NDLI: Design guidelines for shielding effectiveness, current carrying capability, and the enhancement of conductivity of composite materials

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Design guidelines for shielding effectiveness, current carrying capability, and the enhancement of conductivity of composite materials

Content Provider	NASA Technical Reports Server (NTRS)
Author	Evans, R. W.
Copyright Year	1997
Description	These 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.
File Size	2448847
Page Count	72
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19970036055
Archival Resource Key	ark:/13960/t9s22x37r
Language	English
Publisher Date	1997-08-01
Access Restriction	Open
Subject Keyword	Spacecraft Design, Testing And Performance Electrostatic Shielding Electrical Resistivity Aerospace Environments Radio Frequency Shielding Lightning Electromagnetic Compatibility Graphite-epoxy Composites Protection Electrical Faults Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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