Characterization of composite materials made from discontinuous carbon fibres within the framework of composite recycling

Gillet, Arnaud; Mantaux, Olivier; Cazaurang, Gilles

doi:10.1016/j.compositesa.2015.05.002

Cited by 24 publications

(25 citation statements)

References 17 publications

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“…Therefore, it is important to take into account the variability in the microstructure of RCs in order to predict their strength, especially when the dimensions of the reinforcing units are relatively large. This means that a deterministic equivalent laminate assumption might be suitable for DFCs based on small individually-dispersed fibres [20][21][22], but stochastic effects must be considered to predict the strength of TBDCs with large tows.…”

Section: Modelling Rcs Using the Equivalent Laminate Assumptionmentioning

confidence: 99%

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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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Section: Modelling Rcs Using the Equivalent Laminate Assumptionmentioning

confidence: 99%

“…Random TBDC Equivalent ply-by-ply laminate tows [2,[20][21][22][23]. The equivalent laminate assumption represents the random orientations of discontinuous composites into a ply-by-ply equivalent laminate, which contains unidirectional discontinuous plies at different orientations, usually forming a quasi-isotropic lay-up (see Figure 1).…”

Section: = ?mentioning

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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“…In general, an off-axis angle of 15% led to a maximum decrease in tensile strength of 15% (50 mm CF length). 41 In the latter case, a decrease of 15% was rather a positive result compared to AVK. 42 In this calculated case for glass fiber composite with epoxy as matrix, a 15% off-axis angle leads to a decrease in strength of about 50%.…”

Section: State Of the Art: Recycling Of Cfsmentioning

confidence: 90%

Development and validation of recycled carbon fiber-based binder tapes for automated tape laying processes

Rimmel

May

Goergen

et al. 2018

Journal of Composite Materials

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The current growth in use of fiber reinforced polymer composites causes a strongly increasing amount of waste. Current approaches for fiber reinforced polymer composites recycling usually not exploit the potential of endless fibers as they are shortened during recycling and will not be properly aligned in the final product. Considering this, the present work aimed at the development of a recycling process for long recycled carbon fibers, where fiber length is preserved and load-related fiber orientation is possible. The starting point for the presented work was so-called slivers, which are long bundles of fibers resulting from a carding process that has been applied to fiber scrap. The main focus of this work was on the development of a binder mesh application rig that processes the sliver to a binder tape, processable in an automated tape laying process, which in turn required modifications to adapt to the novel tape. The functionality of the binder tape manufacturing process was validated with long recycled carbon fibers slivers with linear density of 4 g/m and fiber lengths between 70 and 120 mm. With the binder tape preform manufactured this way, two alternative routes for composite manufacturing were tested. First, the amount of binder was set so high that direct thermoplastic pressing of the preforms was possible. Second, the amount of binder was minimized, and the preforms were infiltrated with a thermoset resin system via resin transfer molding. While the thermoplastic route showed very deficient fiber–matrix adhesion, with the thermoset route, ≈68% of stiffness and ≈31% of strength of virgin fiber-based composites could be achieved in fiber direction in a unidirectional lay-up.

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“…1,2 Relevant scholars have carried out a lot of research on the influencing factors of mechanical properties, including feature size, constituent properties, and molding process. [3][4][5][6][7][8][9][10][11][12] Nishikawa et al 13 found that the fiber length affects the nonlinearity of the stress-strain relationship of DCFRTP. Long but discontinuous fibers effectively increase the yield point of the composite.…”

Section: Introductionmentioning

confidence: 99%

A new numerical method for the tensile property analysis of discontinuous fiber-reinforced thermoplastics

Zhang

Jia

2021

Composites and Advanced Materials

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For predicting the mechanical properties of discontinuous carbon fiber-reinforced thermoplastics (DCFRTP), it is essential to consider the microstructure, including the fiber orientation and the properties of the constituting materials. In the present study, a heterogeneous particle model, considering the microscopic factors, is constructed on the basis of the peridynamic (PD) theory to investigate the tensile properties of DCFRTP. Two kinds of randomly oriented DCFRTP, with different constituents and volume fractions of carbon fiber, are used for the verification of this numerical model. A comparison between the PD simulations and the experimental results shows a good agreement. The effect of the model size on the prediction is discussed.

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Characterization of composite materials made from discontinuous carbon fibres within the framework of composite recycling

Cited by 24 publications

References 17 publications

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

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

Development and validation of recycled carbon fiber-based binder tapes for automated tape laying processes

A new numerical method for the tensile property analysis of discontinuous fiber-reinforced thermoplastics

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