] [Thread] [Date] [Author]

[Christopher Wright <chrisw(--nospam--at)skypoint.com>]

On Nov 23, 2009, at 6:29 PM, Liaquat Ally Akhand wrote:

> "J" is the polar moment of inertia.
For structural purposes J is the torsional stiffness. The polar  
moment of inertia is the torsional stiffness only for the special  
case of circular sections
> It is the square root of summation of square of moment of inertia
> about "x-axis" and "y-axis".
The polar moment of inertia is the sum of the cross-sectional moments  
of inertia, not the root-sum-square

> You can find it in any standard Handbook.
Blodgett is your best resource. It explains everything

Just so you'll know.

Christopher Wright P.E. |"They couldn't hit an elephant at
chrisw(--nospam--at)skypoint.com   | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania  
1864)
http://www.skypoint.com/members/chrisw/




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