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Low-cost carbon black-loaded functional films for interlaminar toughening and in-situ delamination monitoring of carbon fiber/epoxy composites

机译:Low-cost carbon black-loaded functional films for interlaminar toughening and in-situ delamination monitoring of carbon fiber/epoxy composites

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摘要

Functional polyethersulfone (PES)/carbon black (CB) films were fabricated and interleaved into carbon fiber/epoxy composite laminates to simultaneously improve the mode I interlaminar fracture toughness (G(IC)) and delamination monitoring sensitivity. It was found that when the CB content in the functional film was 7.5 wt, the initial and propagation G(IC) of the laminate achieved the greatest improvements of 99.16 and 82.83, respectively. The toughening mechanism was mainly attributed to the formation of phase separation structure, the plastic deformation of PES and the pull-out of epoxy and CBs. Meanwhile, a delamination increment-resistance change relationship equation was proposed to predict the delamination increment of the laminate during mode I delamination. Moreover, the effect of CB content in the film on the delamination monitoring sensitivity was investigated. The pure PES film showed the largest sensitivity coefficient k of 4.55, which was much higher than that of Control (0.14). When the CB content was in the range of 2.5-7.5 wt, both G(IC) and k remained at relatively high levels, indicating that PES/CB films have promising applications in advanced multifunctional composites due to their low cost, simple manufacturing process, and large-scale industrial manufacturability.

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