Relevant bibliographies by topics / Fibre continue

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Fibre continue'

Author: Grafiati
Published: 4 June 2021
Last updated: 8 February 2022

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Journal articles on the topic "Fibre continue"

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Markarian, Jennifer. "Long fibre reinforced thermoplastics continue growth in automotive." Plastics, Additives and Compounding 9, no. 2 (March 2007): 20–24. http://dx.doi.org/10.1016/s1464-391x(07)70025-9.

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O RUAN, FANGTAO, CHENGLONG XIA, LI YANG, ZHENZHEN XU, and FEIYAN TAO. "Effect of filaments diameter on the mechanical properties of wrap hybrid CFRP." Industria Textila 72, no. 02 (April 22, 2021): 144–48. http://dx.doi.org/10.35530/it.072.02.1733.

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In this paper, the vine-like structure of carbon bundles was designed through polyester fibre wrapping for better mechanical properties. The effect of wrapped hybrid structure and diameters of polyester fibre on the mechanical properties of carbon-polyester fibre/epoxy unidirectional composites was investigated experimentally. Five kinds of specimens with different polyester filament diameters were produced. The impact, tensile and unidirectional compressive properties of WHC (Wrap Hybrid Composite) were measured. Experimental results show that: it can be developed with strength and toughness properties far superior to those of their constituents, the compressive fracture morphology of specimens indicated that the fracture patterns of composites depend on wrapped hybrid structure, polyester fibres with higher tensile strengths provide better impact resistance, while thinner wrapping fibres enhance the compression properties of the composite material more effectively. The diameter of the wrapping fibre should be optimized as per the application of the composite material. The vine-like structure can provide a new design method for the structural design of continue fibre reinforced composite materials.
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Fahey, A. J., J. M. Brameld, T. Parr, and P. J. Buttery. "The effect of maternal undernutrition on muscle fibre type in the newborn lamb." Proceedings of the British Society of Animal Science 2003 (2003): 60. http://dx.doi.org/10.1017/s1752756200012199.

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Muscle fibre type can influence meat quality (Maltinet al1997). Muscle fibre formation occurs during gestation and in the sheep the total number of fibres in a muscle is essentially fixed at birth. (Ashmereet al1972). Postnatal growth of muscle is entirely due to elongation and widening of the existing muscle fibres. Therefore the gestational period is important in the long-term growth potential of the animal. By investigating changes in muscle fibre type, the aim of this study was to test the general hypothesis that the poor carcass quality sometimes seen in ruminant animals may be due to poor nutrition at strategic time points during the animal’s development. As agricultural practices continue to become more extensive, variation in the nutrient supply to the animal is becoming more common. Therefore it is important to understand the effect of any changes in nutrient supply to the mother, during gestation on the subsequent muscle development of the fetus and ultimately the effects on meat quality.
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Agrell, Erik, Alex Alvarado, and Frank R. Kschischang. "Implications of information theory in optical fibre communications." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374, no. 2062 (March 6, 2016): 20140438. http://dx.doi.org/10.1098/rsta.2014.0438.

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Recent decades have witnessed steady improvements in our ability to harness the information-carrying capability of optical fibres. Will this process continue, or will progress eventually stall? Information theory predicts that all channels have a limited capacity depending on the available transmission resources, and thus it is inevitable that the pace of improvements will slow. However, information theory also provides insights into how transmission resources should, in principle, best be exploited, and thus may serve as a guide for where to look for better ways to squeeze more out of a precious resource. This tutorial paper reviews the basic concepts of information theory and their application in fibre-optic communications.
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MACKAPLOW, MICHAEL B., and ERIC S. G. SHAQFEH. "A numerical study of the sedimentation of fibre suspensions." Journal of Fluid Mechanics 376 (December 10, 1998): 149–82. http://dx.doi.org/10.1017/s0022112098002663.

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The sedimentation of fibre suspensions at low Reynolds number is studied using two different, but complementary, numerical simulation methods: (1) Monte Carlo simulations, which consider interparticle hydrodynamic interactions at all orders within the slender-body theory approximation (Mackaplow & Shaqfeh 1996), and (ii) dynamic simulations, which consider point–particle interactions and are accurate for suspension concentrations of nl3=1, where n and l are the number density and characteristic half-length of the fibres, respectively. For homogeneous, isotropic suspensions, the Monte Carlo simulations show that the hindrance of the mean sedimentation speed is linear in particle concentration up to at least nl3=7. The speed is well predicted by a new dilute theory that includes the effect of two-body interactions. Our dynamic simulations of dilute suspensions, however, show that interfibre hydrodynamic interactions cause the spatial and orientational distributions to become inhomogeneous and anisotropic. Most of the fibres migrate into narrow streamers aligned in the direction of gravity. This drives a downward convective flow within the streamers which serves to increase the mean fibre sedimentation speed. A steady-state orientation distribution develops which strongly favours fibre alignment with gravity. Although the distribution reaches a steady state, individual fibres continue to rotate in a manner that can be qualitatively described as a flipping between the two orientations aligned with gravity. The simulation results are in good agreement with published experimental data.
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DeVries, Jonathan W. "On defining dietary fibre." Proceedings of the Nutrition Society 62, no. 1 (February 2003): 37–43. http://dx.doi.org/10.1079/pns2002234.

