Ultra-tough and in-situ repairable carbon/epoxy composite with EMAA
| Autor: | Adrian C. Orifici, Thomas W. Loh, Everson Kandare, Raj B. Ladani |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Composite number Delamination Fracture mechanics 02 engineering and technology Epoxy 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Fracture toughness Full recovery Mechanics of Materials visual_art Crack initiation Ceramics and Composites visual_art.visual_art_medium Fracture (geology) Composite material 0210 nano-technology |
| Zdroj: | Composites Part A: Applied Science and Manufacturing. 143:106206 |
| ISSN: | 1359-835X |
| Popis: | Preforming is a common process in the manufacture of net-shaped composites, and there is a critical need for technologies that improve manufacturing speed without adversely impacting the interlaminar fracture toughness. Furthermore, composite structures that are repairable in-situ have potential for significant cost and performance benefits. This paper presents a new multi-functional composite system that combines ultra-high interlaminar fracture toughness with exceptional repair efficiency and is seamlessly integrated into the braiding process for rapid preform manufacture. The co-braided repair agent, EMAA, is shown to improve the interlaminar fracture toughness by over threefold, while enabling full recovery of the fracture properties via a thermal repair process. The resistance to crack initiation and crack propagation were strongly influenced by the geometric shape and spatial distribution of the EMAA which, in turn, was dictated by the preforming time. A new strategy is developed to produce a 3D fused EMAA network that enables the effective delivery of the repair agent into the delamination cracks and a greater than 100% recovery to the steady-state fracture toughness following delamination repair. The EMAA composites developed in this study exhibited repeated (at least three cycles) in-situ delamination repair abilities. |
| Databáze: | OpenAIRE |
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