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Abstract
An experiment platform was established for direct current resistance testing methods of carbon fibre reinforced polymer composites in this paper. Drastic differences have been found in the volume resistance of carbon fibre reinforced polymers between the theoretical values and testing values obtained with a classic three-electrode testing method for solid dielectric materials. Thus, on the basis of the experimental circuit and structures of carbon fibre reinforced polymers, an improved three-electrode testing method was put forward. The experimental results, which reflect the electric characteristics, surface coating materials and internal layer structures of carbon fibre reinforced polymers were subsequently obtained and can be well explained by the inferred conduction model, in which the electric field extension and surface current effect were considered comprehensively. This work provides a theoretical support for further research of electric characteristics, thermal degradation and weight loss of carbon fibre reinforced polymers and also lays a solid foundation for its wide applications in aerospace industries.