Characterisation of random carbon fibre composites from a directed fibre preforming process: Analysis of microstructural parameters

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

doi:10.1016/j.compositesa.2005.11.014

Cited by 54 publications

(42 citation statements)

References 26 publications

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“…The spray path was optimised to ensure uniform fibre distribution and to minimise any orientation bias from the chopping device [26,27]. Freekote 700NC mould release agent was applied to the tool surface prior to spraying.…”

Section: Dfc Charge Manufacturementioning

confidence: 99%

“…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: Dfc Charge Manufacturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flow characteristics of carbon fibre moulding compounds

Evans

Qian

Turner

et al. 2016

Composites Part A: Applied Science and Manufacturing

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“…The mechanical properties of composite components are strongly influenced by the morphology and weight percentage of the glass fibers. Evidently, an inhomogeneous microstructure can result in local variations of the stress concentration, which can affect the mechanical performance of the composite material [3,4]. In recent years, in order to characterize the microstructures of fiber-reinforced composites, different image-analysis techniques have been applied using optical microscopy or scanning electron microscopy (SEM) [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

A Voronoi-diagram analysis of the microstructures in bulk-molding compounds and its correlation with the mechanical properties

Bertoncelj¹,

Vojisavljević²,

Rihtarsic³

et al. 2016

Express Polym. Lett.

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Abstract. Voronoi analysis is implemented to assess the influence of fiber content on the microstructure and mechanical properties of bulk-molding compounds containing different weight fractions of E-glass fibers (EGF) (5-20 wt%). The fiber distribution in the polymer matrix is analyzed by scanning electron microscopy followed by the Voronoi tessellations, radial distribution function and statistical calculations. The experimental results are compared to modelled microstructures. The derived microstructural descriptors allow us to correlate the fiber weight content and the degree of fiber distribution homogeneity with the mechanical properties of EGF-reinforced composites. The distribution of fibers in composites with 10 and 15 wt% of fibers could be considered as the most homogeneous. This is in a good agreement with the results of the flexural strength and dynamic mechanical analyses, which confirmed that the latter samples exhibit the highest level of reinforcement.

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“…Due to the discontinuous nature of the tows, these materials can be compression-moulded, which significantly improves their manufacturability. In addition, the tow-based architecture of TBDCs allows for a high fibre-content, leading to high modulus and toughness [1][2][3][4][5][6]. This combination of manu-facturability and good mechanical properties makes TBDCs appealing for high-volume production of structural components.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of randomly-oriented tow-based discontinuous composites and their equivalent laminates

Pimenta

Singgih

et al. 2017

Composites Part A: Applied Science and Manufacturing

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The equivalent laminate assumption is a commonly-used method to model the random architecture of discontinuous composites, but which has never been validated experimentally. This study aims to verify the equivalent laminate assumption, focusing on tow-based discontinuous composites (TBDCs), which have higher fibre-content and thus improved modulus and strength, compared to conventional discontinuous-fibre composites. This verification was achieved by manufacturing and testing (i) actual TBDCs with randomly oriented tows and (ii) their equivalent laminates (ELs), at two different tow thicknesses. The results show that ELs exhibit the same failure mechanisms as TBDCs, and are similarly weakened by an increase in tow thickness. However, ELs lack the spatial variability in local fibre-content and local tow orientations, which makes ELs stronger than TBDCs. Therefore, the equivalent laminate assumption is suitable for predicting the modulus of discontinuous composites, but cannot predict their strength without considering the local variability in their microstructure.

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Characterisation of random carbon fibre composites from a directed fibre preforming process: Analysis of microstructural parameters

Cited by 54 publications

References 26 publications

Flow characteristics of carbon fibre moulding compounds

Flow characteristics of carbon fibre moulding compounds

A Voronoi-diagram analysis of the microstructures in bulk-molding compounds and its correlation with the mechanical properties

Experimental investigation of randomly-oriented tow-based discontinuous composites and their equivalent laminates

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