Cure path dependency of mode I fracture toughness in thermoplastic particle interleaf toughened prepreg laminates

Hunt, C.; Kratz, James; Partridge, Ivana K.

doi:10.1016/j.compositesa.2016.04.016

Cited by 31 publications

(14 citation statements)

References 15 publications

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“…Despite this drop, however, the values G IC for ES is still much greater. Decreasing R-curve behaviour has been observed previously for thermoplastic-toughened epoxy matrices [26,27], when the propagating crack deviates from the interlaminar region into either the interfacial or intralaminar regions, paths which provide easier crack propagation. Table 3 and Fig.…”

Section: Mode I Fracture Energysupporting

confidence: 57%

Interlaminar fracture toughness of carbon fibre/RTM6-2 composites toughened with thermoplastic-coated fabric reinforcement

Wilkinson

2017

Composites Part B: Engineering

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Thermoplastic toughening of epoxy (RTM6-2)/ carbon fibre (CF) laminate composites without modification of the resin is reported, in which a CF fabric coated with 20 weight % of a poly (aryl ether ketone) (PAEK) was used to toughen composites. Dissolution of the PAEK during resin infusion, with subsequent reaction-induced phase separation and phase inversion during curing, formed PAEK-rich continuous layers with dispersed RTM6-rich particles within the interlaminar regions. These layers provided significant toughening during interlaminar fracture testing, in which the Mode I and Mode II fracture energies for the toughened system increased from 216±7.2 to 751±105 and 857±99 Jm-2 to 3316±372 Jm-2 , respectively. Thus, coating of the CF fabric with PAEK avoided the significant increases in viscosity observed with resin systems containing dissolved thermoplastics; whilst generating multiphase toughening layers at the CF fabric-matrix interfaces which provide efficient interlaminar toughening.

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Section: Mode I Fracture Energysupporting

confidence: 57%

Interlaminar fracture toughness of carbon fibre/RTM6-2 composites toughened with thermoplastic-coated fabric reinforcement

Wilkinson

2017

Composites Part B: Engineering

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“…Contrary to this, Hunt et al. [154] reported cure path-dependent mode I fracture toughness of particle interleaf laminated composites. Zhang and Fox [175] reported the influence of manufacturing method (Quick step curing and autoclave curing) on mode I interlaminar toughness of carbon-epoxy laminated composite.…”

Section: Factors Effecting Mode I Fracture Behaviourmentioning

confidence: 96%

“…DCB is an ideal specimen type in mode I interlaminar fracture tests [4,9,41,45,114,120,123,127,146–154]. It comprises of a rectangular composite specimen with uniform thickness as shown in Figure 6(a).…”

Section: Types Of Specimensmentioning

confidence: 99%

Mode I fracture toughness of fiber-reinforced polymer composites: A review

Siddique

Abid

Shafiq

et al. 2019

Journal of Industrial Textiles

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Composite materials are known for their high stiffness and strength at lower weight as compared to conventional structural materials. Recently, there has been a growing interest in finding the new ways to decrease delamination failure, which is a life limiting factor of laminated composites. This review paper emphasizes on the effects of different reinforcement structures on mode I fracture toughness and possible ways to improve fracture toughness. A brief description on intrinsic and extrinsic mechanisms of crack growth has been discussed along with the earlier investigations and recent developments for mode I fracture toughness testing. Factors that affect the fracture toughness are also discussed. A brief knowledge of mode I fracture toughness of traditional and advanced fiber-reinforced composites is given, which could help researchers to understand fracture behaviors of composites and thus, it can help engineers to design composites with higher interlaminar strength.

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“…The interleaf materials are usually made of micronscale toughening particles, thermoplastic films or chopped fibers [6][7][8][9][10][11][12][13][14]. By generating an interlaminar layer between plies, interleaving may alleviate limitations on plastic zone development in front of the crack tip, thus allowing structures to absorb more fracture energy [10,11]. Interleaf thickness must be kept small to minimize the weight and thickness of the laminate, and to avoid possible reductions in composite flexural and in-plane properties [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Understanding interlaminar toughening of unidirectional CFRP laminates with carbon nanotube veils

González

Vilatela

2020

Composites Part B: Engineering

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The introduction of nanostructured interlayers is one of the most promising strategies for interlaminar reinforcement in structural composites. In this work, we study the failure mechanism and interlayer microstructure of aerospace-grade structural composites reinforced with thin veils of carbon nanotube produced using an industrialised spinning process. Samples of unidirectional carbon fiber/epoxy matrix composites interleaved with different composition CNT veils were prepared using hot press method and tested for interlaminar fracture toughness (IFT), measured in Mode-I (opening) and Mode-II (in-plane shear), and for interlaminar shear strength (ILSS), evaluated by the short beam shear (SBS) test. The crack propagation mode could be directly determined through fractography analysis by electron microscopy and resin/CNT spatial discrimination by Raman spectroscopy, showing a clear correlation between interlaminar reinforcement and the balance between cohesive/adhesive failure mode at the interlayer region. Composites with full resin infiltration of the CNT veils give a large increase of Mode II IFT (88%) to 1500 J/m 2 and a slight enhancement of apparent interlaminar shear strength (6.5%), but a decrease of Mode I IFT (-21%). The results help establish the role of interlayer infiltration, interlaminar crossings and formation of a carbon fiber bridgings, for interlaminar reinforcement with interleaves.

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Cure path dependency of mode I fracture toughness in thermoplastic particle interleaf toughened prepreg laminates

Cited by 31 publications

References 15 publications

Interlaminar fracture toughness of carbon fibre/RTM6-2 composites toughened with thermoplastic-coated fabric reinforcement

Interlaminar fracture toughness of carbon fibre/RTM6-2 composites toughened with thermoplastic-coated fabric reinforcement

Mode I fracture toughness of fiber-reinforced polymer composites: A review

Understanding interlaminar toughening of unidirectional CFRP laminates with carbon nanotube veils

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