10 results found
Shamsuddin SR, Lee KY, Bismarck A, 2016, Ductile unidirectional continuous rayon fibre-reinforced hierarchical composites, Composites Part A: Applied Science and Manufacturing, Vol: 90, Pages: 633-641, ISSN: 1359-835X
Endless rayon fibres (Cordenka®) were used to reinforce polyhydroxybutyrate (PHB) nanocomposites containing 2.5 wt.% nanofibrillated cellulose (NFC) to create truly green hierarchical composites. Unidirectional (UD) composites with 50–55% fibre volume fraction were produced using a solvent-free continuous wet powder impregnation method. The composites exhibit ductile failure behaviour with a strain-to-failure of more than 10% albeit using a very brittle matrix. Improvements at a model composite level were translated into higher mechanical properties of UD hierarchical composites. The Young’s moduli of rayon fibre-reinforced (NFC-reinforced) PHB composites were about 15 GPa. The tensile and flexural strength of hierarchical PHB composites increased by 15% and 33% as compared to the rayon fibre-reinforced neat PHB composites. This suggests that incorporation of NFC into the PHB matrix binds the rayon fibres, which does affect the load transfer between the constituents resulting in composites with better mechanical properties.
Blaker JJ, Anthony DB, Tang G, et al., 2016, Property and shape modulation of carbon fibers using lasers, ACS Applied Materials & Interfaces, Vol: 8, Pages: 16351-16358, ISSN: 1944-8244
An exciting challenge is to create unduloid-reinforcing fibers with tailored dimensions to produce synthetic composites with improved toughness and increased ductility. Continuous carbon fibers, the state-of-the-art reinforcement for structural composites, were modified via controlled laser irradiation to result in expanded outwardly tapered regions, as well as fibers with Q-tip (cotton-bud) end shapes. A pulsed laser treatment was used to introduce damage at the single carbon fiber level, creating expanded regions at predetermined points along the lengths of continuous carbon fibers, whilst maintaining much of their stiffness. The range of produced shapes was quantified and correlated to single fiber tensile properties. Mapped Raman spectroscopy was used to elucidate the local compositional and structural changes. Irradiation conditions were adjusted to create a swollen weakened region, such that fiber failure occurred in the laser treated region producing two fiber ends with outwardly tapered ends. Upon loading the tapered fibers allow for viscoelastic energy dissipation during fiber pull-out by enhanced friction as the fibers plough through a matrix. In these tapered fibers, diameters were locally increased up to 53%, forming outward taper angles of up to 1.8°. The tensile strength and strain to failure of the modified fibers were significantly reduced, by 75% and 55%, respectively, ensuring localization of the break in the expanded region; however, the fiber stiffness was only reduced by 17%. Using harsher irradiation conditions, carbon fibers were completely cut, resulting in cotton-bud fiber end shapes. Single fiber pull-out tests performed using these fibers revealed a 6.75 fold increase in work of pull-out compared to pristine carbon fibers. Controlled laser irradiation is a route to modify the shape of continuous carbon fibers along their lengths, as well as to cut them into controlled lengths leaving tapered or cotton-bud shapes.
Blaker JJ, Anthony DB, Tang G, et al., 2015, Carbon fibres with modulated properties and shape along the fibre length, 20th International Conference on Composite Materials, Publisher: ICCM
This paper presents a detailed experimental examination of the influence of the thickness of flatenergy directors (ED) on the ultrasonic welding (USW) process for carbon fibre/polyetherimidecomposites. Three thicknesses of flat ED were compared: 0.06 mm, 0.25 mm and 0.50 mm. Power anddisplacement data for 0.06 mm-thick EDs did not clearly show the stages of the process and thelocation of the optimum for best weld quality. Consequently, an investigation of samples welded atdifferent stages in the welding process had to be performed. For 0.06 mm-thick EDs, the optimum wasdetermined to occur at the beginning of the downward displacement of the sonotrode in the vibrationphase. The output parameters at the optimum conditions for all thicknesses were compared. Averagelap shear strength was found to be lowest for 0.06 mm-thick EDs. Based on the analysis of the fracturesurfaces, resin flakes and voids were observed when using the thinnest energy directors, indicatingthermal degradation. These observations suggest that thin energy directors are not as efficient asthicker EDs (i.e. 0.25 mm) to achieve preferential heat generation at the weld line, leading to lessconsistent weld quality.
Lee K-Y, Shamsuddin SR, Fortea-Verdejo M, et al., 2014, Manufacturing Of Robust Natural Fiber Preforms Utilizing Bacterial Cellulose as Binder, JOVE-JOURNAL OF VISUALIZED EXPERIMENTS, ISSN: 1940-087X
Zhao J, Ho KKC, Shamsuddin S-R, et al., 2012, A comparative study of fibre/matrix interface in glass fibre reinforced polyvinylidene fluoride composites, 25th Meeting of the European-Colloid-and-Interface-Society (ECIS), Publisher: ELSEVIER SCIENCE BV, Pages: 58-64, ISSN: 0927-7757
Shamsuddin S-R, Ho KKC, Lee K-Y, et al., 2012, Carbon fibres: Properties, testing and analysis, Wiley Encyclopedia of Composites, 5 Volume Set, Editors: Nicolais, Borzacchiello, Lee, Publisher: Wiley, ISBN: 9780470128282
Written by prominent international experts from industry and academia, the Wiley Encyclopedia of Composites, Second Edition presents over 260 new and revised articles addressing the new technological advances in properties, processing, ...
Shamsuddin S-R, Ho KKC, Ng P, et al., 2011, Synergy of matrix and fibre modification on adhesion between carbon fibres and poly(vinylidene fluoride), COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 72, Pages: 56-64, ISSN: 0266-3538
Ho KKC, Shamsuddin S-R, Laffan M, et al., 2011, Unidirectional carbon fibre reinforced poly (vinylidene fluoride): Impact of atmospheric plasma on composite performance, COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING, Vol: 42, Pages: 453-461, ISSN: 1359-835X
Ho KKC, Shamsuddin S-R, Riaz S, et al., 2011, Wet impregnation as route to unidirectional carbon fibre reinforced thermoplastic composites manufacturing, PLASTICS RUBBER AND COMPOSITES, Vol: 40, Pages: 100-107, ISSN: 1465-8011
Shamsuddin S-R, Ho KKC, Lamoriniere S, et al., 2010, Impact of In-Line Atmospheric Plasma Fluorination of Carbon Fibers on the Performance of Unidirectional, Carbon Fiber-Reinforced Polyvinylidene Fluoride, Session on Thermoplastic Composite Materials (THEPLAC 2009) held at the 17th International Conference on Composite Materials, Publisher: WILEY-BLACKWELL, Pages: 86-97, ISSN: 0730-6679
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