Enhancing the fracture toughness of laminated composites through carbon nanotube belt stitching

Li, Huigai; Yu, Yongze; Xu, Xiaokui; Chen, Ting; Lu, Weibang

doi:10.1016/j.compscitech.2020.108632

Cited by 38 publications

(8 citation statements)

References 32 publications

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“…(D) Summarized interlaminar fracture toughness improvement in carbon fiber reinforced polymer composites (CFRPs) through the introduction of carbon nanotubes (CNTs). [ 2,7,26–31 ] Black color is for

G_{IC}^{VIS}

G_{IC}^{INI}

value and red color is for

G_{IC}^{PROP}

values of toughened composites with comparable CNT content…”

Section: Resultsmentioning

confidence: 99%

“…However, the relatively poor interlaminar strength, toughness, and conductivity of CFRPs, which was caused by the weak and insulating resin‐rich regions at ply‐ply interfaces, greatly limit their light‐weighting efficiency. In the last few decades, several interlaminar strengthening methods, such as interlayer toughening, [ 1–3 ] z‐pinning, [ 4–6 ] stitching, [ 7–9 ] as well as 3D weaving, [ 10–12 ] have been developed. Although most of these methods are effective in enhancing the interlaminar mechanical properties, they usually have a negative effect on in‐plane mechanical performance because of the fiber damage, fiber misalignment as well as in‐plane fiber volume loss.…”

Section: Introductionmentioning

confidence: 99%

“…Inspired by CNT array stitching, in our previous study, [ 7 ] we proposed another method of enhancing the interlaminar bonding by introducing continuous CNT belts in the whole‐through‐thickness direction of the laminated composite, and found that this approach could also increase G IC and G IIC of laminated composites by 62.5% and 94.3%, respectively. Meanwhile, the in‐plane tensile and bending strength of the laminates was marginally affected after CNT belt stitching.…”

Section: Introductionmentioning

confidence: 99%

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Aligned carbon nanotube composite belts stitching of laminated composites for enhanced fracture toughness and enriched functionalities

Xu²,

et al. 2022

Polymer Composites

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Realizing the full potential of advanced fiber reinforced polymeric composites has been impeded by their weak interlaminar performance. Herein, a wholethrough-thickness stitching strategy was proposed to address this key challenge by using ultrathin, high performance aligned carbon nanotube (CNT) composite belts as stitching sutures. During the fabrication of aligned CNT composite belts, the as-made CNT belts that consist of randomly orientated CNTs were firstly stretched before resin infiltration. It has been found that the tensile strength and modulus of aligned CNT composite belts reached 1126.9 MPa and 56.2 GPa, with an improvement of 227.9% and 726.5% than those of unstretched composite belts, respectively. After stitching, the Mode I interlaminar fracture toughness and through-thickness electrical conductivity of carbon fiber reinforced laminated composites was enhanced by 138.7% and 426.7%, respectively, which was mainly due to the bridging effect of strong and conducting CNT belts. In addition, the interlaminar crack propagations can be in situ monitored by tracking the resistance variation of the stitched laminates under loading. Thus, this stitching strategy provides an effective approach to not only enhance the structural performance of fiber reinforced polymeric composites, but also enrich their functionalities.

show abstract

G_{IC}^{VIS}

G_{IC}^{INI}

value and red color is for

G_{IC}^{PROP}

values of toughened composites with comparable CNT content…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Aligned carbon nanotube composite belts stitching of laminated composites for enhanced fracture toughness and enriched functionalities

Xu²,

et al. 2022

Polymer Composites

Self Cite

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show abstract

“…CNT films with thickness of 7-9 um, which were fabricated by using the Float Catalyst Chemical Vapor Deposition (FCCVD) method [30], were supplied by Suzhou Creative Nanotechnology Ltd., China. The film was used as received.…”

Section: Methodsmentioning

confidence: 99%

Effects of ultrasonication on the microstructures and mechanical properties of carbon nanotube films and their based composites

Zhang

Jiang

et al. 2022

Composites Science and Technology

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“…The interlaminar shear stress is one of the key factors contributing to the delamination damage. A series of techniques have been developed to improve the interlaminar fracture toughness of composite laminates, including the addition of nanoparticles, [6] high-toughness matrix, [7] fiber/matrix interface modification, [8] stitching, [9,10] z-pining, [11][12][13] and so forth. Among these methods, z-pinning technique is especially suitable for the composite laminates made from prepreg materials, which may significantly increase the resistance against delamination crack.…”

Section: Introductionmentioning

confidence: 99%

Mode II interlaminar fracture toughness enhancement of fine z‐pin reinforced carbon fiber composite with low fraction of pins

Che

Wang

et al. 2022

Polymer Composites

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This article aims to improve the shear delamination resistance of composite laminate and minimize implantation damage on fiber orientation by using fine z-pins.The z-pins with the diameters as small as 0.1 and 0.2 mm were prepared by using different carbon fibers. The results show that z-pinning method significantly improves the mode II interlaminar fracture toughness, and the G IIC value becomes larger with the decrease in z-pin diameter. Compared with the control sample, the precracked G IIC values of (carbon fiber-reinforced polymer composite) CFRP (0.5CF4XÀpin) , CFRP (0.2CF4XÀpin) , and CFRP (0.1CF4XÀpin) increase by 67%, 142%, and 176%, respectively. As z-pin diameter decreases from 0.5 to 0.1 mm, the failure mode changes from z-pin pullout to shear fracture. The evolution of failure mode greatly enhances the resistance to crack propagation and the final G IIC value. The carbon fiber type of pin (0.5mm) has no obvious influence on the delamination sliding resistance. For pin (0.1mm) and pin (0.2mm) , the strong deformation resistance of z-pin is the dominant factor driving the improvement of the G IIC values though providing high-shear traction load. In addition, the z-pins with large shear deformation capacity can also enhance the crack sliding resistance.

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Enhancing the fracture toughness of laminated composites through carbon nanotube belt stitching

Cited by 38 publications

References 32 publications

Aligned carbon nanotube composite belts stitching of laminated composites for enhanced fracture toughness and enriched functionalities

Aligned carbon nanotube composite belts stitching of laminated composites for enhanced fracture toughness and enriched functionalities

Effects of ultrasonication on the microstructures and mechanical properties of carbon nanotube films and their based composites

Mode II interlaminar fracture toughness enhancement of fine z‐pin reinforced carbon fiber composite with low fraction of pins

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