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Establishing a definition for dietary fibre has historically been a balance between nutrition knowledge and analytical method capabilities. While the most widely accepted physiologically-based definitions have generally been accurate in defining the dietary fibre in foods, scientists and regulators have tended, in practice, to rely on analytical procedures as the definitional basis in fact. As a result, incongruities between theory and practice have resulted in confusion regarding the components that make up dietary fibre. In November 1998 the president of the American Association of Cereal Chemists (AACC) appointed an expert scientific review committee and charged it with the task of reviewing and, if necessary, updating the definition of dietary fibre. The committee was further charged with assessing the state of analytical methodology and making recommendations relevant to the updated definition. After due deliberation, an updated definition of dietary fibre was delivered to the AACC Board of Directors for consideration and adoption (Anon, 2000; Jones 2000/7). The updated definition includes the same food components as the historical working definition used for approximately 30 years (a very important point, considering that the majority of the research of the past 30 years delineating the positive health effects of dietary fibre is based on that working definition). However, the updated definition more clearly delineates the make-up of dietary fibre and its physiological functionality. As a result, relatively few changes will be necessary in analytical methodology. Current methodologies, in particular AACC-approved method of analysis 32–05 (Grami, 2000), Association of Official Analytical Chemists' official method of analysis 985.29 (Horwitz, 2000a) or AACC 32–07 (Grami, 2000) Association of Official Analytical Chemists 991.43 (Horwitz, 2000a) will continue to be sufficient and used for most foods. A small number of additional methods will be necessary to quantify the dietary fibre levels in foods containing fibres such as fructans (polymers and oligomers of fructose, inulin), modified dextrins, and/or synthetic dietary fibre analogues.
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Obrador, Antoni. "Fibre and colorectal cancer: a controversial question." British Journal of Nutrition 96, S1 (August 2006): S46—S48. http://dx.doi.org/10.1079/bjn20061700.

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Since the 1970s it has been postulated that dietary fibre is a protective factor against colorectal cancer. Several epidemiological studies have been performed following different designs (correlation studies, case–control, cohort) and overall they have supported the hypothesis of a benefit of dietary fibre. However, a few intervention trials have not demonstrated the preventive role of dietary fibre on the occurrence of adenomatous colorectal polyps. Nevertheless, there are multiple animal experimental studies that support the role of fibre in the prevention of colorectal cancer. In the present review, the most important contributions to this controversial question are revised. Finally, it is recommended to continue encouraging an increase in the daily consumption of fibre, since it probably plays an important role in the prevention of colorectal cancer, together with other beneficial effects.
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Björkman, Ulf. "The Nonlinear History of Fibre Flow Research. Part 1: Background and Beginning." Applied Rheology 18, no. 2 (April 1, 2008): 23974–1. http://dx.doi.org/10.1515/arh-2008-0008.

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Abstract Technical fibre flows are normally flocky, but have theoretically mainly been treated as individual fibre flows. The reason for this can only be understood in the context of historic development. In Part 1 of this historic investigation the roots of fibre flow research are traced to the beginning of the 19th century. The subsequent development is followed through its formative period in the first half of the 20th century up to about WW2. Part 2 will continue up to about 1960s when the present main tradition had been well established. In Part 2, an example of an alternative approach will also be given, and some proposals for future development presented.
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Che Muda, Zakaria, Payam Shafigh, Norhayati Binti Mahyuddin, Samad M. E. Sepasgozar, Salmia Beddu, and As’ad Zakaria. "Energy Performance of a High-Rise Residential Building Using Fibre-Reinforced Structural Lightweight Aggregate Concrete." Applied Sciences 10, no. 13 (June 29, 2020): 4489. http://dx.doi.org/10.3390/app10134489.

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The increasing need for eco-friendly green building and creative passive design technology in response to climatic change and global warming issues will continue. However, the need to preserve and sustain the natural environment is also crucial. A building envelope plays a pivotal role in areas where the greatest heat and energy loss often occur. Investment for the passive design aspect of building envelopes is essential to address CO 2 emission. This research aims to explore the suitability of using integral-monolithic structural insulation fibre-reinforced lightweight aggregate concrete (LWAC) without additional insulation as a building envelope material in a high-rise residential building in the different climatic zones of the world. Polypropylene and steel fibres in different dosages were used in a structural grade expanded clay lightweight aggregate concrete. Physical and thermal properties of fibre reinforced structural LWAC, normal weight concrete (NWC) and bricks were measured in the lab. The Autodesk@Revit-GBS simulation program was implemented to simulate the energy consumption of a 29-storey residential building with shear wall structural system using the proposed fibre-reinforced LWAC materials. Results showed that energy savings between 3.2% and 14.8% were incurred in buildings using the fibre-reinforced LWAC across various climatic regions as compared with traditional NWC and sand-cement brick and clay brick walls. In conclusion, fibre-reinforced LWAC in hot-humid tropical and temperate Mediterranean climates meet the certified Green Building Index (GBI) requirements of less than 150 kW∙h∙m−2. However, in extreme climatic conditions of sub-arctic and hot semi-arid desert climates, a thicker wall or additional insulation is required to meet the certified green building requirements. Hence, the energy-saving measure is influenced largely by the use of fibre-reinforced LWAC as a building envelope material rather than because of building orientation.
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Bisby, Luke, and Tim Stratford. "Design for fire of concrete elements strengthened or reinforced with fibre-reinforced polymer: state of the art and opportunities from performance-based approaches." Canadian Journal of Civil Engineering 40, no. 11 (November 2013): 1034–43. http://dx.doi.org/10.1139/cjce-2012-0506.

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Recent years have seen widespread success applying fibre-reinforced polymer (FRP) materials for internal reinforcement and externally bonded strengthening of concrete structures. However, considerable reductions in mechanical and bond properties of FRP materials at elevated temperatures continue to hinder their application in buildings, where structural fire-resistance ratings are typically required. To meet currently imposed fire safety requirements, FRP materials often require supplemental fire protection insulation or thick concrete cover to maintain their temperature below an assumed (though not currently well-defined) “critical” value during an assumed standard fire exposure. Such requirements are based on a definition of structural fire resistance that is rooted in a prescriptive framework and that fails to take advantage of the state of the art in performance-based structural design for fire safety. This paper is intended to present a summary of the state of the art in this area and also to demonstrate clear opportunities for internal FRP reinforcement and external FRP strengthening of concrete elements that may arise from taking a performance-based fire safety design approach.
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Dissertations / Theses on the topic "Fibre continue"

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Margueritat-Regenet, Caroline. "Elaboration et caractérisation de fils composites C/Al : infiltration spontanée et continue par activation chimique du mouillage." Phd thesis, École Nationale Supérieure des Mines de Paris, 2002. http://tel.archives-ouvertes.fr/tel-00005642.

