Quote:
Originally Posted by GeeTwo
For most deflection and torsional loading (including buckling), the stiffness depends on the moment of inertia of the cross section, which, for a given amount of material, increases as the square of the distance from the center. For a given amount of material and diameter, a hollow round tube will have the greatest moment of inertia (be strongest), with a hollow square tube being a little bit behind. Shapes like I-beams and rectangular tubes are designed to have a larger moment of inertia in one dimension (the longer dimension) than another to accommodate a larger load in that direction.
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Can you be a little more clear? Which has less deflection, the tubing or the extrusion?