MIL-DTL-46027K(MR)
ASTM G47
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Standard Test Method for Determining Susceptibility to
Stress-Corrosion Cracking of 2XXX and 7XXX Aluminum
Alloy Products (DoD adopted)
(Copies of these documents are available from www.astm.org or ASTM International,
100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959.)
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 (see 6.2) first article
testing shall be required and all test samples required by this specification shall be made
available to the contracting officer or his authorized representative for approval in
accordance with 4.3. First article testing shall be completed before production material is
submitted for acceptance testing. The approval of the first article samples authorizes
commencement of production but does not relieve the supplier of the responsibility to
comply with all the applicable provisions of this specification. The first article samples
and acceptance test plates shall be manufactured by the process proposed for use on
production items.
3.2 Chemical composition. The chemical composition of the plates shall be within the
limits shown in Table I. The limits specified in Table I were taken from ASTM B209. A
certification of conformance of the chemical composition of the alloy shall be furnished
with the ballistic test plates.
3.3 Mechanical properties. Unless otherwise specified in the contract or purchase order
(see 6.2 and 6.3), the mechanical properties of the test specimen taken in the longitudinal
direction shall meet the minimum mechanical properties listed in Table II. If mechanical
property requirements differ from those contained in Table II, or if any other properties
are required, the ballistic requirements shall be negotiated between the procuring activity
and the supplier.
3.4 Ballistic limit. The protection ballistic limit, BL(P), shall be as specified in
Appendix A. No ballistic limit shall be specified for plate thickness of 0.250 to 0.499
inch, inclusive. When a complete penetration can not be obtained for any class of armor
material, the following rule shall be in effect until a new ballistic acceptance round can be
developed and utilized. When the ballistic velocities of four (4) partial penetrations are
above the minimum ballistic requirement for the specific thickness, the material shall be
certified as acceptable with a V50 (which obviously can not be explicitly determined)
above the minimum requirement.
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