Moment of Inertia for hollow circle sector
Moment of Inertia for hollow circle sector
(OP)
I am trying to calculate the moment of inertia for a 'sector of hollow circle'. I have found the formula in Roarks formulas for stress and strain page 808. This formula works out but my problem has parallel slots(which do not pass through the centerline)that are 0.188" either side. Can anyone help with what I should do or point me in the right direction showing where the formula can be found.
I have attached a screen dump of the problem that I have.
Thanks
Phil
I have attached a screen dump of the problem that I have.
Thanks
Phil






RE: Moment of Inertia for hollow circle sector
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Moment of Inertia for hollow circle sector
RE: Moment of Inertia for hollow circle sector
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Moment of Inertia for hollow circle sector
The formula for the hollow circle sector can be found in CISC Handbook of Steel Construction, eighth edition, page 7-62. Then apply two negative rectangular areas of 0.188 x t where t is the thickness of the section. Subtract the slots as Ron suggested. It's a bit messy, but easily done.
There are other approximate methods which are probably close enough for your purposes.
BA
RE: Moment of Inertia for hollow circle sector
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Moment of Inertia for hollow circle sector
This is easily done in AutoCAD using MASSPROP command. As you can see from the attachment Ix=0.0058in^4 and Iy=0.0740in^4.
IV
RE: Moment of Inertia for hollow circle sector