multi-celled shapes (such as extruded aluminium sections) and other
>unusual hollow sections?
Timoshenko's Stngth of Materials Book is my all around favorite general 
reference for multi-celled torsional constants every day for a living. 
There's some specific information in Blodgett's books. In general (thick 
walls, small holes, you need to get fairly elegant. I've used FEA to to 
it, and once upon a time I ran into a program called BEAMSTRESS which had 
a built-in FEA routine for the job. 

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