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L'objectif de cette thèse est de développer un procédé peu coûteux d'élaboration en continu, sous air et à pression atmosphérique, de fils composites à fibres longues de carbone (50% en volume) incorporées dans une matrice daluminium. Cela passe nécessairement par la maîtrise de deux problèmes inhérents au couple C/Al : le non mouillage des fibres par laluminium liquide en dessous de 900°C et la formation de carbures fragiles à l'interface carbone/aluminium liquide. L'activation chimique du mouillage est assurée par un sel fluoré à base de potassium et de zirconium. Il s'agit de dissoudre la couche d'alumine et d'engendrer localement une réaction exothermique suffisante à l'interface C/Al pour promouvoir le mouillage.
La mèche de fibre (Torayca T700S-12K) étant commercialisée avec 1% en masse densimage, une première étape a consisté en l'élimination de cette couche d'époxy par dégradation thermique sous air. D'une part, il a été construit un diagramme pour le choix des paramètres de désensimage (température du four, vitesse de défilement) minimisant la perte des propriétés mécaniques des fibres. D'autre part, la cinétique du phénomène de désensimage a été établie afin de prévoir le désensimage " dynamique " sur le pilote en connaissant le profil thermique de la mèche pour les conditions opératoires données.
La mèche est ensuite trempée dans une solution aqueuse saturée d'un sel fluoré à 95°C puis séchée sous air, dans la seconde étape, dite de traitement au flux pour laquelle les paramètres opératoires sont la vitesse de défilement et la composition du flux. Il s'est agi ici d'étudier, plus particulièrement, le vieillissement de la solution aqueuse et la qualité du dépôt de cristaux sur la mèche (morphologie, répartition et quantité). D'une manière générale, le coeur de la mèche est beaucoup moins bien traité que sa surface. Laction de plusieurs composés fluorés sur le mouillage des fibres par l'aluminium a été regardé. Un schéma réactionnel s'appuyant essentiellement sur une étude ATD a mis en évidence le rôle favorable de l'oxydation par l'air de l'aluminium natif pour l'imprégnation du coeur du composite. Comparée à la toute première réaction flux/alumine, cest principalement la réaction flux/aluminium liquide qui engendre lélévation suffisante de température permettant dinitier l'infiltration.
Enfin, la mèche passe par un bain d'aluminium liquide (99,7% en masse) à 710°C sous air : c'est l'étape d'infiltration dont les paramètres sont la température du bain et la vitesse de défilement. Dans cette dernière étape, le but était de définir la microstructure et les propriétés du fil composite élaboré selon les conditions optimales. Des observations fines au MET indiquent la présence de précipités Al3Zr et Al4C3 à linterface fibre/matrice. Cette adhésion chimique contribue à limiter la tenue mécanique du fil tout comme la distribution inhomogène des fibres, la présence de porosités naturelles et de cryolithe solidifiée. Le meilleur fil composite a été obtenu pour une vitesse lente (1m/min) et une température moyenne du bain (710°C)°. Sa résistance à la traction ne dépasse pas 520Mpa pour une fraction volumique de fibres de 40%, ce qui suggère de minimiser les dégradations diverses subies par le renfort dans les trois étapes et les défauts liés à l'infiltration réactive.
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Dubrasquet, Romain. "Etude et développement de sources laser à fibre dopées Ytterbium émettant à des longueurs d'ondes exotiques pour des applications industrielles et médicales." Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0415/document.

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La technologie des lasers à gaz Argon et Hélium Cadmium ionisés est obsolète et leurs production est abandonnée. Etant donné le vaste champ des applications basées sur les longueurs d’onde (488 nm, 325 nm) générées par cette technologie, il apparait essentiel d’imaginer une solution alternative. Les travaux exposés dans ce manuscrit traitent de l’étude des solutions apportées par la conversion en fréquence des lasers à fibre dopées ytterbium fonctionnant sur leur transition 3 niveaux à 976 nm. Les conditions d’obtention d’un effet laser sur cette transition particulière où section efficace d’émission et d’absorption sont confondues sont tout d’abord explicitées. Ensuite, nous présentons le développement d’une source laser continue monofréquence à 976 nm permettant de générer plus de 35W en limite de diffraction (M²<1.1). Le doublement en fréquence de cette source fondamentale à 976 nm dans des cristaux à alternance de polarisation (PPsLT) conduit à générer plus de 4W à 488 nm (bleu) en simple passage avec un niveau de bruit d’intensité extrêmement bas (0,05%rms sur la gamme 100Hz – 10MHz).Puis, nous relatons la démonstration de plus de 760 mW à la longueur d’onde ultraviolette de 325,3 nm à partir d’une laser à fibre impulsionnel nanoseconde (5ns ; 100 kHz) triplé en fréquence dans deux étages de cristaux non linéaires (LBO 20mm type I puis type II) délivrant près de 7,6 W soit une énergie de 73μJ et une puissance crête de 14,3kW à la longueur d’onde fondamentale de 976 nm et une puissance de 2,8 W à 488 nm à la seconde harmonique. L’efficacité de conversion de l’IR vers l’UV est donc de 10%. Enfin, nous rapportons la génération de plus de 2 W à 325,3 nm en régime picoseconde (15ps ; 20MHz) par triplement en fréquence (cascade de deux LBO) d’un laser à fibre générant une puissance moyenne de 16 W à 976 nm soit une énergie de 0,8 μJ et une puissance crête de 52kW. Ce qui représente une efficacité de conversion de 12%
Gas laser technology (Ar ion and HeCd lasers) is now largely obsolete, with new production rapidly disappearing. Given the vast application domain based around these wavelengths (488nm, 325 nm…), it seems extremely important to develop alternative solutions. The work presented in this thesis covers the study of relevant solutions via frequency conversion of Yb fiber lasers emitting on the three level transition at 976 nm. The necessary conditions for laser operation in this zone where absorption and emission peaks are superimposed are presented. Next, we present the development of a single mode, single frequency source at 976 nm giving a record 35W output power with diffraction limited performance (M2<1.1). Frequency doubling of the fundamental radiation in a PPSLT crystal allowed the generation of more than 4W of output at 488 nm in a single pass configuration with extremely low noise (0.05%RMS from 100Hz to 10MHz).Subsequently, 760 mW of output power was generated at 325 nm via frequency tripling of a multi-watt nanosecond source at 976 nm (5ns, 100 kHz). Type I and type II interactions in LBO were used in this case allowing us to demonstrate an overall conversion efficiency of 10% from IR to UV.Finally, we report on the generation of 2W of output power at 325 nm by frequency tripling of a 15 ps laser generating 16W at 976 nm, representing a pulse energy of 0.8μJ and a peak power of 52 kW (conversion efficiency of 12%)
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Coulson, MiKe. "Conductivité, diffusivité, émissivité thermiques de composites poly (EtherKetoneKetone) - charges carbonées : fibres continues et particules." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30215.

