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Bending stress is calculated as My/I where M is the moment at the cross section, y is the distance to the neutral axis, and I is the section inertia. All else equal, the section inertia is all that sets the two apart.
The lower the stress the better. Since Inertia is on the bottom of this equation, the greater the inertia, the lower the stresses, the better the beam is in bending.
I'm not going to calculate the inertias but by looking at them they are going to be very close.
This is not accounting for buckling, which may be the more concerning failure mode.
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Last edited by Schumi; 01-30-2009 at 10:48 AM..
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