Mode I interlaminar fracture toughness of commingled carbon fibre/PEEK composites

Yoon, Ho-Gyu; Takahashi, Kazuhiko

doi:10.1007/bf00595757

Cited by 23 publications

(14 citation statements)

References 7 publications

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“…The fracture toughness of the warp knitted laminates was only slightly lower than for the woven laminates and this may be due to the weft yarns which effectively prevented crack propagation in the woven laminates. This agrees well with the work of Yoon and Takahashi [14] on Mode I interlaminar fracture of CF/PEEK composites who reported that the cracks were arrested by the weft yarns and that a higher stress was needed to reinitiate the cracks.…”

Section: Mode Isupporting

confidence: 92%

“…The manufacturing and mechanical properties of commingled thermoplastic composites have been studied extensively by Svensson et al [12,13]. Previous work on interlaminar fracture of commingled thermoplastic composites has focused on unidirectional laminates, either carbon fiber/poly ether ether ketone composites (CF/PEEK) [14][15][16][17] or glass fiber/polypropylene composites (GF/PP) [18][19][20], in Mode I and/or Mode II. However, Ye and Friedrich [21] determined the Mode I and Mode II fracture toughnesses of woven biaxial commingled glass fiber/polyethylene terephthalate (GF/PET) laminates.…”

Section: Introductionmentioning

confidence: 99%

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Interlaminar Fracture of Commingled GF/PET Composite Laminates

Svensson¹,

Shishoo

Gilchrist

1998

Journal of Composite Materials

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The Mode I, Mode II and mixed mode (Mode I:II ratios of 4:1, 1:1 and 1:4) fracture behavior of novel textile glass fiber reinforced polyethylene terephthalate (GF/PET) laminates has been investigated. The laminates were manufactured by compression molding two different fabrics produced by weaving and warp knitting commingled GF/PET yarns. The initiation fracture toughnesses of the woven laminates in pure Mode I and Mode II were slightly higher than those of the warp knitted laminates. For the mixed modes, the difference between the fracture toughnesses of the two materials was smaller. An extensive scanning electron microscopy (SEM) investigation of the fracture surfaces was conducted to identify any characteristic failure mechanisms. The main fractographic features of the Mode I dominated failures were a brittle matrix failure and large amounts of fiber pull-out. As the Mode II loading component increased, the amount of fiber pull-out was reduced and the matrix had a more sheared appearance. A relatively large amount of cusps were found in pure Mode II and mixed mode I:II=1:4; such features are seldom seen in thermoplastic matrix composites. A general mixed mode failure criterion, which accounts for the appearance of the fracture surface, was evaluated and was seen to give a good fit to the experimental fracture toughness values.

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Section: Mode Isupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Interlaminar Fracture of Commingled GF/PET Composite Laminates

Svensson¹,

Shishoo

Gilchrist

1998

Journal of Composite Materials

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“…Because, the room temperature is higher than the T g of the polypropylene (around 0°C). Moreover, aromatic thermoplastic polymers, such as polycarbonate [16,17], polybutylene terephthalate [18], polyethersulfone [19][20][21], polyetherimide [19,22,23], polyimide [24,25], polyetheretherketone [19,[26][27][28][29] and polyphenylenesulfide [30][31][32] have also been studied for high performance carbon fibers (CFs)/polymer matrix composites. In general, the aromatic polymers have high temperature resistance, high modulus of elasticity, and water resistance.…”

Section: Introductionmentioning

confidence: 99%

“…However, the interfacial structure and the improved adhesion between the matrix polymers and carbon fibers should be important to realize the high potential of the composites. Polybutylene terephthalate [18], polyetheretherketone [19,[26][27][28][29][30] and polyphenylenesulfide [31][32][33] are semi-crystalline thermoplastic polymer matrices. The crystal size, the crystal structure, and the crystallinity would be influenced by the surface of carbon fibers as crystalization-nucleus, as well as by the cooling rate and the annealing in the fabrication process.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, it should be necessary to have good interfacial adhesion between CFs and matrix polymers for produce the high performance CFRTPs. Numerous methods for surface treatment of CFs, such as chemical modification [24,34], electrochemical oxidation [35][36][37][38][39][40][41], and plasma treatment [16,17,19,[21][22][23]29] have been studied to assure good interfacial adhesion. The basic idea of the CF surface modification is as follows.…”

Section: Introductionmentioning

confidence: 99%

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Carbon fiber reinforced thermoplastic composites from acrylic polymer matrices: Interfacial adhesion and physical properties

Kishi¹,

Nakao²,

Kuwashiro³

et al. 2017

Express Polym. Lett.

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Abstract. Acrylic polymers have high potential as matrix polymers for carbon fiber reinforced thermoplastic polymers (CFRTP) due to their superior mechanical properties and the fact that they can be fabricated at relatively low temperatures. We focused on improving the interfacial adhesion between carbon fibers (CFs) and acrylic polymers using several functional monomers for co-polymerization with methyl methacrylate (MMA). The copolymerized acrylic matrices showed good adhesion to the CF surfaces. In particular, an acrylic copolymer with acrylamide (AAm) showed high interfacial adhesive strength with CFs compared to pure PMMA, and a hydroxyethyl acrylamide (HEAA) copolymer containing both amide and hydroxyl groups showed high flexural strength of the CFRTP. A 3 mol% HEAA-copolymerized CFRTP achieved a flexural strength almost twice that of pure PMMA matrix CFRTP, and equivalent to that of an epoxy matrix CFRP.

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Improvement of carbon fiber/PEEK hybrid fabric composites using plasma treatment

Jang

Kim

1997

Polymer Composites

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A carbon fiber (CF) /polyetheretherketone (PEEK) composite was manufactured using hybrid fabrics composed of CF and PEEK fiber. The fiber/matrix interface was modified by low temperature oxygen plasma treatment. Scanning electron microscopy (SEMI, X-ray photoelectron spectroscopy (XF'S) and Fourier transform attenuated total reflection infrared spectroscopy (FTIR-ATR) were used to relate the roughness and the functionality of the CF surface with the interfacial adhesion strength of the CF/PEEK composite. Scanning electron micrographs showed that plasma treatment increased the roughness of the CF surface up to 3 min of plasma treatment time; and prolonged treatment resulted in overall smoothing. XPS results confirmed that increasing treatment time marginally increased surface functionality: treatment for more than 5 min decreased the surface functionality by removing the active site of the CF surface. In addition, flexural strength and interlaminarshear strength (ILSS) of the CF/PEEK composite were measured. Their maximum values were observed at 3 min of plasma treatment time as a result of surface roughening by plasma etching. The SEM results were correlated with mechanical properties of the CF/PEEK composite.

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Mode I interlaminar fracture toughness of commingled carbon fibre/PEEK composites

Cited by 23 publications

References 7 publications

Interlaminar Fracture of Commingled GF/PET Composite Laminates

Interlaminar Fracture of Commingled GF/PET Composite Laminates

Carbon fiber reinforced thermoplastic composites from acrylic polymer matrices: Interfacial adhesion and physical properties

Improvement of carbon fiber/PEEK hybrid fabric composites using plasma treatment

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