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Carbon/polyamide 6 thermoplastic composite cylinders for deep sea applications 5
Arhant, Mael; Briancon, Christophe; Burtin, Christian; Davies, Peter.
The composite materials used at sea are today nearly all based on thermoset resins (polyester, epoxy). However, there is an increasing number of thermoplastic matrix polymers available on the market (PP, PA, PPS, PEEK…), which offer possibilities for forming by local heating, attractive mechanical properties and the potential for end of life recycling. The aim of this study was to design, manufacture and test thermoplastic composite pressure vessels for 4500 meter depth, in order to establish a technical, economic and ecological assessment of the use of these materials to replace traditional composites underwater. First, finite element calculations have been carried out to optimize the stacking sequence with respect to the external pressure and buckling...
Tipo: Text Palavras-chave: Thermoplastic; Polyamide; Carbon fibres; Buckling; Implosion.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00476/58742/61268.pdf
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Delamination behaviour of very high modulus carbon/epoxy marine composites 5
Baral, N; Davies, Peter; Baley, C; Bigourdan, Benoit.
This paper presents a study of the delamination resistance Of unidirectional carbon fibre reinforced epoxy composites manufactured from prepreg for racing yacht mast applications. Fibre modulus has been varied from 290 to 640 GPa. Two manufacturing methods, oven cure under vacuum and autoclave, were used to produce samples. Results show that delamination resistance tinder mode I and mixed mode loading decreases as fibre modulus increases. The manufacturing route affects G, values by modifying interlaminar layer geometry but does not change the trend of lower toughness with increasing fibre modulus. For the pitch composites crack propagation is observed within the fibres, in addition to more usual matrix and interface cracking. For the very high modulus...
Tipo: Text Palavras-chave: Mixed mode; Fracture toughness; Polymers; Carbon fibres; Delamination.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-3772.pdf
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Effect of sea water and humidity on the tensile and compressive properties of carbon-polyamide 6 laminates 5
Arhant, Mael; Le Gac, Pierre-yves; Le Gall, Maelenn; Burtin, Christian; Briancon, Christophe; Davies, Peter.
Thermoplastic matrix carbon fibre composites offer considerable potential for underwater applications. Various material options exist but there are questions concerning the tension/compressive behaviour and water sensitivity of the less expensive polymers (e.g. polyamides) for these applications. The aim of the current work is to model water diffusion and its effect on the mechanical properties of thick carbon fibre reinforced polyamide-6 composite cylinders immersed in sea water for deep sea applications. To provide the data for such a model, thin specimens (2 mm thick) have been aged under different humidity conditions and tested in tension and compression. As water enters the composite, a significant reduction in the laminate properties is observed. An...
Tipo: Text Palavras-chave: Thermoplastic; Carbon fibres; Environmental degradation; Mechanical testing.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00368/47937/47971.pdf
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