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

Rimmel, Oliver; Becker, David; Mitscháng, Peter

doi:10.1080/20550340.2016.1260900

Cited by 15 publications

(18 citation statements)

References 25 publications

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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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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

View full text Add to dashboard Cite

show abstract

“…This indicates that the binder was present within the material rather than on the surface, which could be the reason for its low bulk factor as well as a low permeability. Rimmel et al have already reported an influence of binder distribution on permeability (in this instance binder content and binder particle size), whereby the latter has greater influence [35]. The material that infused the preform fastest was Material A, which has the distinctive feature of a carbon fiber veil.…”

Section: Materials and Manufacturing Process Assessmentmentioning

confidence: 95%

Material selection for automated dry fiber placement using the analytical hierarchy process

Veldenz

Francesco

Giddings

et al. 2018

Advanced Manufacturing: Polymer & Composites Science

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Dry fiber tapes have become an alternative to pre-impregnated tapes for automated fiber placement. However, their industrial adoption is inhibited by high upfront research and development cost. To reduce the cost of material selection as part of such an investment, this work presents the application of the analytical hierarchy process (AHP) to material selection with a focus on material processability and manufacturing quality. The selection is based on procurement, material and its performance throughout the manufacturing process, and some laminate quality indicators. Criteria and sub-criteria were identified and implemented into the AHP. This established decision making tool was compared to a more efficient derivative using the chain of interaction method. Two materials, including the selected material, were used to manufacture a small-scale L-section composite component. This demonstrates that the proposed material selection method predicted the more preferable material for manufacturing quality when applied to a complex geometry.

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“…Also, it is known that compared to woven fabrics or noncrimp fabrics (NCF) preforms made by DFP show a deficient impregnation behavior, which results from the lack of meso-flow channels (gaps between the fiber bundles) in the DFP preforms. To increase the permeability, tufting or a modified layup sequence (gaps between the rovings) is a promising approach [26,27].…”

Section: State Of the Artmentioning

confidence: 99%

Dry fiber placement of carbon/steel fiber hybrid preforms for multifunctional composites

Kuhn

Rehra

May

et al. 2019

Advanced Manufacturing: Polymer & Composites Science

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Integration of steel fibers (SF) in carbon fiber (CF) reinforced polymer composites (CFRPC) allows improvement of electrical conductivity while maintaining excellent mechanical properties, since SF also contribute to the load-carrying capacity. Due to their high ductility, also energy absorption and structural integrity can be improved. Within this study, a preforming process for hybrid carbon/SF preforms based on dry fiber placement (DFP) is developed and validated. The investigations cover the production of bindered SF rovings, the production of hybrid preforms via DFP of spread and nonspread SF rovings on CF noncrimp fabrics (CF-NCF) as well as the production of hybrid laminates via vacuum-assisted resin infusion (VARI). The laminate quality was evaluated by microscopic images and mechanical tensile testing. A higher SF volume content within the SF areas and more homogeneous SF layers in the preform (fewer matrix-rich zones) were achieved by processing nonspread SF rovings. The more homogeneous SF layers within the samples with nonspread SF rovings compared to spread SF rovings led to higher stiffness and strength of the specimens for tension loadings and therefore to best results.

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

Cited by 15 publications

References 25 publications

Transverse permeability of dry fiber preforms manufactured by automated fiber placement

Transverse permeability of dry fiber preforms manufactured by automated fiber placement

Material selection for automated dry fiber placement using the analytical hierarchy process

Dry fiber placement of carbon/steel fiber hybrid preforms for multifunctional composites

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