Quasi-Isotropic and Pseudo-Ductile Highly Aligned Discontinuous Fibre Composites Manufactured with the HiPerDiF (High Performance Discontinuous Fibre) Technology

Longana, Marco L.; Yu, Hongkun; Lee, Juhyeong; Pozegic, Thomas; Huntley, Samantha J; Rendall, Thomas; Potter, Kevin D; Hamerton, Ian

doi:10.3390/ma12111794

Cited by 30 publications

(32 citation statements)

References 26 publications

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“…Relevant parameters taken from 46 are summarized in Table 1. Those data not available from 43–46 are specified following, 38 that is,

σ_{u, c}^{m}

=1.5

σ_{u, t}^{m}

and

σ_{u, s}^{m}

=0.5

\sqrt{σ_{u, t}^{m} σ_{u, c}^{m}}

. It is noticed that the matrix compressive and shear strengths are in fact inactive for a longitudinal tensile strength prediction.…”

Section: Resultsmentioning

confidence: 99%

“…The short fibers in the composite films prepared by HiPerDiF were nearly unidirectionally arranged. 44 Highly aligned carbon and glass SFRCs have been reported, 45 for which the mechanical and geometric parameters are summarized in Table 1. As practically used SFRCs are more often fabricated by an injection molding process, an additional Glass-2/PBT material system with the experiment available is also studied in this work.…”

Section: Methodsmentioning

confidence: 99%

“…For the present laminate, the predicted ultimate strength is 333.3 MPa, which is 27.2% higher than the measured value, 262 MPa. 45 The predicted and measured laminate stress-strain curves are depicted in Figure 10. As seen from the figure, the correlation between the prediction and the experiments is reasonably good, except for the ultimate strength.…”

mentioning

confidence: 99%

“…I G U R E 7 Strength envelope of longitudinal tension vs transverse load for unidirectional short fiber Glass-1/Epoxy composite with different A, ξ and B, V f F I G U R E 6 Predicted tensile strength varied with fiber aspect ratio having different orientation extent, the fiber volume fraction used is 0.55 [Color figure can be viewed at wileyonlinelibrary.com]5.7 | Laminate strengthLongana et al45 recently fabricated a SFRC Carbon/ Epoxy laminate, [0/±60] s . The reinforcing fibers in each ply were highly uniaxially aligned, with ξ = 429 and V f = 0.25.…”

mentioning

confidence: 99%

“…The reinforcing fibers in each ply were highly uniaxially aligned, with ξ = 429 and V f = 0.25. Measured stress-strain curve of the laminate subjected to a uniaxial tension σ xx up to failure was reported,45 where x is along the 0-direction. For this short fiber laminate, the classical laminate theory (CLT) is still applicable, giving rise to 6t…”

mentioning

confidence: 99%

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Tensile failure prediction of a short fiber or particle composite

Huang

2020

Polymer Composites

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As any failure of a short fiber reinforced composite (SFRC) is caused by a matrix failure, an accurate prediction of the latter is fundamentally important. This is achievable only when the matrix homogenized stresses are converted into true values. The conversion is made by multiplying the homogenized stresses with matrix stress concentration factors (SCFs) in the composite. Only a longitudinal SCF of the matrix in the SFRC needs

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“…Relevant parameters taken from 46 are summarized in Table 1. Those data not available from 43–46 are specified following, 38 that is,

σ_{u, c}^{m}

=1.5

σ_{u, t}^{m}

and

σ_{u, s}^{m}

=0.5

\sqrt{σ_{u, t}^{m} σ_{u, c}^{m}}

. It is noticed that the matrix compressive and shear strengths are in fact inactive for a longitudinal tensile strength prediction.…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Tensile failure prediction of a short fiber or particle composite

Huang

2020

Polymer Composites

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Fibre bridging and nozzle clogging in 3D printing of discontinuous carbon fibre-reinforced polymer composites: coupled CFD-DEM modelling

Zhang

et al. 2021

Int J Adv Manuf Technol

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A coupled multiphase model based on computational fluid dynamics (CFD) and discrete element method (DEM) is developed to numerically investigate the extrusion-based 3D printing process of discontinuous carbon fibre-reinforced polymer composites. Short carbon fibres are modelled as rigid bodies by clumping discrete spheres in DEM, while polymer matrix is treated as an incompressible Newtonian fluid in CFD. A fluid-particle interaction model is adopted to couple DEM and CFD and represent the dynamic fibre/matrix interaction. Collisions between fibres are considered naturally in DEM by using the Hertz-Mindlin contact law. The coupled CFD-DEM is validated, both qualitatively and quantitatively, against X-ray microtomography (μCT) experimental results for the T300/PA6 composite. Parametric study on various fibre lengths, fibre volume fraction and resin viscosity using the CFD-DEM model shows that the nozzle clogging tends to occur when the fibre length and/or the fibre volume fraction are increased. Use of a polymer matrix with a lower viscosity can be effective to eliminate the clogging issue when printing composites with relatively short fibres. The fibre length is dominating when long fibres are used and the clogging is largely independent on the viscosity of the polymer matrix. Finally, a potential solution of using a cone sleeve insert located above the shrinking region to address the nozzle clogging issue is proposed and numerically assessed.

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