4.3Beryllium Structures

A beryllium structure is any structure fabricated from materials that have a beryllium content of greater than 4 percent by weight as defined in NASA-STD-6016, Standard Materials and Processes Requirements for Spacecraft.

4.3.1

[FSR 46] The minimum design and test factors of safety for beryllium structures shall be as specified in Table 7, Minimum Design and Test Factors for Beryllium Structures.

Table 7—Minimum Design and Test Factors for Beryllium Structures

For beryllium structures, each flight article has to be proof tested unless the requirements of section 4.6 are met.

In addition to the design and test factors specified in Table 7, the requirements given in sections 4.3.2 to 4.3.5 are also to be satisfied when using beryllium as a structural material.

4.3.2

[FSR 47] When using cross-rolled sheet, the design shall preclude out-of-plane loads and displacements during assembly, testing, or service life.

4.3.3

[FSR 48] Stress analysis shall properly account for the lack of ductility of the material by rigorous treatment of applied loads, boundary conditions, assembly stresses, stress concentrations, thermal cycling, possible material anisotropy, and worst-case tolerance conditions.

4.3.4

[FSR 49] All machined and/or mechanically disturbed surfaces shall be chemically milled to ensure removal of surface damage and residual stresses.

4.3.5

[FSR 50] All parts shall undergo penetrant inspection for surface cracks and crack-like flaws per NASA-STD-6016, Standard Materials and Processes Requirements for Spacecraft.