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Design Guidelines for Shielding Effectiveness, Current Carrying Capability, and the Enhancement of Conductivity of Composite MaterialsThese guidelines address the electrical properties of composite materials which may have an effect on electromagnetic compatibility (EMC). The main topics of the guidelines include the electrical shielding, fault current return, and lightning protection capabilities of graphite reinforced polymers, since they are somewhat conductive but may require enhancement to be adequate for EMC purposes. Shielding effectiveness depends heavily upon the conductivity of the material. Graphite epoxy can provide useful shielding against RF signals, but it is approximately 1,000 times more resistive than good conductive metals. The reduced shielding effectiveness is significant but is still useful in many cases. The primary concern is with gaps and seams in the material just as it is with metal. Current carrying capability of graphite epoxy is adequate for dissipation static charges, but fault currents through graphite epoxy may cause fire at the shorting contact and at joints. The effect of lightning on selected graphite epoxy material and mating surfaces is described, and protection methods are reviewed.
Document ID
19970036055
Document Type
Contractor Report (CR)
Authors
Evans, R. W. (Tec-Masters, Inc. Huntsville, AL United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1997
Subject Category
Spacecraft Design, Testing and Performance
Report/Patent Number
NAS 1.26:4784
M-837
NASA-CR-4784
Funding Number(s)
CONTRACT_GRANT: NAS8-39983
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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