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Re: Torsional constant J for a half round shape section
Re: Torsional constant J for a half round shape section -- marrosadi	Post Reply	Top of thread	Forum

Posted by: phatso86 ® 08/31/2007, 10:47:09 Author Profile eMail author Edit

its something u need to derive

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Re: Torsional constant J for a half round shape section
Re: Torsional constant J for a half round shape section -- marrosadi	Post Reply	Top of thread	Forum

Posted by: acroduster1 ® 06/10/2004, 13:55:02 Author Profile eMail author Edit

J for any shape is the surface integral of the density^2 over dA.  The problem is for the shape to twist on its own axis, this integral has to be taken about the centroid of the cross section.  That's where this integral gets ugly for a half-pipe shape.  You can do it by approximate methods using Excel, or just keep up your search to see if someone has listed a formula for it. If you post the dimensions of the half-pipe I can give it a go... Acro

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Correction to J formula
Re: Re: Torsional constant J for a half round shape section -- acroduster1	Post Reply	Top of thread	Forum

Posted by: acroduster1 ® 06/10/2004, 14:05:18 Author Profile eMail author Edit

I'm sorry, it's not the density^2 over dA, it's the radius to the infinitesimal^2 integrated over dA. Integral(r^2 dA) My apologies... Acro

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