Sae Rules

B3.26 Monocoque General Requirements
All equivalency calculations must prove equivalency relative to steel grade SAE/AISI 1010.
B3.26.1 All sections of the rules apply to monocoque structures except for the following sections which supplement or supersede other rule sections.
B3.26.2 Monocoque construction requires an approved Structural Equivalency Spreadsheet, per Section B3.8. The formmust demonstrate that the design is equivalent to a welded frame in terms of energy dissipation, yield and ultimate strengths in bending, buckling and tension. Information must include: material type(s), cloth weights, resin type, fiber orientation, number of layers, core material, and lay-up technique. The 3 point bend test and shear test data and pictures must also be included as per B3.28Monocoque Laminate Testing. The Structural Equivalency must address each of the items below. Data from the laminate testing results must be used as the basis for any strength or stiffness calculations.
B3.26.3 Composite and metallic monocoques have the same requirements.
B3.26.4 Composite monocoques must meet the materials requirements in Rule B3.7 Composite Materials.
B3.27 Monocoque BucklingModulus – Equivalent Flat Panel Calculation
When specified in the rules, the EI of the monocoque must be calculated as the EI of a flat panel with the same composition as the monocoque about the neutral axis of the laminate. The curvature of the panel and geometric cross section of the monocoque must be ignored for these calculations.
Note: Calculations of EI that do not reference B3.27 may takeinto account the actual geometry of the monocoque.

B3.28 Monocoque Laminate Testing
Teams must build a representative section of the monocoque side impact zone (defined in B3.31) side as a flat panel and perform a 3 point bending test on this panel. They must prove by physical test that a section 200mm (7.9 inches) x 500 mm (19.7 inches) has at least the same properties as a baseline steelside impact tube (See B3.3.1 “Baseline Steel Materials”) for bending stiffness and two side impact tubes for yield and ultimate strength. The data from these tests and pictures of the test samples must be included in the SES. The test specimen must be presented at technical inspection. If the test specimen does not meet these requirements then the monocoque side impact zone must be strengthenedappropriately.
Note: Teams are advised to make an equivalent test with the base line steel tubes such that any compliance in the test rig can be accounted for.
B3.29 Monocoque Front Bulkhead
See Rule B3.26 for general requirements that apply to all aspects of the monocoque. In addition when modeled as a flat plate the EI of the front bulkhead about both vertical and lateral axis must beequivalent to that of the tubes specified for the front bulkhead under B3.18. Furthermore any front bulkhead which supports the IA plate must have a perimeter shear strength equivalent to a 1.5 mm thick steel plate.
B3.30 Monocoque Front Bulkhead Support
B3.30.1 In addition to proving that the strength of the monocoque is adequate, the monocoque must have equivalent EI to the sum of the EI of the six(6) baseline steel tubes that it replaces.
B3.30.2 The EI of the vertical side of the front bulkhead support structure must be equivalent to at least the EI of one baseline steel tube that it replaces when calculated as per rule B3.27 Monocoque Buckling Modulus.
B3.30.3 The perimeter shear strength of the monocoque laminate in the front bulkhead support structure should be at least 4kN (880pounds) for a section with a diameter of 25 mm (1 inch). This must be proven by a physical test by measuring the force required to pull or push a 25mm (1 inch) diameter object through a sample of laminate and the results include in the SES
B3.31 Monocoque Side Impact
B3.31.1 In addition to proving that the strength of the monocoque is adequate, the side of the monocoque must have equivalent EI...