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F.3.5.1
Alternative Materials may be used for applications shown as permitted in F.3.2.1
F.3.5.2
If any Alternative Materials are used, the SES must contain:
a. Documentation of material type, (purchase receipt, shipping document or letter of donation) and the material properties.
b. Calculations demonstrating equivalent to or better than the minimum requirements for steel tubing in the application as listed in F.3.4.1 for yield and ultimate strengths matching the Non Welded Steel properties from F.3.4.2.a above in bending, buckling and tension, for buckling modulus and for energy dissipation.
F.3.5.3 Aluminum Tubing
a. Minimum Wall Thickness for Aluminum Tubing: Non Welded 2.0 mm Welded 3.0 mm
b. Non Welded properties for aluminum alloy 6061-T6 for calculations in an SES must be: Young’s Modulus (E) = 69 GPa (10,000 ksi)
Yield Strength (Sy) = 240 MPa (34.8 ksi)
Ultimate Strength (Su) = 290 MPa (42.1 ksi)
c. Welded properties for aluminum alloy 6061-T6 for calculations in an SES must be: Yield Strength (Sy) = 115 MPa (16.7 ksi)
Ultimate Strength (Su) = 175 MPa (25.4 ksi)
d. If welding is used on a regulated aluminum structure, the equivalent yield strength must be considered in the “as welded” condition for the alloy used unless the team provides detailed proof that the frame or component has been properly solution heat treated, artificially aged, and not subject to heating during team manufacturing.
e. If aluminum was solution heat treated and age hardened to increase its strength after welding, the team must supply evidence as to how the process was performed.
This includes, but is not limited to, the heat treating facility used, the process applied, and the fixturing used.
F.3.5.4 Titanium and Magnesium Tubing
a. Minimum Wall Thickness for Titanium Tubing 1.2 mm
b. Minimum Wall Thickness for Magnesium Tubing 3.0 mm
c. Titanium or magnesium on which any welding has been utilized must not be used for any part of the Primary Structure.
Explanation
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