Notched behavior of prepreg-based discontinuous carbon fiber/epoxy systems

Feraboli, Paolo; Peitso, Elof; Cleveland, Tyler; Stickler, Patrick B.; Halpin, J. C.

doi:10.1016/j.compositesa.2008.12.012

Cited by 92 publications

(81 citation statements)

References 9 publications

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“…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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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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“…This can be attributed to size effects [37], as a constant width test coupon was used for all fibre lengths according to ISO 527-4: 1997. Other studies in the literature have shown that increasing the specimen width relative to the fibre length would increase the tensile modulus but decrease the tensile strength [10,11]; since the tensile modulus is a volume averaged property whereas the strength is dominated by critical flaws. The probability of a critical flaw increases as the volume of the coupon increases.…”

Section: Effect Of Fibre Lengthmentioning

confidence: 99%

“…It is typically based on chopped unidirectional (UD) prepreg, which offers fibre volume fractions approaching 60% [8], due to the efficient packing of the filaments within the UD chips. These materials are reported to be notch insensitive and exhibit a low sensitivity to defects [9,10], as stress concentrations present at the bundle ends are often larger than geometrical stress concentrations resulting from the notch [11]. A high viscosity epoxy matrix is required to avoid fibre/matrix separation during moulding [12], which can be a particular problem for ribbed parts [13].…”

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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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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“…Feraboli et al [38,39] investigated the notched failure response of oriented strand board (OSB) in the form of wood composite and carbon fiber/epoxy composites, in particular the tensile strength of specimens containing circular holes of a various dimensions, and the influence of specimen size and scaling on the measured strength and the characteristic distance. They concluded that OSB and carbon fiber/epoxy composites are notch insensitive due to the internal stress concentration arising from the heterogeneous nature of the substructure.…”

Section: Notch Sensitivity Of the Compositesmentioning

confidence: 99%

Mechanical Properties of Natural Jute Fabric/Jute Mat Fiber Reinforced Polymer Matrix Hybrid Composites

Elbadry

Aly-Hassan

Hamada

2012

Advances in Mechanical Engineering

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Recycled needle punched jute fiber mats as a first natural fiber reinforcement system and these jute mats used as a core needle punched with recycled jute fabric cloths as skin layers as a second natural fiber reinforcement system were used for unsaturated polyester matrix composites via modifying the hand lay-up technique with resin preimpregnation into the jute fiber in vacuum. The effect of skin jute fabric on the tensile and bending properties of jute mat composites was investigated for different fiber weight contents. Moreover, the notch sensitivity of these composites was also compared by using the characteristic distance d o calculated by Finite Element Method (FEM). The results showed that the tensile and flexural properties of jute mat composites increased by increasing the fiber weight content and by adding the jute fabric as skin layers. On the other hand, by adding the skins, the characteristic distance decreased and, therefore, the notch sensitivity of the composites increased. The fracture behavior investigated by SEM showed that extensive fiber pull-out mechanism was revealed at the tension side of jute mat composites under the bending load and by adding the jute cloth, the failure mode of jute mat was changed to fiber bridge mechanism.

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Notched behavior of prepreg-based discontinuous carbon fiber/epoxy systems

Cited by 92 publications

References 9 publications

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

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

Flow characteristics of carbon fibre moulding compounds

Mechanical Properties of Natural Jute Fabric/Jute Mat Fiber Reinforced Polymer Matrix Hybrid Composites

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