Stress forces on aluminum tubings

[mibiz1]

Hi,

Please forgive me if this post is in the wrong section. I'm interested in working on a project but my physics is very rusty in terms of calculating stress and in need of help. I would like to know which is better given the below aluminum 6061-T6 tubing with similar weights to withstand all stress forces axial, radial/torsional, sheer, tear, bend, etc... for an approximate tube length of about 60 inches:

2 inch outer diameter round tube with 0.083 wall thickness - cross sectional area of 0.500

versus

1.25 in outer square tube with 1.125 wall thickness - cross sectional area of 0.563

Thanks for your help.

 

[nvn]

mibiz1: Globally, the round tube listed in post 1 currently appears to be significantly stronger than the square tube listed in post 1.