Characterisation of random carbon fibre composites from a directed fibre preforming process: The effect of tow filamentisation

Harper, L.T.; Turner, T.A.; Warrior, N.A.; Rudd, C.D.

doi:10.1016/j.compositesa.2006.09.008

Cited by 47 publications

(53 citation statements)

References 23 publications

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“…Chopping fibre bundles shorter increased the level of natural bundle fragmentation, as shown in Figure 11, effectively reducing the filament count per fibre bundle [26]. This consequently increased the loft (bulk factor) of the compound, increasing the compression forces required to close the mould tool [25] and reducing the permeability of the fibre architecture [39]. The number of fibre-fibre interactions also increases with shorter fibre lengths, increasing the frictional forces between the fibres, causing fibre bundle agglomeration and preventing fibre flow [40].…”

Section: Effect Of Fibre Lengthmentioning

confidence: 98%

“…DFC is an automated process that simultaneously deposits virgin carbon tows and a low cost liquid epoxy onto a tool surface. It is based on previous work by the authors and is a development of the Directed Carbon Fibre Preforming process (DCFP) [25][26][27]. DFC uses the same fibre chop and spray technology as DCFP, but a liquid resin is deposited simultaneously with the fibre to produce a material for compression moulding, avoiding the separate resin injection phase typically associated with DCFP.…”

Section: Introductionmentioning

confidence: 99%

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Flow characteristics of carbon fibre moulding compounds

Evans

Qian

Turner

et al. 2016

Composites Part A: Applied Science and Manufacturing

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This paper presents the development of a low-cost carbon fibre moulding compound using an automated spray deposition process. Directed Fibre Compounding (DFC) is used to produce charge packs directly from low cost carbon fibre tows and liquid epoxy resin. A range of material and process related parameters have been studied to understand their influence on the level of macroscopic charge flow, in an attempt to produce a carbon fibre moulding compound with similar flow characteristics to conventional glass fibre SMCs.Charge packs covering just 40% of the mould can be effectively used to process DFC, without detrimentally affecting void content, fibre distribution and mechanical properties. Tensile stiffness and strength values of 36GPa and 320MPa are reported for isotropic materials (100% charge coverage), which increase to 46GPa and 408MPa with flow induced alignment (50% charge coverage) at 50% fibre volume fraction.

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Section: Effect Of Fibre Lengthmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Flow characteristics of carbon fibre moulding compounds

Evans

Qian

Turner

et al. 2016

Composites Part A: Applied Science and Manufacturing

Self Cite

View full text Add to dashboard Cite

show abstract

“…In addition, this model is also paramount for understanding and simulating state-of-theart multiscale discontinuous-fibre composites, both virgin (Feraboli et al, 2009, Harper et al, 2007 and recycled Pinho, 2014, Pimenta et al, 2010). and c G − 1 partially broken ones.…”

Section: Discussionmentioning

confidence: 99%

An analytical model for the translaminar fracture toughness of fibre composites with stochastic quasi-fractal fracture surfaces

Pimenta

Pinho

2014

Journal of the Mechanics and Physics of Solids

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The translaminar fracture toughness of fibre-reinforced composites is a size-dependent property which governs the damage tolerance and failure of these materials. This paper presents the development, implementation and validation of an original analytical model to predict the tensile translaminar (fibre-dominated) toughness of composite plies and bundles, as well as the associated size effect. The model considers, as energy dissipation mechanisms, debonding and pull-out of bundles from quasi-fractal fracture surfaces; the corresponding lengths are stochastic variables predicted by the model, based on the respective bundle strength distributions and fracture mechanics. Parametric studies show that composites are toughened by stronger fibres with large strength variability, and intermediate values of interfacial toughness and friction. Predictions are validated against four different composite ply systems tested in the literature, proving the models ability to capture not only size effects, but also the influence of different fibres and resins.

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“…However, the recent developments in composites with thin plies (Sihn et al, 2007) and with discontinuous reinforcement -with individual fibres and bundles of various sizes (Harper et al, 2007, Pimenta et al, 2010 -requires developing and validating full scaling models. Wisnom (1999) suggests Fibre Bundle Models (FBMs, firstly developed by Daniels, 1945, and recently reviewed by Pradhan et al, 2010) have the potential to capture most of the physics involved in longitudinal tensile failure of FRPs and the associated size effects.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical scaling law for the strength of composite fibre bundles

Pimenta

Pinho

2013

Journal of the Mechanics and Physics of Solids

112

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This paper presents an analytical model for size effects on the longitudinal tensile strength of composite fibre bundles. The strength of individual fibres is modelled by a Weibull distribution, while the matrix (or fibre-matrix interface) is represented through a perfectly-plastic shear-lag model. A probabilistic analysis of the failure process in hierarchical bundles (bundles of bundles) is performed, so that a scaling law relating the strength distributions and characteristic lengths of consecutive bundle levels is derived. An efficient numerical scheme (based on asymptotic limits) is proposed, hence couponsized bundle strength distributions are obtained almost instantaneously. Parametric studies show that both fibre and matrix properties are critical for bundle strength; model predictions at different scales are validated against experimental results available in the literature.

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Characterisation of random carbon fibre composites from a directed fibre preforming process: The effect of tow filamentisation

Cited by 47 publications

References 23 publications

Flow characteristics of carbon fibre moulding compounds

Flow characteristics of carbon fibre moulding compounds

An analytical model for the translaminar fracture toughness of fibre composites with stochastic quasi-fractal fracture surfaces

Hierarchical scaling law for the strength of composite fibre bundles

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