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This paper presents coupled thermal-electrical analysis of transient temperature distribution in carbon fibre composites (CFRP) exposed to simulated lightning current to understand the damage behaviour due to lightening strike. Thermal and electrical properties of CFRP were evaluated for each direction of the unidirectional composites. The thermal decomposition behaviour was also estimated from thermo-gravimetric analysis results. Based on the experimental results and preliminary analysis results, the electrical and thermal boundary conditions were discussed in detail. The numerical results are directly compared with the experimental results, and the damage mechanisms of CFRP exposed to impulse current were considered. As a result, it was inferred that the delamination of CFRP was mainly caused by the decomposition of matrix resin, and the fibres were broken by the sublimation due to high Joule heat generation.

Coupled Thermal-Electrical Analysis for Carbon Fiber Composites Exposed to Simulated Lightning Current