Graphene/epoxy interleaves for delamination toughening and monitoring of crack damage in carbon fibre/epoxy composite laminates

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• 作者：Xusheng Du^a ; ^{xusheng.du@sydney.edu.au} ; Helezi Zhou^a ; ^b ; Weifu Sun^a ; Hong-Yuan Liu^a ; ^{hong-yuan.liu@sydney.edu.au} ; Guangnan Zhou^c ; Huamin Zhou^a ; ^b ; Yiu-Wing Mai^a
• 关键词：Functional composites ; Polymer-matrix composites ; Delamination ; Fracture toughness
• 刊名：Composites Science and Technology
• 出版年：2017
• 出版时间：1 March 2017
• 年：2017
• 卷：140
• 期：Complete
• 页码：123-133
• 全文大小：3481 K
• 卷排序：140

文摘

Functionalized graphene sheets were fabricated by a simple thermal reduction method in air at 700 °C and used to prepare graphene/epoxy (G/E) composites. The incorporation of 1.0 wt% of graphene into epoxy was found to significantly improve the matrix fracture energy by ∼150% and reduce the thermal expansion coefficient by ∼30%. When these partially cured G/E composites were used as interleaves in carbon fiber/epoxy (CF/E) composites and co-cured, a remarkable 140% increase in mode I interlaminar fracture energy was achieved. Detailed toughening mechanisms of the graphene sheets in both G/E and CF/E composites were studied. Moreover, the damage sensing capacity of the graphene interleaved CF/E composites with a simple electrical response method was demonstrated, where the electrical resistance change increased almost linearly with crack increment.