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Evaluation of Graphene Oxide–Modified Repair Methodologies in Carbon Fiber Reinforced Polymer Composites for Aerospace Applications
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DOI：10.1002/pc.71329.png)
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Abstract
En 中文
The structural design of damaged carbon fiber reinforced polymer (CFRP) components remains a major unresolved challenge, particularly under field conditions where processing quality cannot be rigorously controlled. Traditional wet lay-up repairs, though widely employed, offer poor fiber–matrix consolidation and weak interfacial integrity, leading to markedly inferior mechanical performance compared with prepreg-based systems. Here we demonstrate a targeted nanomodification strategy in which graphene oxide (GO) nanoparticles are integrated into an aerospace-grade epoxy matrix to elevate wet lay-up repair performance toward prepreg benchmarks. GO, synthesized via a modified Hummers method and dispersed at 0.3–2.5 wt%, enables a distinct, non-linear reinforcement response: low loadings (0.3–0.5 wt%) significantly enhance tensile strength—from 282 MPa (unmodified) to 309 and 360 MPa—approaching the prepreg reference (≈391 MPa). At 2.5 wt% GO, however, severe nanoparticle agglomeration disrupts matrix continuity, reducing strength to 250 MPa. These results, for the first time, define an optimal GO concentration window capable of bridging the long-standing mechanical performance gap between wet lay-up and prepreg repair strategies. The study systematically and directly evaluates wet lay-up and prepreg repair methods in a comparative framework, experimentally elucidating the mechanical performance differences between these two distinct repair approaches. Furthermore, it reveals the mechanistic basis of GO-induced interfacial reinforcement and establishes a viable nanostructural design pathway for high-fidelity, cost-effective CFRP repair in aerospace maintenance applications.
Keywords:
CFRP
composite repair applications
graphene oxide
structural repair
wet lay-up method
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