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| Registros recuperados: 44 | |
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| 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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| Remen, W. |
| This paper is an overview of what has been done in the area of FRP-sandwich in the maritime industry over the last 15 years. The advantages of building in FRP-sandwich will be discussed with regards to past production methods and applications into other markets. Since the late sixties the development and use of light and strong construction materials and new construction methods has increased. The use of Fibre Reinforced Plastic (FRP)-sandwich has successfully been introduced to a variety of areas. Barracuda Technologies has over the years tried to fullfil customers' demands by developing new and better foam cores and adhesives and new improved production methods. The result of this is that we now supply Divinycell, a sandwich core, and Divilette, an... |
| Tipo: Text |
Palavras-chave: Hovercraft; Ship technology; Composite materials; Navires anti mines; Embarcations commerciales rapides; Sandwich FRP Divinycell. |
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/1992/acte-1075.pdf |
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| Hermundstad, O; Moan, T; Nordal, H. |
| This paper deals with the structural analysis of transverse frames and bulkheads in sandwich catamarans. Finite element analyses of a frame and a bulkhead have been carried out, and the results are compared to those obtained from a finite element model of the entire craft. The frame and the bulkhead have been analysed with five different boundary conditions. Four idealized load combinations have been applied, and it is demonstrated that transverse frame models can give quite inaccurate results. This is due to the difficulty in deciding the relevant support springs to represent the interaction between the actual frame and the other part of the structure. When designing a new type of vessel, it is recommended to carry out a global finite element analysis... |
| Tipo: Text |
Palavras-chave: Hovercraft; Ship technology; Composite materials; Analyse par éléments finis; Structure sandwich; Catamaran à coussin d'air. |
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/1992/acte-1076.pdf |
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| Jeannetaud, P; Krawczak, P; Bequignat, R; Pabiot, J; Bord, C; Vancon, M; Bard, M; Lemascon, A. |
| Fractography deals with the microscopic study of the fracture surfaces of a structure in order to define the initiation and the propagation of the damage and then the failure history of the structure (stress, environment ...). Today, we are able to identify the causes of the failure of metallic parts based on pictures of typical fracture surfaces, but there is nothing similar for composite materials. However, the increasing amount of literature devoted to fractography, as well as the constitution of "brain storming" groups on a European level confirm scientific interest in this fracture analysis mode that permits a better understanding of the existing relationship between the material's microscopic structure and its macroscopic mechanical behaviour. In... |
| Tipo: Text |
Palavras-chave: Fractures; Damage; Failures; Ship technology; Composite materials; Endommagement; Rupture; Défaillance; Analyse d'avaries; Fractographie. |
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/1992/acte-1060.pdf |
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| Simeone, M; Davies, Peter. |
| In the last two decades, the Finite Element Method has been growing as a powerful tool for the structural analysis of the ship hull, but in nautical construction the use of this method has been related mainly to steel or aluminium hulls. In a metallic structure the material is homogeneous and isotropic and the plate, or the stiffened plate, behaves as an orthotropic plate, which means orthogonally anisotropic with three mutually perpendicular planes of symmetry; on the contrary, when considering a composite hull panel the scheme ought to be different, because there arise two different problems, which ensue from the structural characteristics of the composite sandwich panel. Firstly, the Element Stiffness Matrix must take into account the natural anisotropy... |
| Tipo: Text |
Palavras-chave: Ship technology; Ship design; Ship hulls; Composite materials; Coque en composite; Sandwich; Eléments finis. |
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/1992/acte-1072.pdf |
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| Lelan, J; Parneix, P; Gueguen, P. |
| Composite materials offer many advantages for the construction of metal hull ships' superstructures (lower weight, higher resistance to fire compared to aluminium alloy, integration of specific functions to the material ...). DCN Lorient has the most of these characteristics to build the "La Fayette" class frigate superstructures. This paper discusses the developments that were undertaken for the choice and validation of the technical solutions retained and particularly the connection to a metal hull. The difficulties to be resolved during the manufacturing and assembly of the superstructures on board the prototype are also discussed. This concept can be applied to other types of ships with metal hulls, by adapting the technological choices to the design... |
| Tipo: Text |
Palavras-chave: Joints; Ship design; Ships; Ship technology; Composite materials; Assemblage acier/composite; Composite; Navire; Superstructure. |
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/1992/acte-1067.pdf |
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| Darold, L; Blanco, E. |
| One of the major defects that can be found on composite sandwich structures is poor bonding of the core on the exterior skins, particularly with the technique of bonding under vacuum. Therefore, we have looked at all the possible means of detecting these bonding defects, with two objectives: to be able to control integrally a piece of large dimensions, and to be able to control the piece in the course of manufacturing, that is to say after the bonding on the first skin. All of the non-destructive test methods now known have therefore been tested, and in particularly infrared thermography, ultrasonic control, and acoustic methods. This study, carried out in collaboration with the CETIM, the STCAN, Aerospatiale and other laboratories and companies without... |
| Tipo: Text |
Palavras-chave: Adhesion; Ship technology; Composite materials; Contrôle non destructif; Structure sandwich. |
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/1992/acte-1049.pdf |
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| Registros recuperados: 44 | |
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