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L'objectif de ces recherches est l'amélioration du procédé de placement de fibre par dépose laser, appliqué à des composites Poly(EtherKetoneKetone) / fibre carbone continue. L'optimisation des paramètres de dépose implique l'étude de la stabilité de la matrice, ainsi que l'analyse du comportement thermique des composites. La conductivité et diffusivité thermiques, ainsi que l'émissivité sont les paramètres clés pour comprendre le comportement des transferts volumiques et surfacique dans ces matériaux. Des composites PEKK/particules de carbone ont été élaborés afin d'étudier l'effet de la morphologie du carbone sur les paramètres thermiques. L'émissivité des composites PEKK / fibres continues a été mesurée en comparant les radiations émises par le matériau et celle émises par un corps noir à la même température. La conductivité et la diffusivité thermiques, qui sont des paramètres intrinsèques au composite, augmentent avec le taux de charge et la température. Ces deux paramètres ont été étudiés en fonction de la Température, dans le cas de composite PEKK / fibre carbone continue et PEKK / particules de carbone pour plusieurs taux de charge
: The aim of this research is the improvement of the laser depositing fiber placement process, applied to Poly (EtherKetoneKetone) / continuous carbon fiber composites. The optimization of deposit parameters implies the investigation of the stability of the matrix and of the thermal behavior of composites. Thermal conductivity, diffusivity, and optical emissivity, are the key parameters for understanding the behavior of volume and surface conduction of composites. PEKK / carbon particle composites have been processed to study the effect of carbon morphology on thermal parameters. The emissivity of the PEKK / continuous fiber composites was measured by comparing the radiation emitted by the material with the one emitted by a black body at the same temperature. Thermal conductivity and diffusivity, which are intrinsic parameters of the composite, increase with the rate of charge and the temperature. These two parameters have been studied as a function of temperature, in the case of PEEK / continuous fibers composites and PEKK / carbon particles composites for various charge rates
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Villard, Pascal. "Etude du renforcement des sables par des fils continus : modelisation et applications." Nantes, 1988. http://www.theses.fr/1988NANT2017.

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Modele numerique du materiau texsol, en associant un modele elastoplastique pour le sol (vermeer) et une loi non lineaire integrant les caracteristiques des fils (dosage, orientation, distribution). Developpement de deux logiciels par elements finis: problemes axisymetriques (comparaison a essais triaxiaux) et en deformation plane (murs)
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Vienney, Martine. "Etude d'un procede de retention de biomasse pour le fonctionnement de reacteurs biologiques a l'alimentation continue : son application au traitement anaerobie des effluents industriels." Poitiers, 1988. http://www.theses.fr/1988POIT2339.

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Limaiem, Sarra. "Étude et développement d’une interface fibre-matrice spécifique dans les composites à matrice thermoplastique renforcés en fibres de verre continues." Thesis, Mulhouse, 2016. http://www.theses.fr/2016MULH8553.

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Au cours de cette étude, il a été question de développer une méthodologie d’élaboration et d’évaluation de la qualité de l’interface fibre-matrice au sein d’un composite à matrice polyamide 12 renforcé par du verre. Un modèle macroscopique a été élaboré dans un premier temps sous forme d’un assemblage lame de verre/film polyamide 12, et plusieurs promoteurs d’adhésion, principalement des organosilanes, de fonctionnalités différentes et compatibles avec la matrice polyamide ont été testés. La qualité du greffage a pu être caractérisée grâce à des techniques d’analyses physico-chimiques adaptées (AFM, PM-IRRAS, mouillabilité,…), et la performance adhésive des assemblages a pu être évaluée par des tests mécaniques spécifiques (pelage, clivage). Dans une seconde étape, le protocole de dépôt décrit à l’échelle macroscopique a été adapté à l’échelle des fibres de verre, plus particulièrement à l’échelle mésoscopique des fibres optiques. Des essais mécaniques spécifiques à l’échelle microscopique (fragmentation) ont été réalisés afin d’évaluer la performance adhésive de l’interface dans les assemblages concernés. Une étude focalisée sur la compréhension des mécanismes interfaciaux a également été réalisée afin de clarifier la nature des interactions établies à l’interface fibre-matrice. Grâce aux différentes techniques de caractérisation physico-chimiques il a été possible de mettre en évidence l’influence de différents paramètres expérimentaux, tels que la durée du greffage, la densité de greffage et la chimie des surfaces traitées, sur la cristallisation de la matrice à l’interface. La dernière partie de ce travail de thèse concerne le passage à l’échelle du semi-produit sous forme de rubans. Des analyses des propriétés de l’interface ainsi que des caractéristiques mécaniques ont été réalisées
During this study, the aim was to develop a methodology to elaborate and evaluate the quality of the fiber-matrix interface in a glass fiber reinforced polyamide 12 composite.At first, a macroscopic model was developed using a glass slide/polyamide 12 film assembly. Several organosilane adhesion promoters with different features and compatible with the polyamide matrix were tested. The grafting quality was characterized through appropriate physico-chemical analytical techniques (AFM, PM-IRRAS, Wetting…), and the adhesive performance of the assemblies was evaluated by specific mechanical tests (Peel test, Wedge test). In a second step, the deposition procedure described in macroscopic scale has been adapted to the glass fibers’ scale, more particularly to optical fibers. Specific mechanical tests were performed (fragmentation test) to assess the adhesive performance at the interface of the concerned assemblies.A study focused on the understanding of the interfacial mechanisms was also conducted to clarify the nature of the interactions established at the fiber-matrix interface. Thanks to the different physico-chemical characterization techniques, it has been possible to demonstrate the influence of various experimental parameters such as the surface treatment time, the grafting density and the chemistry on the treated surfaces on the crystallization of the matrix at the interface. The last part of this work concerns the transition to the semi-scale form of ribbons. The analysis of the interface’s properties and the mechanical characteristics has been investigated
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Larivière, Damien. "Influence de l'interface fibre/matrice sur l'endommagement et le comportement mécanique de composites thermoplastiques à fibres de verre continues." Lille 1, 2001. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2001/50376-2001-227.pdf.

