A numerical study of the pressure applied on CFRP panels during a lightning strike using a coupled electro-thermal-mechanical model
Résumé
The damage generated as direct effect of a lightning strike on a composite panel is of primary interest in aeronautics. Interactions between the protection layers and the composite during lightning are not well known. This work aims at evaluating the pressure and temperature that is applied onto the composite panel by the protection layers during the lightning. A 3D fully coupled electromagnetic-thermal-mechanical numerical model is proposed. A D-wave current is injected in time on the metallic mesh external surface. The current injection surface evolves in time following a prescribed burning process. Resulting Joule effects generated in the metallic mesh are responsible of high pressures and temperatures transmitted to the underlying composite panel. The resulting computed pressure and temperatures are outputs of the simulation. Amplitudes in space and time of the resulting pressure on the surface of the composite panel are compared to models found in the literature.