MIL-M-8555C
3.6.11 Fibrous composite construction. The specific acceptance by the
acquiring activity of the use of fibrous-composite construction for missile
structures, and the acceptance of all contractor-prepared process
specifications for such construction shall be based on the demonstrated
suitability of construction when used in missile structures, which are in all
respects representatives of production design and construction, and are
subjected to the required operating environments. These requirements pertain
to all airframe structures which are required to sustain loads under take-off,
flight, landing, ground handling, and laboratory test conditions, and which,
if failed or excessively deformed, would cause uncontrollable motions of the
missiie within the flight envelope. Specific test and data requirements shall
be as specified in applicable contractual specifications. All reinforced
plastic construction, including laminates and sandwich, shall be in
conformance with the contractor's process specifications, prepared in
accordance with MIL-HDBK-23 and MIL-P-9400 and requires approval by the
acquiring activity. Each structure made of composites shall be bonded
(electrically, mechanically, etc) to the main structure (see 4.7.1).
3.6.12 Selection of the composite materials. The selection of the
materials to be used for structural applications shall take into account all
factors which affect required strength, rigidity, and structural reliability.
Such factors shall include, but are not limited to, manufacturing processes:
static, repeated, transient, vibratory, and shock loads; end specific effects
of operating environment associated with reduced and elevated temperatures,
repeated exposure to climatic, erosive, and scuffing conditions, the use of
protective finishes, the effects of stress concentrations, and the effects of
fatigue loads on composite endurance limit and ultimate strength. The actual
values of properties used for structural design shall include such effects.
Appropriate repair procedures shall be established for accepted applications
of fibrous-composite construction in missile structures for subsequent
incorporation in pertinent structural repair manuals.
3.6.13 Properties for structural design of composite materials. In
general, reliable materials with mechanical and physical properties suitable
for use in structural design of fibrous composites-shall be of the type which
would be obtained from MIL-HDBK-5 for the design of conventional counterpart
metallic structures consistent with the required operating environments, and
such properties shall be developed in accordance with procedures described in
MIL-HDBK-5. However, properties which are unique for fibrous composites, due
to their special characteristics associated with directionality of fibers and
construction variables, shall be included.
3.6.14 Missile skin.
The missile skin shall be approved by the acquiririg
activity (see 3.21).
3.6.15 Lubricants. Missile lubricants shall be selected and employed in
accordance with MIL-STD-838.
3.6.16 Recycled, virgin and reclaimed materials. There is no exclusion
to the use of recycled or reclaimed materials and no mandate for the use of
virgin materials provided it meets the requirements of this specification.
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