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Lightweight substitutes for machined aluminum parts

Bear in mind fiberglass is fatigue resistant (better than your aluminum!), but only if the part is designed with a factor of safety of 5. …
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Strength of a Vertical Round Aluminum Tube with load cantilevered off it?

Bending is $$M' = 0.72*\frac{Ert^2}{\sqrt{1-\nu}}$$ (Source is Roark's again, Table 15.2, Case 16) $\nu$ for aluminum is 0.35. … Therefore, the 2" aluminum tube is satisfactory for the given loads Now onto the additional notes: Should I consider High-Strength 2024 Aluminum with the same dimensions instead? …
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