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Dissertations / Theses on the topic 'Fiber placement'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

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1

Moutran, Serge Riad. "Feasible Workspace for Robotic Fiber Placement." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/32738.

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Online consolidation fiber placement is emerging as an automated manufacturing process for the fabrication of large composite material complex structures. While traditional composite manufacturing techniques limited the productsâ size, geometrical shapes and laminate patterns, robotic automation of the fiber placement process allows the manufacture of complex bodies with any desired surface pattern or towpregâ s direction. Therefore, a complete understanding of the robot kinematic capabilities should be made to accurately position the structureâ s substrate in the workcell and to compute t

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2

Lee, Munki. "Heat Transfer and Consolidation Modeling of Fiber Tow in Fiber Placement." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/11123.

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New heating techniques are required to better control heat transfer between heating tools and a composite towpreg in the automated fiber placement process. This dissertation suggests new heating techniques with liquid and rigid contact heat sources, and compares them with a widely used gas heat source for the fiber placement process. A thin towpreg composite model needs to be developed to describe the heat transfer. Subsequently, the response of the towpreg with each heat source was compared from manufacturing speed and energy efficiency viewpoints. The most promising heat source was develope

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3

Cameron, Alexander John. "A Bayesian approach to optimal sensor placement." Thesis, University of Oxford, 1989. http://ora.ox.ac.uk/objects/uuid:ad201132-d418-4ee4-a9d5-3d79bd4876a7.

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By "intelligently" locating a sensor with respect to its environment it is possible to minimize the number of sensing operations required to perform many tasks. This is particularly important for sensing media which provide only "sparse" data, such as tactile sensors and sonar. In this thesis, a system is described which uses the principles of statistical decision theory to determine the optimal sensing locations to perform recognition and localization operations. The system uses a Bayesian approach to utilize any prior object information (including object models or previously-acquired sensory

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4

Croft, Kaven. "Experimental characterization of automated fiber placement process defects in composite structures." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=97203.

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The Automated Fiber Placement (AFP) process has good potential for manufacturing large composite structures and is used for large scale production. However, the AFP process reveals uncertainties associated with the induced defects. This investigation examines the ultimate strength variation induced by a single gap, overlap, half gap/overlap and twisted tow defects. Tests are carried out on three lamina properties (fiber tension, fiber compression and in-plane shear), two laminate properties (open hole tension and open hole compression) and each was compared with a baseline configuration withou

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5

Prabhakar, Suhas. "A methodology for finite element analysis of curvilinear fiber laminates with defects, fabricated by automated fiber placement technique." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=107876.

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Composite materials have immense capabilities in terms of tailorability and studying in-depth the Automated Fiber Placement (AFP) technique can go a long way in achieving the above goal. Composite laminates fabricated by AFP can also induce defects such as gaps and overlaps. These defects mainly arise in laminates with curvilinear fiber paths. Gaps usually get filled with resin post-curing while the overlaps are thickness build-ups. This makes it important to analyse the effect of these defects and to incorporate these effects while designing and modeling composite laminates. The present work

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6

Rimmel, Oliver [Verfasser], and Peter [Akademischer Betreuer] Mitschang. "Grundlagen der Imprägnierung von Dry Fiber Placement Preforms / Oliver Rimmel ; Betreuer: Peter Mitschang." Kaiserslautern : Technische Universität Kaiserslautern, 2020. http://d-nb.info/1216104867/34.

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7

Völtzer, Klaas [Verfasser]. "Online-Prozessüberwachung von Automated Fiber Placement Prozessen auf Basis der Thermografie / Klaas Völtzer." Garbsen : TEWISS - Technik und Wissen GmbH, 2019. http://www.tewiss-verlag.de/.

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8

Inci, Hasan. "Discrete Fiber Angle And Continuous Fiber Path Optimization In Composite Structures." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614127/index.pdf.

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Fiber orientation angle stands out as one of the most effective design variables in the design optimization of composite structures. During the manufacturing of the composite structures, one can change the fiber orientation according to the specific design needs and constraints to optimize a pre-determined performance index. Fiber placement machines can place different width tows in curvilinear paths resulting in continuous change of the fiber orientation angle in a layer of the composite structure. By allowing the fibers to follow curvilinear paths in the composite structure, modification of

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9

Uhlig, Kai. "Beitrag zur Anwendung der Tailored Fiber Placement Technologie am Beispiel von Rotoren aus kohlenstofffaserverstärktem Epoxidharz für den Einsatz in Turbomolekularpumpen." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-235151.

