development of low-cost flax fibre preforms for high
TRANSCRIPT
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Development of low-cost flax fibre preforms for high-performance
composites
FlaxPreCompNANOFORCE research program
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Wavalin cvbaVlasbedrijf Verhalle nvVanacker Rubmeke bvbaEurolino bvba
Soieries Elite nv
Flipts & Dobbels nv
Flax fibreproduction
Yarnspinning
Weaving
Industrial partners (SMEs) Research partners
KU LeuvenMTMCIT – KULAK
UGentBioscience Engineering - Woodlab
The consortium
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Outline
Why flax?
From plant to preform
Project results
Conclusion
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Drawing of glass fibers [1] Drying of flax fibers [2]
[1] J. Amos, available from http://photography.nationalgeographic.com[2] S.N., available from http://www.focal.com/img/cms/technical-folders/flax/flax-field.jpg
Flax: a natural and durable material
Why flax?
✓ Renewable resource
✓ Recyclable (thermal)
✓ Biodegradable
✓ CO2 neutral
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Flax: a natural and durable material
Why flax?
✓ Renewable resource
✓ Recyclable (thermal)
✓ Biodegradable
✓ CO2 neutral
✓ Low embodied energy
286MJ/kg
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Onlypolymer
Only carbon fibres
Only Glass fibres
Only flax fibres
Hybrid CF + flax
Fibre volume fraction (%)
Composites: embodied energy/liter
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Flax fibres: light and stiff
Specific stiffness = stiffness / density
✓ Key design parameter for lightweight constructions
✓ Indicates weight benefit energy reduction during use phase
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Outline
Why flax?
From plant to preform
Project results
Conclusion
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Location of the fibres in the stem
Charlet et al., 2011
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Extracting flax fibres for non-technical preforms
Retting
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Retting
Misalignment
NOT IDEAL FOR COMPOSITE
APPLICATIONS
Increasing cost – fibre damage - misalignment
Extracting flax fibres for technical preforms
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Retting
Increasing cost – fibre damage - misalignment
Extracting flax fibres for technical preforms
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Outline
Why flax?
From plant to preform
Project results
Conclusion
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Composite performance of scutched fibres
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Fibre stiffness
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Fibre strength
Longitudinal performance of scutched and hackled fibres is nearlyidentical
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Composite performance of scutched fibres
Transverse performance of scutched fibre composites is lower
A mild refinement operation (≠ hackling) increases performace by25%
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Fibre orientation in UD preforms
Optical (surface)
CT (thickness)
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Low-twist yarns and low-crimp weaves
Low-twist yarns decreased misorientation of the fibres
Lower twist in yarns decreased crimp in weaves
Elliptical yarn shape
Winding filament
High crimp
Low crimp
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Performance of low-crimp weaves
F. Bensadoun, 2016
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FlaxPreComp
Performance of low-crimp weaves
+15%
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Outline
Why flax?
From plant to preform
Project results
Conclusion
![Page 21: Development of low-cost flax fibre preforms for high](https://reader030.vdocument.in/reader030/viewer/2022012709/61a99f64e41dba51f51d5564/html5/thumbnails/21.jpg)
Conclusion
✓ Developed a novel alignment and fixation method to produce preforms, starting from scutched flax fibres
✓ Performance of scutched fibres matches that of hackled fibres
✓ Fibre orientation in the preforms can be monitored throughsurface scans
✓ Low-twist yarns and low-crimp weaves have been producedsuccessfully