Accession Number:

AD0894118

Title:

Coatings for Lightning Protection of Structural Reinforced Plastics. Part 2

Descriptive Note:

Final rept. 15 Nov 1970-15 Nov 1971

Corporate Author:

BOEING CO RENTON WA COMMERCIAL AIRPLANE GROUP

Report Date:

1972-01-17

Pagination or Media Count:

81.0

Abstract:

Coatings and coating systems developed for protecting boron-filament- and graphite-fiber-reinforced epoxy composites from structural damage by lightning strikes were investigated and developed. These coatings are 6-mil- thick aluminum foil, 200 by 200 mesh aluminum wire fabric, 120 by 120 mesh aluminum wire fabric, and a coating containing aluminized glass filaments. These coatings all use a continuous-metal member as the protective element e.g., metal foil, woven wire fabric, or metallized glass filaments. Each of these was found capable of preventing mechanical damage to the composite at the 100-kA test level. Very local and minor damage was frequently, but not always, detected after 200-kA testing. None of the coatings could fully protect the composites from damage due to the high- coulomb component of the artificial lightning stroke. The coatings investigated were relatively unaffected by normal aircraft environments. Their electrodynamic properties were measured and assessed.

Subject Categories:

  • Coatings, Colorants and Finishes
  • Plastics
  • Safety Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE