Abstract
The co-curing interface between CFRP and metal has a significant influence on the comprehensive mechanical properties of the composite structure. In this paper, a series of single lap specimens were fabricated by a thermo-stamping process with fast curing prepreg and dual phase steel DP980. The thermo-stamping co-curing experiments were conducted under different forming conditions based on a grit-blasted metal surface to study the effect of process parameters on the interface strength. In addition, two types of interface strength improvement methods were tested: cutting mechanical grooves on the metal surface and smearing different carbon nanotube or graphene coatings on the metal and prepreg surfaces. The interface strength improvement mechanism was further explained by microscopic characterization. Finally, a finite element model combining cohesive element damage and three-dimensional Hashin failure was established to predict the failure mode of the co-curing joint. The results show that the initial pressure, heating curve and laying up methods have a certain degree of influence on the interface strength, and the best interface enhancement effect could be obtained by coating a carbon nanotube/epoxy resin and a curing agent on the metal and prepreg surfaces, respectively.
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