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Le développement de nouveaux composites co-mêlés à fibres continues et matrice thermoplastiques de grande diffusion verre/PP a apporté a priori une solution technologique, économiquement satisfaisante, aux problèmes de conservation, de mise en œuvre, de fragilité voire de recyclage des composites thermodurcis. Cependant, la jeunesse de ces nouveaux matériaux constitue paradoxalement un frein à une utilisation industrielle plus large, du fait d'une maîtrise imparfaite de leur comportement, notamment pour ce qui est du rôle de l'interface fibre/matrice. Le programme de recherche développé dans le cadre de ce travail a permis de préciser la sensibilité de diverses méthodes expérimentales (traction transversale, mécanique de la rupture, émission acoustique, fractographie) au paramètre 'interface', de mettre en évidence, d'une part, certaines grandeurs caractéristiques susceptibles d'être influencées de manière conséquente par une modification de la qualité interfaciale dans des proportions dépassant parfois 100% et, d'autre part, les effets séparés et couplés d'ensimages des renforts et de couplage de la matrice en termes de niveau d'adhésion fibre/matrice. Il est apparu en particulier qu'il était économiquement plus intéressant de porter les efforts de développement sur les ensimages des renforts plutôt que sur le couplage des matrices. A été mise en évidence, en outre, une instabilité du réseau physico-chimique constituant l'interphase entraînant la variation du comportement mécanique macroscopique du matériau au cours du temps dans des proportions significatives. Enfin, l'application de la mécanique de la rupture en mode I a permis de séparer les mécanismes d'amorçage et de propagation de fissures sur lesquels la qualité de l'interface/interphase a une influence spécifique.
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Lapointe, Marc-André. "Lasers à fibre de puissance opérés en régime continu." Thesis, Université Laval, 2010. http://www.theses.ulaval.ca/2010/27088/27088.pdf.

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Le présent projet de recherche porte sur les lasers à fibre de haute puissance opérés en régime continu. L’objectif premier est la conception et la réalisation d’un laser de 400 W de puissance de sortie utilisant une fibre dopée à l’ytterbium. La grande variété de lasers fabriqués au cours de ces travaux a permis l’étude des effets thermiques, des limitations en puissance et du comportement de la raie spectrale d’émission. L’étude comprend des simulations numériques caractérisant le comportement des lasers à fibre opérés en régime continu. Différentes configurations de lasers ont été expérimentées à une puissance de signal de 100 W. Les échanges de chaleur dans les fibres à double gaines ont été analysés pour contourner les difficultés engendrées par la grande puissance de ces lasers. Le concept de résistance de contact est amené pour expliquer l’élévation de température des fibres actives. Les travaux ont abouti à la réalisation de lasers monomodes de plus de 350 W de puissance de sortie, et cela, limités uniquement par la disponibilité des pompes. Parce que la photodégradation est la principale difficulté des lasers à fibre de puissance, plusieurs compromis, notamment sur le choix technologique des composants, ont été nécessaires pour atteindre les objectifs de puissance et de qualité de faisceau. Un outil pour prédire l’élargissement spectral des lasers à fibre de haute puissance a été développé. Il est montré que le mélange à quatre ondes élargit la raie d’émission de ces lasers. L’élargissement du spectre de sortie, selon une fonction de la puissance, a été vérifié expérimentalement dans diverses configurations d’oscillateur.
This research project focuses on high power fiber lasers operated in the continuous regime. The main objective is the implementation of a 400-W fiber laser using ytterbium- doped double clad fiber. The wide variety of high power fiber lasers assembled during this work has enabled the study of the thermal effects, the power limitations and the behavior of the output spectrum. The study includes simulations that characterize the behavior of fiber lasers operated in the continuous regime. Different laser configurations were tested at a signal power of 100 W. The heat transfer in double clad fibers was analyzed to circumvent the difficulties caused by the important amount of heat generated by these lasers. The concept of contact resistance is brought in to explain the temperature rise of active fibers. This was necessary for the realization of single-mode fiber lasers with over 350W of output power. The output power was only limited by the availability of pumps. Several compromises were necessary to achieve the high output power and the diffraction-limited beam quality. Thus, the photodarkening of the ytterbium doped fiber is still an issue for this kind of lasers. A tool to predict the spectral broadening of high power fiber lasers has been developed. It is shown that four-wave mixing broadens the outpu t spectrum of these lasers as a function of output power. The broadening of the output spectrum has been experimentally verified by the implementation of various lasers with different configurations. A theoretical model is presented, which shows a good agreement with experimental data.
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Bale, Jefri Semuel. "The damage observation of composite using non destructive testing (NDT) method." Thesis, Paris 10, 2014. http://www.theses.fr/2015PA100067/document.