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In der vorliegenden Arbeit wird die Steifigkeits- und Festigkeitsauslegung von mittels der Tailored Fiber Placement (TFP)-Technologie hergestellten Faser-Kunststoff-Verbunden (FKV) am Beispiel eines einteiligen Rotors aus kohlenstofffaserverstärktem Epoxidharz (CFK) für den Einsatz in Turbomolekularpumpen (TMP) vorgestellt. Im Vergleich zu anderen textilen Fertigungsverfahren können mit Hilfe der TFP-Technologie Verstärkungsfaserrovings in der Ebene variabelaxial, d. h. mit ortsunabhängiger, frei wählbarer Richtung, definiert abgelegt werden. Die sticktechnische Fixierung der Rovings mit Hilfe

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10

Hocke, Tristan [Verfasser]. "Klassifizierung und Untersuchung von thermografisch erfassten Fertigungsfehlern im Automated-Fiber-Placement-Prozess / Tristan Hocke." Garbsen : TEWISS - Technik und Wissen GmbH, 2020. https://www.tewiss-verlag.de/.

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11

Fayazbakhsh, Kazem. "The impact of gaps and overlaps on variable stiffness composites manufactured by automated fiber placement." Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=121454.

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Variable stiffness design of composites, where the fiber orientation changes within the plane of laminates, can improve the structural performance of the laminates, and provide a trade-off between design objectives. Laminates with variable stiffness design can be manufactured with Automated Fiber Placement (AFP) technology. During the manufacturing, certain defects, in the form of gaps and/or overlaps, often emerge and hence affect the structural performance of the composite laminates. The amount of change in structural properties depends on the laminates design and manufacturing parameters. T

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12

Schäfer, Philipp Maximilian [Verfasser]. "Consolidation of carbon fiber reinforced Polyamide 6 tapes using laser-assisted tape placement / Philipp Maximilian Schäfer." München : Verlag Dr. Hut, 2018. http://d-nb.info/1153254905/34.

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13

Spickenheuer, Axel. "Zur fertigungsgerechten Auslegung von Faser-Kunststoff-Verbundbauteilen für den extremen Leichtbau auf Basis des variabelaxialen Fadenablageverfahrens Tailored Fiber Placement." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-147748.

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Seitdem Faser-Kunststoff-Verbunde (FKV) als Leichtbauwerkstoffe für Hochleistungsanwendungen im Luftfahrzeug-, Automobil- und Sportgerätebau eingesetzt werden, erfolgt dies vorrangig mit Hilfe multiaxialer Mehrlagenlaminate. Vergleichsweise neue Fertigungstechnologien, wie die Tailored Fiber Placement (TFP-)Technologie, eröffnen jedoch die Möglichkeit einer gekrümmten, auch als variabelaxial bezeichneten, Ablage von Verstärkungsfäden. Der zugewonnene Freiheitsgrad, den Verstärkungsfasern an jeder beliebigen Stelle eine neue Richtung zuweisen zu können, bedingt aber auch ein komplexes Verständn

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14

Orth, Tilman [Verfasser], Niels [Gutachter] Modler, and Klaus [Gutachter] Drechsler. "LED basiertes Erwärmungssystem für den Einsatz im Automated Fiber Placement / Tilman Orth ; Gutachter: Niels Modler, Klaus Drechsler." Dresden : Technische Universität Dresden, 2021. http://d-nb.info/1232410314/34.

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15

Lan, Marine. "Étude de l’influence des singularités créées par la technique de placement de fibres automatisé sur les performances des matériaux composites." Thesis, Lorient, 2016. http://www.theses.fr/2016LORIS390/document.

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Le procédé de placement de fibres automatisé (AFP) a démontré depuis longtemps ses nombreux atouts pour la fabrication de grandes structures de géométries complexes et variées en matériaux composites. Cependant, un des freins de ce procédé est lié aux singularités pouvant apparaitre lors de l’optimisation des trajectoires de drapage. Dans le cadre de ces travaux de recherche, il a été entrepris de déterminer l’influence de la présence de ces singularités tant au niveau de la microstructure que des propriétés mécaniques. Des singularités de nature et de géométrie différentes telles que des gaps

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16

Kollmannsberger, Andreas [Verfasser]. "Heating characteristics of fixed focus laser assisted Thermoplastic-Automated Fiber Placement of 2D and 3D parts / Andreas Kollmannsberger." München : Verlag Dr. Hut, 2019. http://d-nb.info/1194288979/34.

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17

Dolo, Guillaume. "Étude expérimentale et modélisation du procédé de placement de fibres avec chauffe laser." Thesis, Lorient, 2017. http://www.theses.fr/2017LORIS435.

