Interlaminar shear behaviour and meso damage suppression mechanism of stitched composite under short beam shear using X-ray CT

He, Yujia; Mei, Ming; Wei, Kai; Yang, Xujing; Duan, Shuyong; Han, Xu

doi:10.1016/j.compscitech.2021.109189

Cited by 32 publications

(13 citation statements)

References 42 publications

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“…This kind of weak interface affects the transfer and distribution of stress in the composite material and the generation and propagation of cracks in the composite, which in turn occurs many negative impacts on the strength, toughness, heat resistance grade, and damp heat aging resistance of composite materials. [6] Therefore, appropriate interfacial strengthening measures must be taken to improve the interfacial chemical bonding and interfacial mechanical bonding between CF and PEEK matrix. [7] The method of CF surface sizing to improve the interface of CF/PEEK composites is easy to implement and has an evident interface reinforcement effect.…”

Section: Introductionmentioning

confidence: 99%

Improvement of the interfacial properties of CF/PEEK composites by introducing aminated polyphenylene sulphide (PPS‐NH₂) as a sizing agent

Ren

Zhu

Zhang³

2022

Polymer Composites

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The resin matrix and CF fibers itself of CF/PEEK composites exhibit surface inertness, resulting in poor interface bonding between CF and PEEK matrix. This phenomenon seriously affects the mechanical properties of CF/PEEK composites especially the interlaminar shear strength (ILSS). In order to improve the interfacial properties of CF/PEEK composites, a novel sizing agent of CF fibers namely PPS‐NH2 was synthesized, and its influence on the fibers–matrix interface interaction and properties of CF/PEEK composites was investigated by using scanning electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, atomic force microscopy. The results showed that the interface of CF/PEEK composite was improved by coating PPS‐NH2 sizing agent on the surface of CF. When the amination degree of PPS‐NH2 reaches 31.25%, the ILSS, flexural strength and modulus of CF/PEEK Composites reach 73.9 MPa (119%), 671.4 MPa (63%) and 32.8GPa (51%) and, respectively. At the same time, the main failure mechanism of CF/PEEK composites changes from fibers–matrix debonding into interface layer deformation and resin fracture. This method can effectively improve the interface defects between CF/PEEK composites.

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Section: Introductionmentioning

confidence: 99%

Improvement of the interfacial properties of CF/PEEK composites by introducing aminated polyphenylene sulphide (PPS‐NH₂) as a sizing agent

Ren

Zhu

Zhang³

2022

Polymer Composites

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“…Glass fiber reinforced polymer (GFRP) is a composite material with glass fiber (GF) as the reinforcement and polymer as the matrix. Due to its low density, good insulation performance, superior strength, and stiffness to weight ratio, [1][2][3] GFRP is widely used in composite insulators, dry reactor encapsulation insulation, fan blades, and other types of equipment in power systems, as well as in the insulation structures of large pulse power devices, [4] aerospace electronics, and automobile industry. [5] As important components of insulation structures, GFRP composites suffer from undetermined surface flashover events due to surface charge accumulation, [6,7] which seriously impairs the insulation performance and threatens the safe and stable operation of electrical equipment.…”

Section: Introductionmentioning

confidence: 99%

Enhancing surface insulation of glass fiber reinforced polymer composites by plasma fluorinating glass fiber

Duan

Xia

et al. 2022

Polymer Composites

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Glass fiber reinforced polymer (GFRP) is a widely used composite material in industrial production. In this article, glass fiber (GF) was fluorinated by dielectric barrier discharge (DBD), and the GFRP composites made of GF with different fluorination time and various numbers of fluorinated GF layers were prepared to improve the surface insulation property. The effect of plasma fluorination on GF was analyzed by scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS), including the surface morphology and chemical composition. In addition, the surface electrical properties of the above composites were investigated experimentally. The results show that the flashover voltage of modified GFRP is 29.84% higher than that of the original sample. By analyzing the charge dissipation and trap, it is inferred that plasma fluorination can raise the trap energy level of the composites, therefore suppressing the carrier migration on the surface and increasing the flashover voltage. Furthermore, the internal structure of composites can be improved by increasing the number of fluorinated GF layers, which accelerates the charge dissipation along the body, thus enhancing the surface insulation properties of the composites in both ways.