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L'objectif de ce travail de thèse est d'étudier le comportement de l'endommagement des matériaux composites sous chargement statique et fatigue par contrôle non destructif (C.N.D) thermographie et soutenu par émission acoustique et la tomographie (CT scan). Pour cela, ce unidirectionnels composite à fibres de verre (GFRP) et discontinue composite à fibres de carbone (DCFC) ont été utilisés comme les éprouvettes qui ont fourni par PSA peugeot citröen, France. Une série d'essais mécaniques a été réalisée pour déterminer le comportement de l'endommagement sous chargement statique et fatigue. Pendant tout des essais mécanique, la thermographie a été utilisé pour l'observation en temps réel pour suivre l'évolution des températures sur la surface de l'éprouvette et supporté par émission acoustique dans certaines conditions. Cette étude a utilisé une forme rectangulaire et se compose d'éprouvettes trouées et non trouées au centre de l'éprouvette. La vitesse de déplacement constante est appliquée pour observer l'effet sur le comportement de l'endommagement sous chargement de traction statique. Sous les essais de fatigue, le paramètre constant de la fréquence et de l'amplitude de stress a été étudiée pour chaque niveau de charge pour avoir les propriétés de fatigue et l'évolution de l'endommagement de l'éprouvette. La tomographie a été utilisée pour confirmer l'apparition de l'endommagement et l'etat du matériau après l'essai de fatigue. L'analyse des résultats de l'expérimentation et de l'observation NDT montré le bon accord entre les résultats mechnical et NDT thermographie avec prise en charge par l'observation de l'émission acoustique en détecter l'apparition et la propagation de l'endommagement de GFRP PRV et DCFC sous chargement de statique en traction. Les essais en fatigue montrent que la dissipation thermique est liée à l'évolution de l'endommagement et également thermographie et peut être utilisé avec succès pour déterminer la limite d'endurance (HCFS) et la courbe de Wöhler du matériau composite. Les résultats par CT scan ont mesurée avec succès les endommagements et l'état du matériau après essai de fatigue du matériau composite
The aim of this study is to investigate the damage behaviour of composite material in static and fatigue condition with non destructive testing (NDT) thermography method and supported by acoustic emission and also computed tomography (CT) scan. Thermography and acoustic emission are used in real-time monitoring techniques during the test. On the other hand, NDT observation of tomography is used for a post-failure analysis. In order to achive this, continuous glass fiber composite (GFRP) and discontinuous carbon fiber composite (DCFC) have been used as the test specimens which supplied by PSA Company, France. A series of mechanical testing was carried out to determine the damage behaviour under static and fatigue loading. During all the mechanical testing, thermography was used in real-time observation to follow the temperature change on specimen surface and supported by acoustic emission in certain condition. This study used rectangular shape and consist of specimen with and without circular notches (hole) at the center. The constant displacement rate is applied to observe the effect on damage behaviour under tensile static loading. Under fatigue testing, the constant parameter of frequency and amplitude of stress was explored for each load level to have the fatigue properties and damage evolution of specimen. The tomography was used to confirm the appearance of damage and material condition after fatigue testing. The analysis from the experiment results and NDT observation shown the good agreement between mechnical results and NDT thermography with supported by acoustic emission observation in detect the appearance and propagation of damage for GFRP and DCFC under static loading. Fatigue testing shows that thermal dissipation is related to the damage evolution and also thermography and can be successfully used to determine high cycle fatigue strength (HCFS) and S-N curve of fiber composite material. From post failure analysis, CT scan analysis successfully measured and evaluated damage and material condition after fatigue test for fiber composite material. v
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Veyrat, Alain. "Procédé électrochimique de traitement en continu de fibres de carbone par greffage d'amines ou de groupements aryls substitués." Vandoeuvre-les-Nancy, INPL, 1996. http://www.theses.fr/1996INPL055N.

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L’objectif de cette étude est la conception et la réalisation d'un dispositif pilote de traitement de surface de fibres de carbone. Le traitement consiste en une oxydation électrochimique dans un milieu acétonitrile qui aboutit au greffage de fonctions aminées à la surface des fibres. Cet apport d'azote améliore fortement l'adhésion entre les fibres et les résines époxydes dans les matériaux composites. Le phénomène, mis en évidence par voltamétrie, est caractérisé par des analyses de surface ESCA. La cinétique du greffage de l'éthylènediamine a été étudiée sur des électrodes de fibres fixes en faisant varier leur longueur et le potentiel d'électrode appliqué. Les mesures d'intensité ont montré le rôle prépondérant de l'amine dans l'oxydation ainsi que la décroissance de l'activité le long de l'électrode. Les performances du greffage dans un dispositif ou la mèche de fibres circule dans divers bains ont été évaluées suivant trois modes de fonctionnement de la cellule électrochimique: contrôle du potentiel d'électrode, de la tension de cellule ou de la distribution de courant dans la cellule. La quantité d'azote fixée sur les fibres dépend principalement de la vitesse de défilement du fil dans la cellule. Une quantité importante de fibres traitées à la triéthylènetétramine a été produite, afin de préciser l'apport du traitement aminant au niveau des propriétés mécaniques des composites. Les résultats sont comparés avec ceux issus d'un autre procédé de traitement électrochimique, conduisant également à un apport d'azote en surface des fibres après la réduction de sels de diazonium en milieu acide
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Books on the topic "Fibre continue"

1

Johnny Werd: The fire continues. Urbana, Ill: Spineless Books, 2003.

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Istarú, Ana. Poesía escogida: Contiene La Estación de Fiebre. San José, Costa Rica: Editorial Costa Rica, 2002.

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German, Janusz. Intralaminar damage in fiber-reinforced polymeric matrix laminates. Cracow: Cracow University of Technology, 2004.

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Bosanek, Jim. Omaha fire department: 150 years of continued dedication and service provided to the citizens of the City of Omaha, Nebraska. Evansville, Ind: M.T. Publishing, 2010.

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Motto, Francesco. Cento anni fa la catastrofe di San Francisco: Il "faticoso, enorme, continuo" soccorso dei salesiani alla comunità italiana. [Roma: Editrice LAS, 2006.

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Defoe, Daniel. A journal of the plague year: Written by a citizen who continued all the while in London. New York: Barnes & Noble, 2004.

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Compagnie d'assurance de Montréal contre les accidents du feu. Articles d'association de la Compagnie d'assurance de Montréal contre les accidents du feu: Tels qu'amendés à une assemblée générale des actionnaires de la dite compagnie, tenue à Montréal, lundi le 21 décembre dernier ... et continuée par divers ajournements à mercredi le vingt janvier, mil huit cent dix-neuf. [Montréal]: De l'imprimerie de C.B. Pasteur, 1985.

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Defoe, Daniel. A journal of the plague year: Being observations of memorialsof the most remarkable occurrences ... in London during the last great visitation in 1665. Written by a citizen who continued all the while in London. London: Dent, 1995.

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Defoe, Daniel. A journal of the plague year: Being observations or memorials of the most remarkable occurrences, as well public as private, which happened in London during the last great visitation in 1665 : written by a citizen who continued all the while in London : never made public before. Thorndike, Me: G.K. Hall, 2000.

