Evaluation of fibre twisting angle and composite properties
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1 Downloaded from orbit.dtu.dk on: Dec 20, 2017 Evaluation of fibre twisting angle and composite properties Rask, Morten; Madsen, Bo Publication date: 2011 Link back to DTU Orbit Citation (APA): Rask, M., & Madsen, B. (2011). Evaluation of fibre twisting angle and composite properties [Sound/Visual production (digital)]. Textiles based on natural fibers for composites applications, Poznan (PL), 22 Mar, 01/01/2011 General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. Users may download and print one copy of any publication from the public portal for the purpose of private study or research. You may not further distribute the material or use it for any profit-making activity or commercial gain You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.
2 Evaluation of fibre twisting angle and composite properties Morten Rask and Bo Madsen Mt Materials il Research hdivision, i i Risø Nti National llb Laboratory for Sustainable Energy, Technical University of Denmark Textiles based on natural fibres for composites applications, workshop in NATEX project 22 nd March 2011, Poznan, Poland
3 Composite materials Fibres: Glass fibres Carbon fibres Cellulose fibres and more. Matrix: Polymers + Metals Ceramics = Composite material Glass fibres Polyester matrix Wind turbine blades made of glass/polyester composites
4 Composite parameters Mechanical properties of fibres Fibre orientation Mechanical properties of matrix Mechanical performance of composites Porosity Fibre aspect ratio Fibre content Fibre packing pattern Fibre/matrix interface properties
5 Fibre twisting in natural fibre yarns Ring spinning Twisted fibres in yarn (SEM image) Drafting rollers Gu ide Yarn Traveller Ring Bobbin of yarn Bobbin
6 Fibre twisting in natural fibre yarns Fig. 2. Environmental scanning electron microscope images of hemp yarn: (A) is He47 H47and (B) is He53. H53 Source: Madsen et al. (2007) Fig. 3. Yarn diameter as a function of fibre fb twisting angle at the yarn surface for He47 (o) and He53 ( ). Sample size is 65 for each yarn type.
7 Fibre twisting in natural fibre yarns Yarn diameter: 390 ± 90 m Fibre twisting angle: 16 ±3 Fig ESEM image of neat flax yarn. Scale bar is 100 m. Source: Pegoraro (2011), NATEX project
8 Fibre twisting in natural fibre yarns X ray tomography: Limited twisting angle in center of yarn High twisting angle at outer boundary of yarn Plane of view 1.5mm Source: Rask (2011), NATEX project
9 Fibre twisting in natural fibre yarns Estimation of the mean fibre twisting angle in a ring spun yarn Source: Madsen et al. (2007)
10 Fibre twisting in natural fibre yarns Estimation of the mean fibre twisting angle in a ring spun yarn
11 Fibre twisting in natural fibre yarns Tool for calculating the fibre twisting angle
12 Fibre orientation in composites Unidirectional fibres Loading direction 100 Stiffness of composites with different fibre types (V f = 0.50 for all composites) 101 (GPa) 80 Rule of mixtures model Stiffnes of composites E c 0 V E 1 f f V f Em 0
13 Fibre orientation in composites Unidirectional fibres: off axis angle Loading direction θ Plane stress model composites (G GPa) Stiffness of Composite stiffness vs. fibre off axis angle Glass fibres Natural fibres, good quality Natural fibres, moderate quality Fibre off axis angle (degrees)
14 Unidirectional natural fibre yarn composites Effect of yarn off axis angle Hemp yarn/pet composites Fig. 8. (a) Shows examples of tensile specimens of He53/PET composites with the yarn axis inclined at various angles to the loading direction. (b) Shows the corresponding stress strain curves. Source: Madsen et al. (2007)
15 Unidirectional natural fibre yarn composites Effect of yarn off axis angle Hemp yarn/pet composites Source: Madsen et al. (2007)
16 Unidirectional natural fibre yarn composites Effect of yarn off axis angle Flax yarn/pet composites Source: Pegoraro (2011), NATEX project
17 Fibre orientation in composites Unidirectional fibres: off axis angle Loading direction θ +θ Composites laminate theory es (GPa) composite Stiffness of Fibre off axis angle (degrees) Source: Tsai and Hahn (1980)
18 Fibre orientation in composites Twisted fibres Composite stiffness vs. fibre twisting angle 40 (GPa) Stiffness of composites ? Complex 3D fibre orientation No existing model available Fibre twisting ti angle (degrees)
19 Unidirectional natural fibre yarn composites Effect of fibre twisting i angle 0 t/m 25 t/m 51 t/m 77 t/m Source: Rask (2011), NATEX project 105 t/m 140 t/m 190 t/m
20 Unidirectional natural fibre yarn composites Effect of fibre twisting i angle Source: Rask (2011), NATEX project
21 Unidirectional natural fibre yarn composites Effect of fibre twisting i angle Source: Rask (2011), NATEX project
22 Unidirectional natural fibre yarn composites Effect of fibre twisting i angle Source: Rask (2011), NATEX project
23 Conclusion Work on fibre twisting is ongoing g We need models relating fibre twisting to composite performance We will make further experimental studies and also use a FEM approach
24 References Madsen B et. al. (2008). Hemp yarn reinforced composites I. Yarn characteristics. Composites Part A Pegoraro L (2010) Investigations of the influence from the manufacturing process and the resulting microstructures on mechanical properties of biocomposites, it Master thesis project. Rask M (2012) Microstructure and fracture mechanical properties of aligned natural fiber composites. Ongoing ph.d. project. Tsai SW and Hahn HT (1980). Introduction to composite materials. Technomic Publishing, Westport, USA.p.142.
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