Three-dimensional numerical modelling of discontinuous fibre composite architectures

Luchoo, R; Harper, L.T.; Warrior, N.A.; Dodworth, A.

doi:10.1179/1743289810y.0000000023

Cited by 8 publications

(10 citation statements)

References 9 publications

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“…Thus, nonover-lapped out-of-plane geometric models have the potential to be most realistic. In this regards the work of Luchoo et al [29] was a good initial effort. He proposed a non-contact algorithm and spline interpolation to generate 3D architecture of fibre bundles.…”

Section: Geometric Modelling Strategies Of Dfc Materialsmentioning

confidence: 99%

“…The work of LT Harper et al [30] significantly improved the earlier model and [29] used a force-directed algorithm to generate 3D architecture of DFC material. The author's considered out-of-plane orientation, bending and twisting of fibres bundles, and successfully generated RVE of small fibre bundles (3k having 1.7 mm width) with volume fraction close to 50%.…”

Section: Geometric Modelling Strategies Of Dfc Materialsmentioning

confidence: 99%

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A new approach for strength and stiffness prediction of discontinuous fibre reinforced composites (DFC)

Shah

Choudhry

Mahadzir

2020

Composites Part B: Engineering

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A new modelling methodology for strength and stiffness prediction of discontinuous fibre-reinforced composites (DFC) is proposed. This has been validated for both thermoplastic and thermoset, prepreg based, carbon fibre reinforced, random DFC laminates having high volume fraction, by implementing it in a commercial FE solver. The methodology involves explicit generation of internal architecture of DFC through an algorithm which is efficient (faster model generation and solution), easily customizable and scalable. It captures many of the realistic features of the DFC such as variation in volume fraction, interlacing of strands, random orientation and thickness variation of strands. Thus, the model accounts for the natural mechanical property variation, which is characteristic of random DFCs and was found to be conservative in terms of prediction of tensile strength and stiffness for all the validation cases considered. It is generic in the sense that it can be easily extended to generate preferentially aligned and hybrid DFC laminates.

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Section: Geometric Modelling Strategies Of Dfc Materialsmentioning

confidence: 99%

Section: Geometric Modelling Strategies Of Dfc Materialsmentioning

confidence: 99%

A new approach for strength and stiffness prediction of discontinuous fibre reinforced composites (DFC)

Shah

Choudhry

Mahadzir

2020

Composites Part B: Engineering

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“…Pan et al [29] used Halpin-Tsai predictions to benchmark the FEA stiffness results, indicating relative errors of 5.8% and 12% for the tensile and shear moduli respectively. Ignoring fibre curvature can artificially increase the predicted UTS values by up to 18% [30,31].…”

Section: Introductionmentioning

confidence: 99%

“…Additional dummy sister nodes are added at each bundle end to provide the minimum number of points required for spline interpolation for bundles that have been cropped at the RVE boundary [39]. The implementation of the spline interpolation algorithm is discussed in detail in [31]. It should be noted that spline interpolation can introduce further edge-edge and edge-surface intersections, which increase in numbers as the curvature of the edge increases.…”

Section: Spline Interpolation Algorithmmentioning

confidence: 99%

3D geometric modelling of discontinuous fibre composites using a force-directed algorithm

Harper

Qian

Luchoo

et al. 2016

Journal of Composite Materials

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A geometrical modelling scheme is presented to produce representative architectures for discontinuous fibre composites, enabling downstream modelling of mechanical properties. The model generates realistic random fibre architectures containing high filament count bundles (>3k) and high (~50%) fibre volume fractions. Fibre bundles are modelled as thin shells using a multi-dimension modelling strategy, in which fibre bundles are distributed and compacted to simulate pressure being applied from a matched mould tool. FE simulations are performed to benchmark the in-plane mechanical properties obtained from the numerical model against experimental data, with a detailed study presented to evaluate the tensile properties at various fibre volume fractions and specimen thicknesses. Tensile modulus predictions are in close agreement (less than 5% error) with experimental data at volume fractions below 45%.Ultimate tensile strength predictions are within 4.2% of the experimental data at volume fractions between 40%-55%. This is a significant improvement over existing 2D modelling approaches, as the current model offers increased levels of fidelity, capturing dominant failure mechanisms and the influence of out-of-plane fibres.

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“…It has been studied by many authors for randomly distributed fiber bundles, Servais et al suggested an experimental method to measure the packing stress up to 100 kPa (i.e., low normal stress). Luchoo et al simulated the elastic response at the mesoscale. Hereunder, we consider that normal stresses (6–12 MPa) involved while press forming ROS is way higher than the packing stress and that the fiber bed is fully compacted.…”

Section: Introductionmentioning

confidence: 99%

Compression molding of Carbon/Polyether ether ketone composites: Squeeze flow behavior of unidirectional and randomly oriented strands

Picher-Martel¹,

Lévy²,

Hubert³

2015

Polym. Compos.

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Compression molding of randomly oriented strands (ROS) of thermoplastic composite is a new process that enabled the formation of complex shapes with high fiber volume fraction. During compression molding of ROS, several deformation mechanisms occurred. This article focused on the macroscopic squeeze flow mechanism. It ruled how the material will flow and fill intricate features of the mold. The squeeze flow behavior under large strain was investigated for Unidirectional (UD) and ROS. An experimental characterization was performed using an instrumented hot press. Also, to predict the associated thickness reduction, existing models using equivalent viscosity and lubrication assumptions were used. The results showed that large deformation of UD and ROS composite materials is mainly governed by two regimes: a Non‐Newtonian fluid behavior at low strain followed by a yielded phase at large strain. Quantitative indicators were defined to analyze these two phases. They showed that current models available in the literature fail to predict accurately the squeeze flow of thermoplastic composites under high strain (>50%). Also, strands size (especially strand length) has a large effect on the squeeze flow mechanism. This article provided basic process window guidelines in terms of minimum pressure and achievable strain for compression molding of ROS parts. POLYM. COMPOS., 38:1828–1837, 2017. © 2015 Society of Plastics Engineers

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Three-dimensional numerical modelling of discontinuous fibre composite architectures

Cited by 8 publications

References 9 publications

A new approach for strength and stiffness prediction of discontinuous fibre reinforced composites (DFC)

A new approach for strength and stiffness prediction of discontinuous fibre reinforced composites (DFC)

3D geometric modelling of discontinuous fibre composites using a force-directed algorithm

Compression molding of Carbon/Polyether ether ketone composites: Squeeze flow behavior of unidirectional and randomly oriented strands

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