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United States. Congress. House. Committee on Agriculture. Expressing the sense of Congress that it is the goal of the United States that, not later than January 1, 2025, the agricultural, forestry, and working land of the United States should provide from renewable resources not less than 25 percent of the total energy consumed in the United States and continue to produce safe, abundant, and affordable food, feed, and fiber: Report (to accompany H. Con. Res. 25). [Washington, D.C: U.S. G.P.O., 2007.

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Book chapters on the topic "Fibre continue"

1

Mouritz, Adrian P. "Mechanics of 3D Fibre Reinforced Polymer Composites." In Encyclopedia of Continuum Mechanics, 1533–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-55771-6_93.

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Mouritz, A. P. "Mechanics of 3D Fibre Reinforced Polymer Composites." In Encyclopedia of Continuum Mechanics, 1–17. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-53605-6_93-1.

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Islam, Mohammed N. "Infrared Super-continuum Light Sources and Their Applications." In Raman Fiber Lasers, 117–203. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-65277-1_4.

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Demirkoparan, Hasan, Thomas J. Pence, and Alan Wineman. "Fiber Remodeling During Torsion of a Fiber Reinforced Hyperelastic Cylinder—Unloading Behavior." In Methods and Tastes in Modern Continuum Mechanics, 163–85. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1884-5_12.

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Mouhmid, B., A. Imad, and N. Benseddiq. "A Fracture Analysis of Short Glass Fibre Reinforced SGFR-PA66." In Particle and Continuum Aspects of Mesomechanics, 461–72. London, UK: ISTE, 2010. http://dx.doi.org/10.1002/9780470610794.ch47.

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Vincent, H., C. Vincent, J. L. Ponthenier, H. Mourichoux, and J. Bouix. "Elaboration en Continu d’un Depot Mince de Carbure Refractaire en Surface des Fibres de Carbone: Caracterisation de la Fibre C/SiC." In Developments in the Science and Technology of Composite Materials, 257–64. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1123-9_35.

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Gotsis, Pascalis K., Christos C. Chamis, Kostantinos David, De Xie, and Frank Abdi. "Progressive Fracture of Laminated Fiber-Reinforced Composite Stiffened Plate under Thermo-mechanical Loads." In Particle and Continuum Aspects of Mesomechanics, 509–18. London, UK: ISTE, 2010. http://dx.doi.org/10.1002/9780470610794.ch52.

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Horgan, Cornelius O., and Jeremiah G. Murphy. "On the Normal Stresses in Simple Shearing of Fiber-Reinforced Nonlinearly Elastic Materials." In Methods and Tastes in Modern Continuum Mechanics, 343–55. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1884-5_22.

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Averill, R. C., and G. P. Carman. "Analytical Modeling of Micromechanical Stress Variations in Continuos Fiber-Reinforced Composites." In Local Mechanics Concepts for Composite Material Systems, 27–61. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-84792-9_2.

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Katsiropoulos, Ch V., Patrice Lefebure, and Sp G. Pantelakis. "Effect of PPS Matrix Evolution during Processing of Carbon Fiber Reinforced PPS on the Mechanical Behaviour of the Composite Material." In Particle and Continuum Aspects of Mesomechanics, 553–62. London, UK: ISTE, 2010. http://dx.doi.org/10.1002/9780470610794.ch57.

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Conference papers on the topic "Fibre continue"

1

Cole, Matt, Scott Martin, and Scott Adams. "Use of Remote Equipment in Reactor Decommissioning." In ASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2009. http://dx.doi.org/10.1115/icem2009-16326.

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Nuclear reactor decommissioning continues to remain at the forefront of the energy and defence industries as many reactors built from the 1940s to the 1970s are reaching the end of their life cycles. As demand for decommissioning increases, the focus on worker’s health and safety has become paramount. This focus on worker safety, coupled with the unique challenges faced in reactor decommissioning, continues to promote the use of remote equipment in the decommissioning process. New technologies available in the market today have also created new opportunities for the implementation and application of remote equipment for reactor decommissioning. These technologies include: carbon fibre, high pressure liquid cutting, and advanced control packages. Also, the methods for remote deployment of existing decommissioning technologies such as flame cutting, shearing, and heavy equipment continue to evolve. This paper will focus on the use of this technology at the following facilities: the decommissioning of the Rancho Seco reactor in California, the Brookhaven graphite research reactor in New York, the Windscale Pile 1 Reactor in the United Kingdom, and the Fort St. Vrain HTG Reactor in Colorado. These have all used remote equipment and emerging technologies to solve complex problems in nuclear reactor decommissioning. The purpose is this paper is to outline some of the challenges associated with reactor decommissioning, describe new technologies and deployment techniques being used in the decommissioning field, and to provide an overview of projects using these new technologies.
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Sacks, Michael S. "A Novel Approach to Account for Non-Affine Fiber Kinematics in Structural Continuum Models for Heart Valves Leaflets." In ASME 2010 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2010. http://dx.doi.org/10.1115/sbc2010-19710.

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In the ongoing development of continuum models for soft tissues and related biological materials, structural approaches continue to have much appeal, and have the focus of our laboratory’s work (1). Structural constitutive models integrate information on tissue composition and structure, avoiding ambiguities in material characterization. However, critical structural information (such as fiber orientation) must be modeled using assumed statistical distributions, with the distribution parameters estimated from fits to the mechanical test data. Thus, full realization of structural approaches continues to be limited without direct quantitative structural information for direct implementation or to validate model predictions. While we have addressed these issues (2), non-affine fiber kinematics have been known to occur in heart valve leaflet tissues, especially under more extreme deformations (3, 4). However, current structural model theories continue to rely on the assumption of affine fiber kinematics. In present work we present a theoretical framework that accounts for non-affine deformations that still allows for the basic framework of the current structural models to be utilized.
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Farahmand, Farid, Isabella Cerutti, M. Masud Hasan, and Jason P. Jue. "Energy-efficiency of Drop-and-Continue Traffic Grooming." In Optical Fiber Communication Conference. Washington, D.C.: OSA, 2011. http://dx.doi.org/10.1364/ofc.2011.otur6.

