Characterisation of sol-gel derived alumina-silica matrices for continuous fibre reinforced composites

Continuous fibre-reinforced composites have significant industrial importance and usage. However, they are limited by design considerations and high-cost manufacturing operations. This article presents a way forward to utilize Fused Deposition Modelling – a 3D printing technique – to manufacture continuous carbon fibre-reinforced thermoplastics. Several parameters including number of reinforced layers, material impact and interlayer gap have been investigated and optimized using response surface method. Successful incorporation of modified novel nozzle design in a dual nozzle setup resulted in the realization of controlled manufacturing of continuously reinforced composites leading to reinforced yet smooth surface finished samples. Several samples were made, and mechanical testing, parameter optimization, strength calculations and fracture analysis were carried out. For polylactic acid (PLA), tensile strength of 112 MPa and flexural strength of 164 MPA were achieved – an almost 3 times increase from pure PLA printing. The approach presented in this article can forward continuous fibre-reinforced composites for industrial usage with its controlled fibre layup and programmable thread orientation features.

Download Full-text

Structure reorganization during the rheological characterization of continuous fibre-reinforced composites in plane shear

Composites Part A Applied Science and Manufacturing ◽

10.1016/1359-835x(95)00049-8 ◽

1996 ◽

Vol 27 (4) ◽

pp. 279-286 ◽

Cited By ~ 14

Author(s):

J.A. Goshawk ◽

R.S. Jones

Keyword(s):

Reinforced Composites ◽

Rheological Characterization ◽

Plane Shear ◽

Continuous Fibre ◽

Fibre Reinforced Composites

Download Full-text

Light transmittance of continuous fibre-reinforced composites: Analysis, model experiment and parametric study

Philosophical Magazine B ◽

10.1080/13642819808206725 ◽

1998 ◽

Vol 78 (1) ◽

pp. 37-52 ◽

Cited By ~ 26

Author(s):

Hisayoshi Iba ◽

Yutaka Kagawa

Keyword(s):

Parametric Study ◽

Model Experiment ◽

Light Transmittance ◽

Reinforced Composites ◽

Analysis Model ◽

Continuous Fibre ◽

Fibre Reinforced Composites

Download Full-text

Synthesis and Electrophoretic Deposition of Mullite Precursor Sols for the Oxidation Protection of Carbon Fibre Reinforced Composites

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.45.1281 ◽

2006 ◽

Vol 45 ◽

pp. 1281-1286 ◽

Cited By ~ 2

Author(s):

Kirsten Moritz ◽

R. Herbig ◽

Tanja Damjanović ◽

Christos Argirusis ◽

Günter Borchardt

Keyword(s):

Carbon Fibre ◽

Electrophoretic Deposition ◽

Ph Value ◽

Sol Gel ◽

Reinforced Composites ◽

Oxidation Protection ◽

Synthesis Conditions ◽

Mullite Coatings ◽

Electrokinetic Sonic Amplitude ◽

Fibre Reinforced Composites

The preparation of mullite coatings for the oxidation protection of carbon fibre reinforced composites using a combination of sol-gel synthesis and electrophoretic deposition (EPD) has been investigated. Mullite precursor sols were synthesised by controlled hydrolysis and condensation reactions of the metal alkoxides TEOS (tetraethoxysilane) and Al(OBus)3 (aluminiumtri-sec-butylate). The structure and properties of the mullite precursor were strongly influenced by the synthesis parameters, especially by the water to TEOS ratio (rw/Si) and the pH value of the water. A variety of synthesis conditions was tested for optimising the mullite precursor sols regarding their suitability for the electrophoretic deposition. The electrokinetic behaviour of the sols and the charging of the sol particles which is necessary for a successful EPD were investigated by measurements of the Electrokinetic Sonic Amplitude (ESA signal). 29Si CP/MAS NMR measurements were used to get information about the coordination of the silicon and the homogeneity of the Al/Si distribution in the precursors. Heat-treated samples were characterised by X-ray diffraction for investigating the mullite formation. Coatings prepared by EPD and sintering at 1300 °C in Ar enabled an effective oxidation protection in the temperature range 1200 °C ≤ T ≤ 1550 °C.

Download Full-text

The effects of different fibre packing geometries on the transverse matrix strain magnification and fibre strain reduction in uniaxially aligned continuous fibre-reinforced composites

Journal of Composite Materials ◽

10.1177/0021998316631701 ◽

2016 ◽

Vol 50 (29) ◽

pp. 4159-4170 ◽

Cited By ~ 1

Author(s):

Maina Maringa ◽

LM Masu

Keyword(s):

Fibre Volume ◽

Reinforced Composites ◽

Bond Failure ◽

Volume Fractions ◽

Continuous Fibre ◽

Fibre Strain ◽

Square Array ◽

Longitudinal Strains ◽

Fibre Packing ◽

Fibre Reinforced Composites

Expressions for transverse matrix strain magnification and fibre strain reduction are derived for square and hexagonal fibre array reinforced composites. Respective transverse matrix and fibre strain magnification and reduction, for the square arrays are shown to be higher for all reinforcing fibre volume fractions than those for the hexagonal arrays. The respective magnification and reduction of the transverse matrix and fibre strains are shown to decrease with increasing values of the ratio of elastic modulus ( Em/ Ef) for both reinforcing fibre arrays. The magnified transverse matrix strains in axially loaded longitudinally aligned continuous fibre-reinforced composites are shown to be higher than the applied longitudinal strains for all square array reinforcing fibre volume fractions and for all hexagonal array reinforcing fibre volumes fractions above 31%. This raises possibilities of longitudinal matrix splitting before interfacial bond failure and transverse matrix failure, in a strain based rather than stress-based failure mode.

Download Full-text