MIL-PRF-46187A
SOCIETY OF AUTOMOTIVE ENGINEERS, INC. (SAE)
AMS 3892/7
Tow or Yarn, Carbon Fibers For Structural Composites GF
(OX) 400 (2758) Tensile Strength, 33 (228) Tensile
Modulus
(Application for copies should be addressed to the Society
of
Automotive
Engineers, 400 Commonwealth Drive, Warrendale, PA 15096.)
2.4 Order of precedence. In the event of a conflict between the text of this
document and the references cited herein, the text of this document takes
precedence. Nothing in this document, however, supersedes applicable laws and
regulations unless a specific exemption has been obtained.
3.
REQUIREMENTS
3.1 First article. When specified in the contract or purchase order, a sample
shall be subjected to first article inspection (see 4.2.1 and 6.2).
3.2 High temperature resin. The organic resin either thermoset or thermoplastic
shall withstand temperatures up to and including 316°C (600°F) while still
retaining required mechanical, chemical and physical properties.
3.3
Fiber.
3.3.1 Fiber physical properties. The carbon fibers used in the prepreg shall
conform to the minimum physical property requirements of AMS 3892/7 or equivalent
with any deviations approved by the procuring activity. Both PAN-base and pitch-
base carbon fibers shall be acceptable provided requirements of this
specification are met.
3.3.2
Fiber test methods.
The ASTM standards D3800, D4018 and D4102 (or
approved alternates) shall be used for determining the properties of carbon
fibers as specified in AMS 3892/7. Alternate sampling plans and test methods, as
agreed upon, shall be used by the fiber supplier in lieu of AMS 3892/7 sampling
plans and test methods.
3.3.3
Fiber sizing.
Fiber sizing (or finish) shall be compatible with high
temperature resin as specified in the contract or purchase order.
3.4
Prepreg.
The chemical and physical properties of the carbon fiber/high
temperature resin unidirectional prepreg shall be furnished by the contractor.
3.5
Composite laminates.
3.5.1
Physical properties.
Carbon fiber/high temperature
resin
composite
physical properties shall be furnished by the contractor.
3.5.2 Mechanical properties. Cured laminate test specimens for determination of
mechanical properties shall be ultrasonically "C" scanned prior to mechanical
testing.
Military Handbook 728/6 is a useful guide to ultrasonic testing.
Carbon fiber/high temperature resin composite laminates shall conform to the
requirements of table I and table II.
3.6 Shelf life. The product shall meet the requirements of this specification
when tested at any time up to 6 months from the date of shipment provided the
material has been stored in a heat-sealed vapor barrier bag compatible with
thermoplastic or uncured thermoset materials at manufacturer recommended
temperatures.
3.7 Prepreg workmanship criteria. The prepreg material shall have a maximum gap
width of 0.030 inches. The maximum continuous gap length shall not exceed one
3
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