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Shielding and Conductivity of Composite Materials

PREFACE

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 composite materials. These guidelines concentrate on the
composites that are somewhat conductive but may require enhancement to
be adequate for EMC purposes. These composites primarily consist of
graphite reinforced polymers.

An introduction to resistivity, conductivity, and intrinsic
impedance of materials is included for informational purposes. This
information is useful for determining characteristics of various types
of composite materials and their shielding, current carrying, and
lightning protection capabilities.

Methods for determining adequate conductivity levels for various
EMC purposes are defined, and methods of increasing conductivity of
composite materials and joints are described.

Funding for this study was provided by the Space Environments
and Effects (SEE) Program administered by NASA MSFC’s Electromagnetics
and Aerospace Environments Branch through Contract NAS8—39983.

Mr. Steven Pearson was the technical monitor for this contract.
He was assisted by Mr. Matthew McCollum. Mr. Tony Clark reviewed
certain sections of the report and provided supporting theory. From
Tec—Masters, Inc , Mr. Dennis Camp was the Senior Engineer, and Ms.
Marla Luttrell proofread documents and provided publication advice.
Mr. Ross Evans, Tec—Masters, Inc., was the Principal Investigator who

performed the contracted effort of this program.