Abstract
Improving the load-bearing capacity of metal/carbon- fiber- reinforced polymer (CFRP) interfaces is crucial for their application in the aerospace industry. In this study, metal/CFRP interfacial performance is enhanced by the simultaneous use of multi-walled carbon nanotube (MWCNT)-modified adhesives and metal surface treatments. The core innovation lies in establishing a metal-epoxy-carbon fiber interface model using molecular dynamics (MD) simulations to investigate elucidate the synergistic strengthening mechanisms of the modification methods at the molecular level.
The effectiveness of various combinations of modification methods in improving the shear strength was analyzed using single-lap joint shear tests and double cantilever beam tests. The findings indicated that the synergistic effect of the MWCNT-modified adhesive and the chemical corrosion (CC) method enhanced the shear strength of the SS/CFRP joints by 22.4%. The synergistic strengthening effect was investigated using a combination of characterization techniques, including two-dimensional digital image correlation analysis, scanning electron microscopy, attenuated total- reflectance Fourier- transform infrared spectroscopy, and atomic force microscopy.
Additionally, MD simulations revealed higher relative hydroxyl concentrations at the SS/CFRP interface following CC treatment. Simultaneously, an oxide layer was formed on the metal surface, which not only increased the surface roughness, but also introduced new surface functional groups. These functional groups led to stronger interactions with the epoxy resin -NH- groups, thereby enhancing the adhesion performance of the SS/CFRP joints. Overall, this study provides innovative insights into enhancing metal/composite bonding in the aerospace industry, paving the way for the development of fiber metal hybrid composites.
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