I know these two
MI for Solid Round Beams = (pi * (OD4 - ID4)) / 64
Deflection = (length^3 * force) / (3 * E * MI)
where
MI = Moment of Inertia
E = Modulas of Elasticity in psi

But two different Youngs Modulus figures given for this tube!
Youngs Modulus 0°(GPa)     90
Youngs Modulus 90°(GPa)   19
Which one to use?