Downloaded from https://www.everyspec.com MIL-STD-2031(SH) 4.2.2 Procedures. Organizations having a composi[e malerial syslem application not previously approved by the Naval Sea Systems Command shall initiate the qualification procedure through direct cnntacl or via a Ie[ter rcques! to the Non-metallic Materials Branch. The request should inclucie information on the planncci composite mater)al system applmlion, chemical composition information, and bcmcfits of the composite material system application. The application will be reviewed by the cognizant engineering group in NAVSEA.
If the proposed request has merit, written qualification proccdurc guidance for fit-c testing will lhcn be provided to the initiating organization. The results obtained from the tests conducted according to the methods of paragraph 4.1 will be used in performing a risk/benefit analysis inherent in the development of any new equipment and sptem. V/hen the analysis is complete the requesting official will be notified of the acceptance or use category for the proposed application. 4.23 Data package. All test data and obsewatiorts resulting from tests conducted by methods given in paragraph 4.1, shall be submitted to the Naval Sea Systems Command (see 6.3). 4.2.4 Certification for use.
Test data and obsemations from these test methods and other information submitted to the Naval Sea Systems Command in support of the qualification procedure will be used in certifying a composite material system for the proposed application. The Naval Sea Systems ~mmand will certify a composite material system prohibited and not permitted for any submarine application when wnrranted by the t=t data or ana!yses. The Naval Sea Systems ~mmand W-l}certi~ the composite material system is fit for use in specific limited applications based on test results and safety analysis.
Composite material systems currently used in naval submarines are exempt from this qualification procedure for that s~ific application. 5. DETAILED REQUIREMENTS 5.1 Test rtspondbility. Unless othmwise specif~ (see 6.2), the supplier of the application item to the Navy shall be responsible for submitting the required data and information resuhing from the teats required and requesting certification of the composite system for that application. The government resetvts the right to perform independent tests where deemed necessary to ensure conformance with the prescribed requirements. 5.2 Specimen rquimnents.
Unless othewise specified by NAVSEA the specimen thickness shall be the minimum thickness intented for use of the composite material or as a composite material sptem. The minimum thickness of a compxite material system permitted by this standard is 1/8 inch (3.18 mm). Material system characteristics shall be preserved when shape must be changed to fit into test apparatus. As a minimum, material characteristics to be preserved are chemical composition, geometric relationships between constituent materials in a composite layer, and stacking sequence for layers within the buik structure, and coatings, cladding or additives, if appropriate.
Edges which are not exposed in sewice shall be protected during testing when possible. To avoid the need for additional testing, test specimens shall be representative of any expected variations in the manufacturing process. 6