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L’intérêt croissant de l’industrie aéronautique pour les matériaux composites favorise le développement de procédés de mise en œuvre rapides et automatisés. Technologie approuvée pour la réalisation de stratifiés à matrice thermodurcissable, les cellules de placement de fibres de la société Coriolis Composites permettent la fabrication de pièces stratifiées aux formes et dimensions variées. Ne nécessitant pas de polymérisation longue et onéreuse en autoclave tout en répondant aux nouvelles règlementations environnementales et aux besoins thermomécaniques spécifiques, les composites thermoplast

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18

Kollmannsberger, Andreas [Verfasser], Klaus [Akademischer Betreuer] Drechsler, Klaus [Gutachter] Drechsler, and Paul [Gutachter] Compston. "Heating characteristics of fixed focus laser assisted Thermoplastic-Automated Fiber Placement of 2D and 3D parts / Andreas Kollmannsberger ; Gutachter: Klaus Drechsler, Paul Compston ; Betreuer: Klaus Drechsler." München : Universitätsbibliothek der TU München, 2019. http://d-nb.info/1191897214/34.

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19

Uhlig, Kai [Verfasser], Gert [Akademischer Betreuer] Heinrich, and Lothar [Gutachter] Kroll. "Beitrag zur Anwendung der Tailored Fiber Placement Technologie am Beispiel von Rotoren aus kohlenstofffaserverstärktem Epoxidharz für den Einsatz in Turbomolekularpumpen / Kai Uhlig ; Gutachter: Lothar Kroll ; Betreuer: Gert Heinrich." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://d-nb.info/1160875146/34.

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20

Li, Jing. "Inverse Problems in Structural Mechanics." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/30075.

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This dissertation deals with the solution of three inverse problems in structural mechanics. The first one is load updating for finite element models (FEMs). A least squares fitting is used to identify the load parameters. The basic studies are made for geometrically linear and nonlinear FEMs of beams or frames by using a four-noded curved beam element, which, for a given precision, may significantly solve the ill-posed problem by reducing the overall number of degrees of freedom (DOF) of the system, especially the number of the unknown variables to obtain an overdetermined system. For the b

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21

Falcó, Salcines Olben. "Analysis of process-induced defects on steered-fiber panels for aeronautical applications." Doctoral thesis, Universitat de Girona, 2014. http://hdl.handle.net/10803/284334.

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Currently, the use of Automated Fiber Placement technology allows, large composite aircraft components to be manufactured with high quality materials and introduce new laminate concepts. Among such concepts are the tow-steered panels with curved fibers improved the structural efficiency by means variable stiffness and loading redistribution. However, despite these advantages, conventional laminates with straight fiber architectures are still preferred by designers. The main reason that limits the use of variable stiffness laminates is the incomplete knowledge of the effect of process-induced d

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22

Spickenheuer, Axel [Verfasser], Gert [Akademischer Betreuer] Heinrich, and Lothar [Akademischer Betreuer] Kroll. "Zur fertigungsgerechten Auslegung von Faser-Kunststoff-Verbundbauteilen für den extremen Leichtbau auf Basis des variabelaxialen Fadenablageverfahrens Tailored Fiber Placement / Axel Spickenheuer. Gutachter: Gert Heinrich ; Lothar Kroll. Betreuer: Gert Heinrich." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://d-nb.info/106844746X/34.

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23

Bikhazi, Nicolas W. "MIMO Communication Capacity: Antenna Coupling and Precoding for Incoherent Detection." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1600.pdf.

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24

Di, Francesco Mattia. "Laser-assisted automated fibre placement process development." Thesis, University of Bristol, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.752749.

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25

Hörmann, Philipp [Verfasser]. "Thermoset automated fibre placement – on steering effects and their prediction / Philipp Hörmann." München : Verlag Dr. Hut, 2016. http://d-nb.info/1084387093/34.

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26

Lichtinger, Roland [Verfasser]. "Thermo-Mechanical Coupled Simulation of the Thermoset Automated Fibre Placement Process / Roland Lichtinger." München : Verlag Dr. Hut, 2016. http://d-nb.info/1084386445/34.

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27

Carosella, Stefan [Verfasser]. "Analyse und Verbesserung des Faserablegeverfahrens Tailored Fibre Placement zur kostenoptimierten Preformherstellung / Stefan Carosella." München : Verlag Dr. Hut, 2015. http://d-nb.info/1076437567/34.

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28

Lichtinger, Roland F. X. [Verfasser]. "Thermo-Mechanical Coupled Simulation of the Thermoset Automated Fibre Placement Process / Roland Lichtinger." München : Verlag Dr. Hut, 2016. http://nbn-resolving.de/urn:nbn:de:101:1-2016022626158.

