Re: [ATM] Polar moment of inertia for a square tube?

[fabio@voreas.com]

Go to http://www.efunda.com/math/areas/rectangle.cfm
and make the rectangle dimensions equal to give you a square. Scroll down 
until you see the table with all the useful properties. 

Fabio 

Tom Krajci writes: 

> For twisting/torsion I need to know the polar moment of inertia of a square
> tube, but I can't find it.  I can find the formula for a round tube:
> http://physics.uwstout.edu/StatStr/Strength/Torsion/tors62.htm 
> 
> Can someone point me to a formula for polar moment of inertia for a square
> tube? 
> 
> Thanks in advance, 
> 
> Tom Krajci
> Cloudcroft, New Mexico
> http://overton2.tamu.edu/aset/krajci/ 
> 
>  
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