Dry fiber automated placement of carbon fibrous preforms

Belhaj, Mariem; Deléglise, M.; Comas-Cardona, Sébastien; Demouveau, Hervé; Binétruy, Christophe; Duval, Christian; Figueiredo, Philippe

doi:10.1016/j.compositesb.2013.01.014

Cited by 64 publications

(41 citation statements)

References 10 publications

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“…Still, they conducted their examinations at fiber volume contents of lower than 45%. The influence of roving shifting during layup has been considered by Belhaj et al 32 Besides a reference, at which all rovings (12 k) have been ideally placed next to each other without separation, they also investigated preforms with gaps or overlaps of 2 mm at each fifth roving. The permeability with the laps was about 30% lower than for the other layup patterns, which were all in a very close range.…”

Section: Test Planmentioning

confidence: 99%

Maximizing the out-of-plane-permeability of preforms manufactured by dry fiber placement

Rimmel

Becker

Mitscháng

2016

Advanced Manufacturing: Polymer & Composites Science

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Dry fiber placement (DFP) is a technology which enables outstandingly high mechanical performance of composite parts as preform structures with load-related fiber orientations can be created with minimum of fiber crimp. Furthermore, DFP has high cost-saving potential due to minimum material wastage during production. Recently, the efficiency has been further improved using an online binder application system, allowing the direct usage of untreated rovings instead of pre-designed rovings with binder applied by the manufacturer. Nevertheless, the poor impregnation behavior of DFP-preforms during liquid composite molding processing methods remains a main challenge. Encouraging an out-of-plane impregnation, e.g. by using a vacuum-assisted or compression resin transfer molding process, reduces the flow length within the preform and is a first step toward reducing cycle times. However, further improvements are required in order to apply DFP-preforming methods in serial production.Within this study influences on the out-of-plane permeability of DFP-preforms were investigated. The considered parameters were related to the material (e.g. binder amount) as well as the layup process and subsequent process steps.

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Section: Test Planmentioning

confidence: 99%

Maximizing the out-of-plane-permeability of preforms manufactured by dry fiber placement

Rimmel

Becker

Mitscháng

2016

Advanced Manufacturing: Polymer & Composites Science

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“…Recent work on permeability of dry tape preforms has focused on the experimental analysis by varying gap sizes, binder amounts, layup sequence, and tufting of preforms, in order to enhance the permeability [19,20]. However, no study has considered a detailed experimental and computational modelling approach for permeability predictions of AFP dry tape preforms.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Transverse permeability of dry fiber preforms manufactured by automated fiber placement

Aziz

Ali

Zeng

et al. 2017

Composites Science and Technology

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This work presents a correlation between the transverse permeability of a preform and the process variability of the automated dry fiber placement manufacturing technique. In this study, an experimental and numerical analysis of the dry tape preform, with a focus on its through-thickness permeability, has been undertaken. Geometric models, containing flow channels of two different width dry tape carbon preforms, have been created in the TexGen modeller. A Computational fluid dynamics (CFD) simulation has been undertaken to obtain the predicted through-thickness-permeability of the dry tape preform. A parametric study on the effect of different dry tape gap sizes on the permeability of the preform is presented. An in-situ compaction study, carried out in an X-CT machine, revealed that the gap sizes were irregular throughout the manufactured preforms. In addition, an experimental investigation of the through-thickness permeability, which is based on a saturated flow condition at a thickness corresponding to full vacuum pressure, is also presented. The permeability prediction based on the X-CT re-constructed geometric model has been validated using the experimental data. A further parametric study has revealed that the process variablity in automated dry fibre placement influences the through-thickness permeability by a factor of upto 5.

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“…Still, they conducted their examinations at FVCs <45%. The influence of roving shifting during layup has been considered by Belhaj et al . Besides a reference, at which all rovings (12k) have been ideally placed next to each other without separation, they also investigated preforms with gaps or overlaps of 2 mm at each fifth roving.…”

Section: Theoretical Background and State Of The Artmentioning

confidence: 99%

Impact of stitching on permeability and mechanical properties of preforms manufactured by dry fiber placement

2018

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Dry fiber placement (DFP) is a technology that enables outstandingly high mechanical performance of composite parts, as preform structures with load‐related fiber orientations can be created with minimum of fiber crimp and undulation. Yet, the poor impregnation behavior of DFP preforms during liquid composite molding processing methods remains a main challenge. Encouraging an out‐of‐plane impregnation, for example, by using a vacuum assisted or compression resin transfer molding process, reduces the flow length within the preform and is a first step towards reducing cycle times. However, further improvements are required in order to apply DFP preforming methods in serial production. In a previous work, the influence of various process parameters as well as post‐treatment steps on out‐of‐plane permeability have been investigated with the conclusion, that tufting/stitching led to the highest increase in out‐of‐plane permeability (more than two decades). For further understanding, this study deals with the influence of a stitching step on the out‐of‐plane permeability of DFP preforms as well as the mechanical properties of the finished laminate depending on a variety of stitching parameters such as thread tension during stitching, denier of the used thread, stitch distance, seam distance, seam displacement, and treated DFP layup. It is shown that the biggest impact on out‐of‐plane permeability results from the achieved stitching density (as a product of stitch distance and seam distance) and denier while thread tension and seam displacement show negligible effects. For the mechanical properties, it can be stated that the presence of stitching channels in thickness directions leads to a minor decrease of tensile properties while bending properties are more significantly reduced by about 30%. POLYM. COMPOS., 40:1631–1642, 2019. © 2018 Society of Plastics Engineers

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Dry fiber automated placement of carbon fibrous preforms

Cited by 64 publications

References 10 publications

Maximizing the out-of-plane-permeability of preforms manufactured by dry fiber placement

Maximizing the out-of-plane-permeability of preforms manufactured by dry fiber placement

Transverse permeability of dry fiber preforms manufactured by automated fiber placement

Impact of stitching on permeability and mechanical properties of preforms manufactured by dry fiber placement

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