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29

Barasinski, Anaïs. "Modélisations du procédé de placement de fibres composites à matrice thermoplastique." Ecole centrale de Nantes, 2012. http://www.theses.fr/2012ECDN0032.

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Le procédé de placement de fibres thermoplastiques permet de fabriquer des pièces composites de grandes dimensions ayant toutes sortes de géométries (double courbure par exemple). Ce procédé est basé sur le soudage continu par fusion d’un pli composite à matrice thermoplastique sur un substrat. Il reçoit un intérêt croissant au cours des dernières années en raison de sa capacité à réaliser des pièces hors autoclave. Cette étude s’inscrit dans le cadre d’un projet aéronautique qui vise à comprendre et développer ce procédé de dépose automatisé en étudiant l’histoire thermo-mécanique de la matiè

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30

Drivas, Thanos. "Manufacturing Three-dimensional Carbon-fibre Preforms for Aerospace Composites." Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31577.

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Carbon fibre reinforced polymer matrix composites (CF PMCs) are increasingly used in state-of-the-art aerospace applications. Aerospace manufacturers favour components made of CF PMCs over those made of traditional metallic alloys because of their light weight and corrosion resistance, which lead to significant improvements in fuel consump- tion, increased payload capability, and reduced maintenance and inspection costs. How- ever, manufacturing of CF PMC components is performed differently than traditional material in all stages – design, prototyping and production – and therefore, many com-

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31

Waldhart, Chris. "Analysis of Tow-Placed, Variable-Stiffness Laminates." Thesis, Virginia Tech, 1996. http://hdl.handle.net/10919/36781.

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It is possible to create laminae that have spatially varying fiber orientation with a tow placement machine. A laminate which is composed of such plies will have stiffness properties which vary as a function of position. Previous work had modelled such variable-stiffness laminae by taking a reference fiber path and creating subsequent paths by shifting the reference path. This thesis introduces a method where subsequent paths are truly parallel to the reference fiber path. The primary manufacturing constraint considered in the analysis of variable-stiffness laminates was limits on fiber curva

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32

Sharif, Tahir. "Robotic approach to low-cost manufacturing of 3D preforms with dry fibres." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/robotic-approach-to-lowcost-manufacturing-of-3d-preforms-with-dry-fibres(d25f48b9-0d9e-4d78-a2dd-e00da1d127c7).html.

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High-performance fibres such as carbon, glass and kevlar are very promising for aerospace applications because of their high strength, stiffness, impact damage and excellent fatigue life. The high cost of the prepreg materials such as pre-impregnated fibre tape/tow and fabrics, and limitations of existing manufacturing processes are a big challenge for the aerospace industry to meet increasing performance demands. Their benefits can only be achieved by using low cost materials and manufacturing methods. In the past three or four decades, there have been substantial technological developments,

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33

Lichtinger, Roland Franz Xaver [Verfasser], Klaus [Akademischer Betreuer] Drechsler, and Kevin [Akademischer Betreuer] Potter. "Thermo-mechanical coupled simulation of the thermoset Automated Fibre Placement process / Roland Franz Xaver Lichtinger. Betreuer: Klaus Drechsler. Gutachter: Klaus Drechsler ; Kevin Potter." München : Universitätsbibliothek der TU München, 2015. http://d-nb.info/108298230X/34.

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34

Al, Zahr Sawsan. "Planification de réseaux WDM translucides avec qualité de transmission garantie." Phd thesis, Télécom ParisTech, 2007. http://pastel.archives-ouvertes.fr/pastel-00004014.

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De nombreuses études ont été réalisées autour du problème du routage et de l'affectation de longueur d'onde dans les réseaux WDM transparents. La majorité de ces études néglige les effets physiques liés à la transmission sur fibre. En effet, le signal optique subit le long de son trajet plusieurs dégradations, à savoir les effets linéaires et les effets non-linéaires. Dans les réseaux WDM opaques, la qualité du signal optique est considérée comme toujours satisfaisante car le signal est régénéré à chaque nœud du réseau. Cependant, cette faculté de régénération coûte très cher à l'opérateur et

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35

KHAN, SALMAN. "THERMAL CONTROL SYSTEM DESIGN FOR AUTOMATED FIBER PLACEMENT PROCESS." Thesis, 2011. http://spectrum.library.concordia.ca/7393/1/Khan_MASc_F2011.pdf.

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36

Orth, Tilman. "LED basiertes Erwärmungssystem für den Einsatz im Automated Fiber Placement." 2020. https://tud.qucosa.de/id/qucosa%3A74253.

