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Mechanical properties of composites based on low styrene emission polyester resins for marine applications ArchiMer
Baley, Christophe; Perrot, Yves; Davies, Peter; Bourmaud, Alain; Grohens, Yves.
Glass fibre reinforced polyester composites are used extensively for hulls and decks of pleasure boats. Boat-builders must optimise manufacturing technology, not only with respect to mechanical properties but also limiting volatile organic compounds (VOC) emissions. One way to achieve this is through modified polyester resin formulations such as low styrene content, low styrene emission or combinations of these. The resin matrix selection procedure is based on design specification (mechanical behaviour) but also manufacturing requirements and cost considerations. For this application post-cure is rarely used so it is important to optimise curing conditions. In this study the influence of the curing cycle on mechanical properties was examined first for two...
Tipo: Text Palavras-chave: Mat; Unidirectional; Glass fibres; Styrene emission; Mechanical properties; Transverse tensile; Unsaturated polyester; Composite materials.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2320.pdf
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Transverse properties of carbon fibres by nano-indentation and micro-mechanics ArchiMer
Maurin, R; Davies, Peter; Baral, N; Baley, C.
In this study the transverse modulus of three high modulus (M40, M46 and K63712) carbon fibres has first been measured directly by nano-indentation measurements. Transverse tensile tests on unidirectional epoxy composites were then performed, and the comparison was made between transverse fibre properties from indentation and those needed to obtain the measured transverse composite modulus using micromechanics expressions. The latter tended to underestimate values from indentation, by up to 36%, and reasons for this are discussed. Values of transverse fibre modulus determined by both methods decrease as longitudinal fibre modulus increases.
Tipo: Text Palavras-chave: Transverse tensile; Nano indentation; Epoxy; Carbon fibre.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4502.pdf
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Transverse tensile behaviour of unidirectional plies reinforced with flax fibres ArchiMer
Baley, C; Perrot, Yves; Busnel, F; Guezenoc, H; Davies, Peter.
Flax provides a renewable source of fibres with good mechanical properties, which justifies its use as a reinforcement for polymers. Composite materials made with flax which has only undergone mechanical treatments (stripping followed by combing) results in the presence of bundles of fibres. When a unidirectional flax/polyester ply is loaded in transverse tension the damage mechanisms are complex; cracks develop in the matrix, and at the fibre/matrix interface, but they also appear within the fibres themselves and in the lamellae within the fibre bundles. This emphasises the highly anisotropic nature of these flax fibres, whose average longitudinal Young's modulus is 59 GPa and whose transverse modulus is estimated here to be 8 GPa. (c) 2006 Elsevier B.V....
Tipo: Text Palavras-chave: Unidirectional; Transverse tensile; Polyester; Glass; Flax; Composite materials.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-6362.pdf
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