期刊
COMPOSITES PART B-ENGINEERING
卷 125, 期 -, 页码 195-202出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2017.05.077
关键词
CNT fiber; Interfacial shear strength; Cryogenic treatment; Fragmentation test
资金
- National Natural Science Foundation of China [51303025, 51503120]
- Shanghai Natural Science Foundation [17ZR1400800]
- Shanghai Science and Technology Committee [14YF1409600]
- Fundamental Research Funds for the Central Universities
- DHU Distinguished Young Professor Program
The effects of cryogenic treatment (-196 degrees C) on properties of the carbon nanotube (CNT) fiber/epoxy composite are investigated using a temperature controlled cooling process with low cooling rate. The CNT fiber/epoxy single fiber composite fragmentation test is performed in conjunction with electrical resistance measurements to compare the interfacial properties at ambient and cryogenic temperatures. Weibull distribution for CNT fiber strengths shows a decreased variation (the shape parameter increases from 4.98 to 6.93) for cryo-treated fibers although their mechanical properties are not significantly influenced by the treatment. The electrical resistance measurement shows an increased electrical resistance changing rate with strain for the cryogenic treated sample, indicating better fiber/matrix interaction. In addition, the cryogenic treatment also improves interfacial bonding strength by 31% owing to the effect of differential thermal shrinkage for the CNT fiber and epoxy. An asymmetrical interfacial stress distribution is observed corresponding to the asymmetrical birefringence patterns of the fragmented fiber in the single fiber composite, which could be due to the twisted structure of the CNT fiber. (C) 2017 Elsevier Ltd. All rights reserved.
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