Comparison of lightning protection performance of carbon/epoxy laminates with a non-metallic outer layer

Juhyeong Lee*, Thomas E. Lacy, Charles U. Pittman, Michael S. Mazzola

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

6 Citations (Scopus)
175 Downloads (Pure)

Abstract

This study shows how a lightning protection layer can be designed to effectively mitigate lightning damage in underlying composite structures. A parametric study was performed to characterize critical lightning protection layer properties that improve composite lightning damage resistance. Simulated 50 kA and 200 kA lightning strikes to pitch-based carbon fiber paper (PCFP)-protected AS4/3506 carbon/epoxy composites were considered in this study. The lightning protection characteristics of various PCFP outer layers were assessed by varying in-plane and through-thickness properties: electrical and thermal conductivities, and electrical and thermal gap conductances. The predicted matrix decomposition in the outermost AS4/3506 ply was significantly reduced by increasing the PCFP in-plane electrical conductivity. While predicted lightning damage decreased slightly with a decrease in thermal gap conductance, varying the electrical gap conductance and the in-plane and through-thickness thermal conductivities did not significantly affect the damage development. Among various PCFP properties, the PCFP in-plane electrical conductivity was the most critical factor in reducing thermal damage development (thus, protecting the underlying AS4/3506 laminate). This parametric study demonstrates that it may be possible to tailor lightweight non-metallic lightning protection layers as an effective alternative to traditional metallic projection layers.

Original languageEnglish
Pages (from-to)301-313
Number of pages13
JournalJournal of Reinforced Plastics and Composites
Volume38
Issue number7
Early online date8 Dec 2018
DOIs
Publication statusPublished - 1 Apr 2019

Keywords

  • finite element parametric study
  • Lightning damage prediction
  • non-metallic lightning protection system

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