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“…In addition, in order to deal with the problem of damage tolerance, stitching, z-pin, clustering, and other methods are also widely used to effectively improve the damage tolerance of carbon fibre reinforced thermosetting resin composites. Wei et al [23] used short beam shear (SBS) test and X-ray computed tomography (XCT) technology to study the effects of different splicing methods and splicing spacing on interlaminar shear properties and damage suppression mechanisms of spliced composites. The SBS test results show that the interlaminar shear properties can be improved by reducing the suture spacing.…”

Section: Introductionmentioning

confidence: 99%

“…Wei et al. [ 23 ] used short beam shear (SBS) test and X‐ray computed tomography (XCT) technology to study the effects of different splicing methods and splicing spacing on interlaminar shear properties and damage suppression mechanisms of spliced composites. The SBS test results show that the interlaminar shear properties can be improved by reducing the suture spacing.…”

Section: Introductionmentioning

confidence: 99%

Preparation of CF/PEEK Composites with High Mechanical Performance Using PEEK Derivatives as the Sizing Agent

Ren

Zhu

Zhang³

et al. 2022

Macromol. Rapid Commun.

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Owing to their excellent physical and chemical properties, the carbon fibre reinforced poly(ether‐ether‐ketone) composites (CF/PEEK) are widely used in aerospace applications such as rockets, missiles, and high‐speed vehicles. However, both carbon fibre (CF) and poly(ether‐ether‐ketone) (PEEK) have inert molecular chain structures, which seriously affect the interfacial properties of CF/PEEK composites. In this study, to improve the properties of CF/PEEK composites, carboxylated PEEK (PEEK‐COOH) with different carboxylation degrees is synthesized as the sizing agent by a “two‐step” method. Then, the activated CF surface is coated by PEEK‐COOH sizing layers with different functionalization degrees to prepare the CF/PEEK composites. The results show that the interfacial properties of CF/PEEK composites are improved after applying the sizing agent. When the carboxylation degree of PEEK‐COOH is 19.61%, the flexural strength, flexural modulus, and interlaminar shear strength (ILSS) of CF/PEEK composites reach 489.34 MPa, 25.387 GPa, and 81.3 MPa, respectively. In addition, the use of PEEK‐COOH sizing agents can form an excellent transition layer between CF and PEEK, creating an efficient stress transfer system and facilitating an even stress distribution between CF and PEEK. Furthermore, the main mechanism of material fracture changes from CF debonding to CF and resin fracture.

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Interlaminar shear behaviour and meso damage suppression mechanism of stitched composite under short beam shear using X-ray CT

Cited by 32 publications

References 42 publications

Improvement of the interfacial properties of CF/PEEK composites by introducing aminated polyphenylene sulphide (PPS‐NH₂) as a sizing agent

Improvement of the interfacial properties of CF/PEEK composites by introducing aminated polyphenylene sulphide (PPS‐NH₂) as a sizing agent

Enhancing surface insulation of glass fiber reinforced polymer composites by plasma fluorinating glass fiber

Preparation of CF/PEEK Composites with High Mechanical Performance Using PEEK Derivatives as the Sizing Agent

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Interlaminar shear behaviour and meso damage suppression mechanism of stitched composite under short beam shear using X-ray CT

Cited by 32 publications

References 42 publications

Improvement of the interfacial properties of CF/PEEK composites by introducing aminated polyphenylene sulphide (PPS‐NH2) as a sizing agent

Improvement of the interfacial properties of CF/PEEK composites by introducing aminated polyphenylene sulphide (PPS‐NH2) as a sizing agent

Enhancing surface insulation of glass fiber reinforced polymer composites by plasma fluorinating glass fiber

Preparation of CF/PEEK Composites with High Mechanical Performance Using PEEK Derivatives as the Sizing Agent

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Improvement of the interfacial properties of CF/PEEK composites by introducing aminated polyphenylene sulphide (PPS‐NH₂) as a sizing agent

Improvement of the interfacial properties of CF/PEEK composites by introducing aminated polyphenylene sulphide (PPS‐NH₂) as a sizing agent