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Contribution a l'usinage des materiaux composites ArchiMer
Guegan, P; Lemaitre, F; Hamann, J.
While machining is generally to be avoided in the fabrication of components with composite materials, nevertheless many parts require some machining, drilling or milling after moulding. Machining of these materials involves the risk of damage in the machined region. It is therefore important to study the possible sources of damage and to quantify their extent for different drilling and milling operations.
Tipo: Text Palavras-chave: Damage; Drilling; Ship technology; Composite materials; Usinage; Matériau composite.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1080.pdf
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Elements sur le comportement experimental et numerique de la structure d'un voilier de 7m70 en cours de navigation ArchiMer
Baley, C; Cailler, M.
The experimental sailing boat "Mesure Z," has been designed and built on behalf of F.I.N., (the French marine industry association). This research project has been managed in close collaboration with Bureau Veritas, Ifremer and the CEA. The GRP hull is similar to that of a production sailing boat, but it has been designed as a transducer-hull, i.e. a hull sufficiently sensitive to allow measurements (hull strains, acceleration, spar loads, etc), due to its structure and mechanical characteristics. This paper presents different aspects of the experimental boat, the materials and structure of the transducer-hull, and the behaviour of the central and bow regions of the hull during sailing.
Tipo: Text Palavras-chave: Finite element method; Navigation; Measurement; Boating; Sailing ships; Mechanical properties; Ship technology; Composite materials; Navigation; Comportement mécanique; Eléments finis; Mesure; Matériau composite; Voilier.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1073.pdf
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Endommagement mecanique de materiaux composites. Role sur les proprietes hygrothermiques ArchiMer
Perreux, D; Suri, C; Varchon, D; Oytana, C.
The mechanical behaviour of polymer based glass fibre composites depends on the damage level and the amount of moisture present. Two anelastic damage models, both adapted to the mechanical properties of epoxy and polyester matrix polymers, are proposed. A coupling effect between the kinetics of damage and moisture level is shown.
Tipo: Text Palavras-chave: Moisture; Damage; Modelling; Ship technology; Mechanical properties; Composite materials; Humidité; Endommagement; Modélisation; Comportement; Matériau composite.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1062.pdf
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Evolution des propriétés mécaniques de matériaux composites verre/polyester gelcoates en milieu marin ArchiMer
Castaing, P; Tsouvalis, N; Lemoine, Lionel.
Glass-fiber reinforced polyester composites with gelcoat are widely used in nautical construction despite the lack of knowledge concerning their durability when immersed in water. This study deals especially with the influence of the osmotic process of degradation on the evolution of the mechanical properties of orthotropic materials, subjected to accelerated ageing tests. This evolution is experimentally evaluated by performing a non destructive test procedure, the vibrational modal analysis, whose results are additionally confirmed by quasi-static mechanical tests (bending and shear). Although gelcoat blistering has no effect on the mechanical properties of the structure, considerable changes are observed in the elastic moduli and in the ultimate...
Tipo: Text Palavras-chave: Osmosis; Aging; Mechanical properties; Glass reinforced plastics; Fibre glass; Composite materials; Durabilité; Propriétés mécaniques; Analyse modale; Osmose; Vieillissement; Gelcoat; Polyester; Matériau composite.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1058.pdf
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Innovations and technical-economic aspects of structural and non-structural applications of composite materials on large passenger vessels and merchant ships. ArchiMer
Maccari, A; Farolfi, F.
Considerable interest is presently being shown in research, design and practical application of composite materials within Fincantieri Merchant Shipbuilding Division. This paper is intended to discuss the state-of-the-art and the innovations in hull, outfitting and accommodation applications, where traditional steel or light alloy can be successfully replaced by composites. The impact on design and production is outlined, with an overview of the economic effects of these materials on technology, production and safety requirements, which remain an open subject for the future possible developments.
Tipo: Text Palavras-chave: Safety devices; Accommodation; Ship technology; Ship design; Ship hulls; Composite materials; Economie; Sécurité; Cabine; Equipement; Coque; Matériau composite.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1053.pdf
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Les essais mécaniques a la DCN, de l'eprouvette aux structures ArchiMer
Hoarau, P.
In order to correctly dimension surface ship hulls made of organic matrix composites, the DCN carries out different kinds of mechanical testing: Quasi-static and dynamic. Sample size varies from small scale (for material selection) to large scale (for the choice of assembling technology between deck and hull). As often as possible, the DCN performs correlation studies between its experiments and existing numerical tools, in order to improve the accuracy of computer modelling.
Tipo: Text Palavras-chave: Tests; Materials testing; Ship technology; Composite materials; Essai sur tronçon; Essai mécanique; Structure sandwich; Matériau composite.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1083.pdf
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Materiaux composites courants: Tenue au feu ArchiMer
Croquette, Jean; Baudin, M.
In the national naval composites project, several series of fire tests have been carried out on epoxy glass pipes and different structural materials commonly used in naval construction. This paper describes the materials tested and the procedures chosen to evaluate the fire reaction properties: flammability (M classification), smoke emission (F classification), and the fire resistance (IMO A 517(13)). The conclusions are given for both the testing procedures and the performance of the composite materials.
Tipo: Text Palavras-chave: Pipes; Fire; Tests; Materials testing; Ship technology; Composite materials; Tuyauteries; Sandwich; Tenue au feu; Matériau composite.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1047.pdf
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Modelisation numerique du flambage de panneaux sandwich raidis ArchiMer
Batoz, J; Quesnel, T.
This paper presents a numerical method for the buckling analysis of stiffened sandwich panels for ship building with composite materials. The formulation of a multi-layered quadrilateral finite element of a plane shell including transverse shear effects is presented. Some classical tests allow the performance of this element to be evaluated for composite plates. Then an explanation is given for a method used for analyzing the buckling of panels.
Tipo: Text Palavras-chave: Ship technology; Composite materials; Modelling; Mathematical models; Numerical analysis; Eléments finis; Plaque coque; Flambage; Structure sandwich; Matériau composite.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1074.pdf
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Non-conventional vessels in Scandinavia made of composite materials. ArchiMer
Gullberg, O.
This paper presents the background to the development of composite materials in marine structures in the Scandinavian countries. The very first vessel constructed in composite materials in 1974 used a special sandwich technique, GRP sandwich, developed in Sweden. Since the the GRP sandwich technique has been the only ship hull construction method used in the Scandinavian countries. The construction method is briefly described, together with the material used. In the second part of the paper examples of the different types of vessels under construction are presented. Finally, in the conclusion some ideas of future development are outlined.
Tipo: Text Palavras-chave: Hovercraft; Ship technology; Ship hulls; Ship design; Composite materials; NES; Coussin d'air; MCMV; Sandwich GRP; Matériau composite.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1052.pdf
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The evolution of composite materials in submarine structures. ArchiMer
Lemiere, Y.
Since the sixties, the amount of composite structures on submarines has increased continuously. The main reasons are their low apparent weight in water, good behaviour in a marine environment, excellent mechanical properties and acoustic transparency. The new applications required the use of prepreg. Relevant processes had to be adapted to the large dimensions and thickness of the structures. Future applications will be concerned with both structures and internal equipment. A lively debate is now in progress over whether the successor to high yield strength steels for hull structures will be titanium or composite materials.
Tipo: Text Palavras-chave: Submarines; Ship technology; Composite materials; Structure; Sous marin; Matériau composite.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1077.pdf
Registros recuperados: 10
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