The prediction model for resistance of composite interference-fit joint subjected to current strike

Composite interference-fit joints are widely used in aerospace due to their reliability and load-bearing capacity. However, they are vulnerable to lightning damage. This analyzes the prediction resistance model of a composite interference-fit joint subjected to a current strike, focusing on electrical conductivity. Analyzing various lightning strike stages, the study establishes analytical expressions for the initial resistance related to interference-fit size and structural dimensions before the lightning strike. Additionally, the dynamic resistance change after the lightning strike is investigated, considering the influence of the current waveform. Non-destructive tests are employed for verification and refinement. The findings reveal a correlation between the initial resistance and the interference-fit size in pre-strike stage, while both the interference-fit size and the peak current influence the equivalent resistance under low lightning current conditions. Notably, an intermediate interference-fit size provides a substantial protective gain for the composite connection. This approach eliminates the need for destructive tests and offers a dependable data reference for aircraft component assembly.