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| Registros recuperados: 53 | |
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| Gandia,Rômulo M.; Gomes,Francisco C.; Corrêa,Andréa A. R.; Rodrigues,Maykmiller C.; Marin,Diego B.. |
| ABSTRACT The need for treated water is essential for life. With the constant increase in population, the most common way to purify surface water is through conventional water treatment plants (WTPs). The high volume of residue (sludge) generated in this process is most often returned to the catchment site, negatively affecting the ecosystem. The sludge of WTPs is similar to soil because it is composed of inorganic solids. Adobe is a construction material made from water and soil without the burning process, so it is considered sustainable, recyclable, and energy-efficient and can be stabilized with various materials. Therefore, the objective of this work is to develop adobes using the sludge of WTPs and to analyse their physical, mechanical and thermal... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Wastewater treatment plants; Building materials; Sustainability; Composite materials; Waste in construction. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000600684 |
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| Martin, Nicolas; Davies, Peter; Baley, Christophe. |
| This paper presents results from an experimental study of three types of non-woven preforms (needlepunched, spunlaced and mat manufactured using a paper-making process) intended as composite reinforcement. These are potentially very attractive for transport applications. First, the influence of processing on elementary fiber tensile properties is shown to be limited. Then the preforms are evaluated in polypropylene matrix composites and mechanical properties are determined. The structure of non-woven reinforcements is strongly dependent on the manufacturing route. By varying the fiber content it is shown that the most efficient reinforcement for flax fibers is the mat produced by paper processing. The new spunlaced reinforced composites are shown to have... |
| Tipo: Text |
Palavras-chave: Flax fibers; Non-wovens; Composite materials; Polypropylene. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00307/41798/41241.pdf |
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| Baral, N; Guezenoc, H; Davies, Peter; Baley, C. |
| This paper presents test results from mode I interlaminar fracture and transverse tensile tests on unidirectional carbon/epoxy composites used in racing yacht construction. Fibre modulus has been varied from 380 to 640 GPa. PAN fibre reinforced composite properties, delamination resistance (G(Ie) and G(Ip)) and transverse strain to failure, decrease as fibre modulus increases. Composites based on the highest modulus pitch fibres show higher transverse failure strains than the highest modulus PAN fibre composites. A distinct failure mechanism, crack propagation within the fibres, was observed for the pitch based reinforcement. The transverse tensile tests allowed transverse fibre modulus to be estimated as 11.5 GPa for the PAN and 9 GPa for the pitch... |
| Tipo: Text |
Palavras-chave: Carbon fibre; Fracture; Deformation; Delamination; Composite materials. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-3723.pdf |
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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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| Martin, Nicolas; Davies, Peter; Baley, Christophe. |
| The industrial production of flax fibers yields two fibrous products: scutched fibers are valuable for their length, fineness and cleanness, while tows are entangled, impure and are low-priced. There is a need for technical data to compare these two kinds of fibers beyond the difference of appearance, and to assess their potential as composite material reinforcements. In this work, we have compared the properties of scutched flax and flax tows from the same batch. The morphology was first assessed by measuring the length, cleanness and fineness of fiber bundles. The tensile properties of single fibers and of unidirectionally reinforced epoxy composites were then measured. The results show that the morphology of flax tows is different from but close to the... |
| Tipo: Text |
Palavras-chave: Flax fibers; Scutching; Flax by-products; Composite materials. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00203/31403/41240.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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| Martin, Nicolas; Mouret, Nicolas; Davies, Peter; Baley, Christophe. |
| The flax quality required for composite applications is not yet well established. Retting is one of the steps that are not well defined for these applications, and is a critical parameter during flax production. In this study, the influence of the degree of retting of flax on the properties of short flax fiber/polypropylene composites has been assessed. First, the degree of retting of gradually retted flax was measured by both qualitative and quantitative experimental techniques. In addition, water sorption studies were performed. Furthermore, tensile tests were carried out on both single fiber and injected composite materials. The microstructure of the composites was analyzed by scanning electron microscopy and X-ray microtomography. Single fiber and... |
| Tipo: Text |
Palavras-chave: Flax fibers; Dew-retting; Composite materials; Polypropylene; Injection molding. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00160/27076/25475.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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| Registros recuperados: 53 | |
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