Back SearchTitle: INFLUENCE OF HYBRIDISATION AND TEST GEOMETRY ON THE IMPACT RESPONSE OF GLASS-FIBRE-REINFORCED LAMINATED COMPOSITES
Page Range: p.259-272
Author(s): Schrauwen B; Bertens P; Peijs T
File size: 161K
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Issue Year: ppc
Volume: 10
Issue No: No. 4
Abstract
Falling weight impact tests were carried out on glass fibre reinforced laminates and E-glass/Dyneema (high performance polyethylene fibre) hybrid laminates to determine the influence of hybridisation and test geometry on their impact responses. Tests included falling weight impact tests to determine penetration energy and experiments to determine the effect of hybrid construction on damage development. The results of these tests indicated that in order to fully utilise the potential of high performance PE fibres, they should be located on the tensile side of an impacted laminated, and that the geometrical test conditions are such that large bending deformations are allowed. 17 refs.
Title: REINFORCEMENT OF DAMAGED CONCRETE COLUMNS BY FILAMENT WINDING OF THERMOPLASTIC COMPOSITES
Page Range: p.273-280
Author(s): Friedrich K; Glienke N; Floeck J; Haupert F; Paipetis S A
File size: 253K
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Issue Year: ppc
Volume: 10
Issue No: No. 4
Abstract
This paper describes the failure of composite reinforced concrete columns using the thermoplastic filament winding technique. Details are given of a study to compare various composite systems with different fibres (E-glass and carbon) in two different thermoplastic matrices (PPS and PEEK) for their strengthening efficiency for wrapped concrete columns. Factors investigated included load-bearing capacities, and improvements in strength properties by use of multiple layers of reinforcement and wrap thicknesses. Pre-damaged samples with the same amount of reinforcement were shown to be 4.5 times stronger than the undamaged, non-reinforced concrete. 9 refs.
Title: POLYPROPYLENE AND ALIPHATIC POLYESTER FLAX FIBRE COMPOSITES
Page Range: p.281-290
Author(s): Hodzic A; Shanks R A; Leorke M
File size: 184K
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Issue Year: ppc
Volume: 10
Issue No: No. 4
Abstract
Polypropylene and aliphatic polyester flax fibre composites were prepared from hydrophobic and hydrophilic PP with and without silane surface treated flax fibres. Other comparable biodegradable composites have been prepared from poly(lactic acid) and poly(ethylene succinate). The polar polymers were found to provide better wetting of the surface of the flax, regardless of the surface treatment. DSC was used to study the crystallisation and melting of the composites compared with the pure polymers. Surface wetting of the fibres and morphology of the composites was studied by SEM and optical microscopy, and mechanical properties were studied using dynamic mechanical analysis. It was found that the relatively low density flax fibres provided efficient reinforcement compared with that expected from analogous glass fibre composites and the influence of the transcrystalline interphase on the dynamic storage modulus was found to be important. 17 refs.
Title: NANOSTRUCTURED SILVER/POLYSTYRENE COMPOSITE FILM: PREPARATION AND ULTRAFAST THIRD-ORDER OPTICAL NONLINEARITY
Page Range: p.291-298
Author(s): Zeng R; Wang S F; Liang H C; Rong M Z; Zhang M Q; Zeng H M; Gong Q H
File size: 119K
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Issue Year: ppc
Volume: 10
Issue No: No. 4
Abstract
Silver nanoparticles synthesised by water-in-oil microemulsions are found to be well re-dispersed in chloroform after surface modification because of the strong interaction between silver and the solvent. As a result of this finding, nanocomposite films consisting of nanometer silver particles homogeneously distributed in a transparent polystyrene matrix were prepared by means of solution mixing and static casting using chloroform as the solvent. XPS results indicated no obvious interaction between nanosilver and polystyrene matrix. The third-order nonlinear optical susceptibility of the nanocomposite film was found to increase with increasing particle size, as measured by time-resolved femtosecond optical Kerr effect experiments. Since the size, shape and microstructure, aggregated morphology and volume fraction of the nanoparticles can be simultaneously controlled by this approach, the optical properties of the nanocomposites can be adjusted accordingly. 26 refs.
Title: STUDIES ON MECHANICAL PROPERTIES OF DISCONTINUOUS GLASS FIBER/CONTINUOUS GLASS MAT/POLYPROPYLENE COMPOSITE
Page Range: p.299-306
Author(s): Zhou X; Qunfang L; Dai G
File size: 218K
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Issue Year: ppc
Volume: 10
Issue No: No. 4
Abstract
Mechanical properties of discontinuous glass fibre/continuous glass fibre mat/PP composites were investigated, with particular reference to stiffness, heat and creep resistance. The suitable content and length of discontinuous glass fibre was determined. Functionalised PP was used to improve the mechanical properties of the systems. The effects of glass mat areal weights and matrix resin on the mechanical properties of the composites, was also investigated. 15 refs.
Title: TENSILE BEHAVIOUR OF FUNCTIONALLY GRADED BRAIDED CARBON FIBRE/EPOXY COMPOSITE MATERIAL
Page Range: p.307-314
Author(s): Huang Z-M; Wang Q; Ramakrishna S
File size: 137K
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Issue Year: ppc
Volume: 10
Issue No: No. 4
Abstract
A functionally graded material (FGM) was developed using tubular braided carbon fibre fabric reinforced epoxy composites. An investigation was carried out into the tensile properties of the developed FGM, and the relationship between the tensile properties of the FGM rods with varying braiding angles and that of the corresponding non-FGM constant braiding angle rods was established. It was shown that both the tensile behaviour and modulus decreased as the angle of braiding increased, and that the tensile strength of an FGM specimen was a function of its largest braiding angle, and was higher than that of a non-FGM specimen with a braiding angle equal to this largest braiding angle. 16 refs.
Title: CROSS-LINKED POLYAMIDES
Page Range: p.315-324
Author(s): Patel H S; Patel V C
File size: 100K
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Issue Year: ppc
Volume: 10
Issue No: No. 4
Abstract
This paper describes the synthesis and characterisation of crosslinked polyimides containing a s-triazine ring, and glass fibre reinforced composites, using the in-situ Diels-Alder intermolecular addition polymerisation of 2,4,6-tris(2-furanyl methyl imino)-1,3,5-triazine and bis(maleimide) compounds. All the poly(imino -s-triazine imide)s were characterised by FTIR and thermogravimetry. The resulting composites were characterised by mechanical properties. 15 refs.