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Der Einsatz kohlenstoﬀfaserverstärkter Kunststoﬀe im Strukturleichtbau ziviler Luftfahrzeuge wird erheblich durch Produktionsautomatisierung getrieben. Einzelne Komponenten der für die Verarbeitung der duroplastischen Werkstoﬀe genutzten Automated-Fiber-Placement Anlagen bieten jedoch noch erhebliches Potential für die Steigerung der Leistungsfähigkeit des Prozesses. Insbesondere ist der prozessspeziﬁsche Entwicklungs- und Kenntnisstand des Erwärmungssystems gegenüber der Verfahrensvariante mit thermoplastischen Werkstoﬀen weniger fortgeschritten. So weisen die dort genutzten Diodenlaser Vorte

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37

"Regenerator placement and fault management in multi-wavelength optical networks." 2011. http://library.cuhk.edu.hk/record=b5894515.

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Shen, Dong.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2011.<br>Includes bibliographical references (p. 98-106).<br>Abstracts in English and Chinese.<br>Abstract --- p.i<br>摘要 --- p.iv<br>Acknowledgements --- p.v<br>Table of Contents --- p.vi<br>Chapter Chapter 1 --- Background --- p.1<br>Chapter 1.1 --- Translucent Optical Networks --- p.1<br>Chapter 1.1.1 --- The Way Towards Translucent --- p.1<br>Chapter 1.1.2 --- Translucent Optical Network Architecture Design and Planning --- p.3<br>Chapter 1.1.3 --- Other Research Topics in Translucent Optical Networks --- p.6<br>Chap

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38

Cai, Xiao. "Determination of Process Parameters for the Manufacturing of Thermoplastic Composite Cones Using Automated Fiber Placement." Thesis, 2012. http://spectrum.library.concordia.ca/974158/1/Cai_MASc_F2012.pdf.

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In-situ fiber placement, in combination with automated tape laying and filament winding, is the key to high-volume production of large-scale composite aerostructures ranging from simple flat plates, to panels with mild curvatures, to complex three-dimensional surfaces, promising reliable, consistent and cost-effective fabrication. However, manufacturing cost, slit tape quality, lack of knowledge and experience of the in-situ consolidation fiber placement process are major barriers preventing aircraft manufacturer from implementing this unique processing technique. This dissertation aims to gai

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39

Uhlig, Kai. "Beitrag zur Anwendung der Tailored Fiber Placement Technologie am Beispiel von Rotoren aus kohlenstofffaserverstärktem Epoxidharz für den Einsatz in Turbomolekularpumpen." Doctoral thesis, 2017. https://tud.qucosa.de/id/qucosa%3A29955.

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In der vorliegenden Arbeit wird die Steifigkeits- und Festigkeitsauslegung von mittels der Tailored Fiber Placement (TFP)-Technologie hergestellten Faser-Kunststoff-Verbunden (FKV) am Beispiel eines einteiligen Rotors aus kohlenstofffaserverstärktem Epoxidharz (CFK) für den Einsatz in Turbomolekularpumpen (TMP) vorgestellt. Im Vergleich zu anderen textilen Fertigungsverfahren können mit Hilfe der TFP-Technologie Verstärkungsfaserrovings in der Ebene variabelaxial, d. h. mit ortsunabhängiger, frei wählbarer Richtung, definiert abgelegt werden. Die sticktechnische Fixierung der Rovings mit Hilf

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40

Spickenheuer, Axel. "Zur fertigungsgerechten Auslegung von Faser-Kunststoff-Verbundbauteilen für den extremen Leichtbau auf Basis des variabelaxialen Fadenablageverfahrens Tailored Fiber Placement." Doctoral thesis, 2013. https://tud.qucosa.de/id/qucosa%3A28180.

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Seitdem Faser-Kunststoff-Verbunde (FKV) als Leichtbauwerkstoffe für Hochleistungsanwendungen im Luftfahrzeug-, Automobil- und Sportgerätebau eingesetzt werden, erfolgt dies vorrangig mit Hilfe multiaxialer Mehrlagenlaminate. Vergleichsweise neue Fertigungstechnologien, wie die Tailored Fiber Placement (TFP-)Technologie, eröffnen jedoch die Möglichkeit einer gekrümmten, auch als variabelaxial bezeichneten, Ablage von Verstärkungsfäden. Der zugewonnene Freiheitsgrad, den Verstärkungsfasern an jeder beliebigen Stelle eine neue Richtung zuweisen zu können, bedingt aber auch ein komplexes Verständn

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