Interlaminar properties of carbon nanotubes modified carbon fibre fabric reinforced polyimide composites

Abstract

Carbon fibre reinforced polymers are widely used in industrial applications due to their excellent properties. However, the weak matrix-dominated interlaminar properties limit its further application. With their unique properties, carbon nanotubes (CNTs) have great potential to improve the mechanical properties of composite materials. In this paper, carbon nanotube-modified carbon fibre/polyimide (CF/CNTs/PI) multi-scale composites were prepared by introducing amino-functionalized multi-walled CNTs into a PI resin matrix using an ultrasonic dispersion method. The interlaminar properties of the prepared composites were comprehensively evaluated by double cantilever beam (DCB), end-notched flexure (ENF), and short seam shear (SBS) tests. It is shown that the addition of 0.5wt.% CNTs increased the Mode I and Mode II interlaminar fracture toughness of the material by 50.21% and 61.74%, respectively, and the interlaminar shear strength (ILSS) by 42.85%. The CNTs bridging the crack tip and enhancing the fibre/matrix interface bonding ability were the dominating mechanisms for the improvement of interlaminar properties.

Off‐axis compression behavior and failure mechanisms of needled carbon/quartz fiber reinforced phenolic resin composite based on acoustic emission

“…The AE threshold was set to 45 dB, and the peak definition time, hit definition time, and hit lock time were configured to 50, 150, and 300 μs, respectively. 25 Three pencil leadbreaking tests were conducted following ASTM E976-15 procedures before each experiment to ensure a reliable connection between the AE sensor and the specimen.…”

“…The AE sensor was securely fixed on a shallow hole to effectively detect and monitor the material's damage and failure process during the compression tests, as depicted in Figure 2B. The AE threshold was set to 45 dB, and the peak definition time, hit definition time, and hit lock time were configured to 50, 150, and 300 μs, respectively 25 . Three pencil lead‐breaking tests were conducted following ASTM E976‐15 procedures before each experiment to ensure a reliable connection between the AE sensor and the specimen.…”

“…To gain a comprehensive understanding of the damage initiation, [24][25][26] progression, 27,28 and resulting failure mechanisms, [29][30][31] acoustic emission (AE) serves as a widely employed non-destructive testing method. This technique offers valuable insights into the initiation and evolution of damage in composite materials under applied loads.…”

Study on the high-speed impact resistance of porous composite laminates at high temperature

“…Morye et al [3] used high-speed camera technology to monitor the penetration process of composite laminates, and found that there were obvious deformations during high-speed penetration of composite laminates, and the damage modes of laminates were dominated by the tensile fracture of fibres.Wang et al [4] studied the response process of carbon fibre reinforced polymer laminates under high-speed impact by experimental and data analysis methods, and found that tensile failure is the main failure mode under low-speed impact.Xu et al [5] investigated the effect of size effect on the response characteristics of carbon fibre laminates to low-speed impacts through experiments and numerical simulations, and found that larger sized laminates have higher energy absorption levels and greater impact damage. Wang et al [6] The impact resistance of carbon fibre epoxy resin composite laminates with three different ply thicknesses was investigated by changing the impact energy, and it was found that the impact resistance of the composites increased with the increase of composite ply thickness under the same ply condition. Liang et al [7] investigated the effect of impactor material properties on the impact damage of composite laminates under the same impact energy, and preliminarily explained the law that the elastic properties of the impactor affect the contact stiffness and the degree of impact damage.Ozaslan et al [8] Carbon fibre composite laminates containing holes were subjected to tensile experiments, and the effects of different double-hole arrangements on the laminates were investigated.…”

Dynamic Impact Properties of Carbon-Fiber-Reinforced Phenolic Composites Containing Microfillers

“…The structural performance of polymers and fiber-reinforced polymer composites can be enhanced through the addition of filler materials such as carbon nanotube (CNT), graphene, graphene oxide (GO), nanoclay, non-metallic oxides and carbides, and metallic oxides, carbides, borides, silicates, and silicides. The modification of matrices of CFRP composites with nano- and microfillers has been reported to lead to considerable improvement in their ablation resistance [ 13 , 14 , 15 , 16 , 17 , 18 , 19 ], interlaminar shear strength (ILSS) [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ], interlaminar fracture toughness (ILFT) [ 22 , 28 , 29 , 30 ], wear and tribological properties [ 31 , 32 , 33 ], as well as flexural properties (strength and elastic modulus) [ 34 , 35 ]. Xu et al [ 13 ] studied the ablation resistance and mechanism of CF-fabric-reinforced phenolic resin composite modified with particles of tantalum disilicide (TaSi 2 ) and reported significant improvement in the anti-ablation property of TaSi 2 -modified composite in comparison with the unmodified composite.…”