Improvement of Interlaminar Fracture Toughness in Glass Fiber Reinforced Plastic Laminates with Inorganic Nanofiber Sheet Interleaf
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The present study developed a new type of nanofibrous structure-TiO2 nanofiber sheets (TNFS) to increase the interlaminar fracture toughness of glass fiber reinforced polymer (GFRP) laminates. SEM was employed to characterize the nanofibers before and after calcination. In order to quantify TNFS, the thickness and the crevice area of TNFS were analyzed, the results showed that the thickness and the proportion of crevice area were increased with the increase of TNFS contents. Mode I and Mode II interlaminar fracture toughness were investigated for GFRP laminates toughened by different mass fraction of TNFS. The highest Mode I fracture toughness value achieved by inserting 5 wt.% TNFS in the interleaf. GIc value was 74.35 % higher than those of base GFRP laminates. Meanwhile, with 6 wt.% addition of TNFS, the GFRP laminates showed the highest Mode II fracture toughness, which is 60.76 % higher than those of base GFRP laminates. The improvement mechanism of toughness was illustrated by the fracture surface analysis of TNFS interlayered laminates.
KeywordsTiO2 nanofiber sheet Laminates Fracture toughness Fracture surface analysis Interlayer toughing mechanism
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This work is supported by the National Natural Science Foundation of China (No. 51403153), Project of Tianjin University Innovation Team (No.TD13-5043) and Natural Science Foundation of Tianjin City (No.18JCQNJC73200). We gratefully acknowledge the assistance of Prof. Xupin Zhuang for his kindly help on the electrospinning technical support. We also appreciate D.S.W Gunasekara for her kindly helping to proofread this paper.
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