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Najafi, Bijan, Robert P. Kassawara, Francisco Joglar-Biloch, and Yehia Khalil. "History of Fire Events in the U.S. Commercial Nuclear Industry." In 10th International Conference on Nuclear Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/icone10-22587.

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Over the past decade, interest in performance-based fire protection has increased within the nuclear industry. In support of this growing interest, in 1997 the Electric Power Research Institute (EPRI) developed a long-range plan to develop/improve data and tools needed to support Risk-Informed/Performance-Based fire protection. This plan calls for continued improvement in collection and use of information obtained from fire events at nuclear plants. The data collection process has the objectives of improving the insights gained from such data and reducing the uncertainty in fire risk and fire modeling methods in order to make them a more reliable basis for performance based fire protection programs. In keeping with these objectives, EPRI continues to collect, review and analyze fire events in support of the nuclear industry. EPRI collects these records in cooperation with the Nuclear Electric Insurance Limited (NEIL), by compiling public fire event reports and by direct solicitation of U.S. nuclear facilities. EPRI fire data collection project is based on the principle that the understanding of history is one of the cornerstones of improving fire protection technology and practice. Therefore, the goal has been to develop and maintain a comprehensive database of fire events with flexibility to support various aspects of fire protection engineering. With more than 1850 fire records over a period of three decades and 2400 reactor years, this is the most comprehensive database of nuclear power industry fire events in existence today. In general, the frequency of fires in the U.S. commercial nuclear industry remains constant. In few cases, e.g., transient fires and fires in BWR offgas/recombiner systems, where either increasing or decreasing trends are observed, these trends tend to slow after 1980. The key issues in improving quality of the data remain to be consistency of the recording and reporting of fire events and difficulties in collection of records. EPRI has made significant progress towards improving the quality of the fire events data through use of multiple collection methods as well as its review and verification. To date EPRI has used this data to develop a generic fire ignition frequency model for U.S. nuclear power industry (Ref. 1, 4 and 5) as well as to support other models in support of EPRI Fire Risk Methods such as a cable fire manual suppression model. EPRI will continue its effort to collect and analyze operating data to support risk informed/performance based fire safety engineering, including collection and analysis of impairment data for fire protection systems and features. This paper provides details on the collection and application of fire events to risk informed/performance based fire protection. The paper also provides valuable insights into improving both collection and use of fire events data.
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Noble, Lilia, Hugh Rees, Pradyumn Thiruvenkatanathan, and Tommy Langnes. "Well Integrity Diagnostics Using Acoustic Event Classification on Distributed Acoustic Sensing Data." In Offshore Technology Conference. OTC, 2021. http://dx.doi.org/10.4043/30930-ms.

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Abstract Injection wells experience extremes of pressure and temperature as well as expansion and contraction during their normal operating cycles. This can cause numerous well integrity issues related to corrosion, leakage, degradation of barrier elements, operational practices that all put the health of the well at risk and require appropriate management. This paper will describe a case of a North Sea injection well that over time had developed sustained casing pressure (SCP) in the B-annulus. As a critical well in the development it was necessary to understand the origin and nature of the SCP as this would set further operational plans for the well helping to decide whether the well could continue to be operated safely, would require an intervention, or potentially will be abandoned. A leak investigation was needed to try to determine the source of the pressure, the type of fluid causing the pressure, the fluid path, and whether there was an injection out-of-zone as a result. To address all of the set objectives Distributed Fibre Optic (DFO) system was selected as a technology of choice. DFO provides an advantage over traditional leak detection methods through the ability to simultaneously monitor entire length of the well recording both acoustic and temperature profiles. Distributed Acoustic Sensing (DAS) was used to record acoustic signature of the well helping to determine the leak origin and likely pathway, while Distributed Temperature Sensing (DTS) was used to record well outflow profile and advise on possibility of out-of-zone injection. Use of pattern recognition techniques allowed to extract leak signature from background noise and other acoustic signals helping to pinpoint leak location. As a result of the application of DFO technology coupled with appropriate processing techniques way ahead for the well was identified providing an operator with a confident answer and saving on further intervention costs.
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Westbrook, P. S., J. W. Nicholson, and K. S. Feder. "Grating Enhanced Continuum Generation." In 2008 Conference on Optical Fiber Communication - OFC 2008 Collocated National Fiber Optic Engineers. IEEE, 2008. http://dx.doi.org/10.1109/ofc.2008.4528678.

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7

Duck, B. C., B. Dean, J. L. Holdsworth, and P. C. Dastoor. "Mode structure in continuum generation." In 2006 Australian Conference on Optical Fibre Technology (ACOFT). IEEE, 2006. http://dx.doi.org/10.1109/acoft.2006.4519257.

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8

Dreps, Daniel. "How Server Designs Will Change as Interface Bandwidth Demands Continue to Increase." In Optical Fiber Communication Conference. Washington, D.C.: OSA, 2015. http://dx.doi.org/10.1364/ofc.2015.m3h.2.

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9

Hasan, M. Masud, Farid Farahmand, Jason P. Jue, and Zuqing Zhu. "Knapsack-based Drop-and-Continue Traffic Grooming for Power and Resource Efficiency." In Optical Fiber Communication Conference. Washington, D.C.: OSA, 2012. http://dx.doi.org/10.1364/ofc.2012.oth1a.6.

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10

Soubestre, J., C. Boutin, Theodore E. Simos, George Psihoyios, and Ch Tsitouras. "Generalized Continua for Fiber Reinforced Materials." In NUMERICAL ANALYSIS AND APPLIED MATHEMATICS: International Conference on Numerical Analysis and Applied Mathematics 2009: Volume 1 and Volume 2. AIP, 2009. http://dx.doi.org/10.1063/1.3241610.

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Reports on the topic "Fibre continue"

1

Freeman, Michael J. Mid-Infrared Fiber Laser Based on Super-Continuum. Fort Belvoir, VA: Defense Technical Information Center, January 2007. http://dx.doi.org/10.21236/ada469712.

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2

Wright, Jeffrey S. Field Artillery and the Combined Arms Team: A Case for the Continued Relevance of American Fire Support. Fort Belvoir, VA: Defense Technical Information Center, April 2015. http://dx.doi.org/10.21236/ad1001935.

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