Max Load before square tube deforms

  • Thread starter raionz
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Main Question or Discussion Point

My boss just told me to get him this today and the last time I took a mechanic class pluto was still a planet.

See diagram attached.
diagram.JPG


Both bulkhead A and arm are made of aluminum T6061 hollow tubes.
Arm is at center of A.

Assuming that arm will never break off from A, will the current load deform A? I vaguely remember max torsional moments is what I'm looking for but that doesn't take into account material strength.

Shear stress = load + weight of arm.

t=0.25"
b=6"

If max torsional moment is = (2/9) (tau max) (b^3)
tau max = 0.27 (V/t)[b^3-(b-2t)^3] / [b^4 - (b-2t)^4]

V = transverse shear force
is V = shear stress?

Where does material property come in? Please help. Thanks
 

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