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| 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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| Messager, Tanguy; Pyrz, Mariusz; Gineste, Bernard; Chauchot, Pierre. |
| This paper deals with the optimal design of deep submarine exploration housings and autonomous underwater vehicles. The structures under investigation are thin-walled laminated composite unstiffened vessels. Structural buckling failure due to the high external hydrostatic pressure is the dominant risk factor at exploitation conditions. The search of fiber orientations of the composite cylinders that maximize the stability limits is investigated. A genetic algorithm procedure coupled with an analytical model of shell buckling has been developed to determine numerically optimized stacking sequences. Characteristic lamination patterns have been obtained. FEM analyses have confirmed the corresponding significant increases of buckling pressures with respect to... |
| Tipo: Text |
Palavras-chave: Experimental results; Optimal design; Buckling; Lamination; Cylinder; Composite. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/2002/publication-759.pdf |
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| Messager, Tanguy; Chauchot, Pierre; Bigourdan, Benoit. |
| This numerical study deals with the stiffened composite underwater vessel design. The structures under investigation are laminated cylinders with rigid end-closures and inter-nal circumferential and longitudinal unidirectional composite stiffeners. Structural buckling induced by the high external hydrostatic pressure is considered as the major failure risk. An optimization design tool has been developed to obtain the reinforcement definition which maximizes the limit of stability: an analytical model of cylindrical composite shell buckling has been coupled to a genetic algorithm procedure. The numerical optimization tests carried out corroborate design tendencies validated previously by experiments. |
| Tipo: Text |
Palavras-chave: Optimization; Buckling; Stiffeners; Cylinders; Composite. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/acte-6474.pdf |
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