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Dissertations / Theses on the topic 'TEXTILE PREFORMS'

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Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Thammandra, Vidya Sagar. "Structural mechanics of woven preforms and textile composites." Thesis, University of Manchester, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488976.

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The present work deals with the development of comprehensive mechanical models to predict the mechanical properties of woven fabric structures, namely the tensile, bending and compression behaviour. All the models are based on the Rayleigh-Ritz energy method, which allows handling non-linear mechanical properties of constituent yarns while producing computationally efficient algorithms. The models incorporate all modes of deformation, i.e., yarn elongation, yarn bending and yarn compression. An effort has been made to make the models more general by considering generalised geometry with adequate degrees of freedom to represent the yarn path under all deformed configurations. A new geometric model based on polynomial geometry has been developed and it has been shown that the mechanical models based on the new geometry closely simulate fabric tensile behaviour. The model developed for plain woven fabric has been generalised to predict the tensile behaviour of regular non-plain woven fabrics by specifying the number of crossovers and number of floats in a weave repeat and it was shown to give consistent predictions for different fabric structures. The pure bending behaviour of plain woven fabrics has been studied considering both a single 5th degree polynomial and a piecewise Hermite polynomial geometry. The deformed state is obtained using the principle of stationary potential energy without invoking work-energy theorem and hence they predict the complete moment-curvature relationship of fabric. The compression behaviour of single fabric has been studied by characterising the yam compression behaviour using an inverse method and the compression behaviour of double fabrics has also been modelled. The solution of models using non-linear programming constrained minimisation techniques has been demonstrated using readily available optimisation software. The models have been validated against the data reported in the literature along with the experimental results of glass fabrics. The predictions of models have also been compared against the results of Finite Element Analysis (FEA) using the general purpose FEA software ABAQUS. The compaction of fabric between two rigid plates has been simulated using 3D FEA. The geometry of yarn path derived from the mechanical models has been used to construct 3D FEA models for studying the micro-mechanical behaviour of plain woven fabric composites.

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2

Davis, Jill Benea. "Three-dimensional multilayer woven fabrics as composite preforms." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/12437.

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3

Souter, Benjamin John. "Effects of fibre architecture on formability of textile preforms." Thesis, University of Nottingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275070.

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4

Tung, Peter So Wah. "Design and development of three-dimensional multilayer woven preforms for composites." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/8686.

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5

Zhu, Bo. "Sheet forming of woven textile composite preforms : formability and wrinkling /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?MECH%202007%20ZHU.

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6

Früh, Hans-Christian [Verfasser]. "Produktorientierte Auswahl von Handhabungstechnologien für textile Preforms / Hans-Christian Früh." Düren : Shaker, 2019. http://d-nb.info/1201296080/34.

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7

Saboktakin, Rizi Abbasali. "Integrity assessment of preforms and thick textile reinforced composites for aerospace applications." Mémoire, École de technologie supérieure, 2013. http://espace.etsmtl.ca/1267/1/SABOKTAKIN_RIZI_Abbasali.pdf.

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Les composites à renforts textiles 3D, contenant des fibres dans le plan et dans la direction de l'épaisseur, offrent certains avantages par rapport aux composites à renforts textiles 2D. Ces avantages comprennent une grande résistance à la délamination et une meilleure tolérance à l'endommagement. La plupart des textiles 3D ont été développés pour des pièces destinées à l'industrie aérospatiale telles que des panneaux d'ailes, des trains d'atterrissage, des tuyères de fusée et la capsule Orion. Cette thèse vise à évaluer l'intégrité structurelle des textiles composites en combinant des techniques d'inspection destructives et non destructives. Dans la première partie de la thèse, des techniques non destructives, y compris les rayons-X (CT) et des techniques basées sur les ultrasons (UT), ont été développées pour détecter les défauts importants comme la rupture des fibres et le désalignement des tissus. La deuxième partie porte sur l'étude de l'influence des défauts de fabrication qui se produisent dans les processus d’ touffetage sur les performances mécaniques. Des résultats expérimentaux ont montré que tomographie rayons-X facilite la détection et la caractérisation de ces deux défauts de fabrication, ainsi que de l'architecture des tissus. En outre, la modélisation méso-échelle d'un composite tissé en 2D a été réalisée avec succès pour l'analyse de l'influence du défaut de rupture des fibres et de l'architecture des fibres de propagation de l'onde. Les résultats expérimentaux montrent que le touffetage des préforme limite ou élimine le mouvement de leurs fils. En plus, la touffetage par des fils de haute résistance à la traction peut améliorer celle de leurs préforme 3D. La touffe d’un préforme fait augmenter la force de compactage des fibres. À cet effet, cette méthode est nécessaire pour augmenter le volume des fibres de plus de 50 % en comparaison d'un préforme non touffeté. La résistance à la déformation d'une préforme est influencée par l’opération de touffetage. En effet, une préforme touffetée est plus résistance à la déformation qu’une préforme non touffetée. La variation de la géométrie de la préforme a été mesurée par balayage laser. En outre, la capacité CT a été étudiée en tant que moyen pour reconnaître les formes et les emplacements des vides dans les matériaux composites. La résistance à la traction des composites avec un touffetage transversale a eu moins de réduction de que celle avec touffetage longitudinal. Les tests de fatigue à haute vitesse de déformation montrent que les composites touffetés ont une durée de vie inférieure à celle des composite non touffetés. L’opération de touffetage permet d'améliorer les propriétés mécaniques des panneaux sandwichs à noyau en nid d'abeilles sollicités en compression locale et en flexion trois points. Les dommages sont souvent initiés dans les régions riches en résine qui entourent le renfort de touffetage. L'acceptation primaire de l’utilisation des composites touffetés 3D dans les structures aérospatiales est très dépendantes de l'exactitude et de la fiabilité des données expérimentales pour identifier le degré auquel les renforts améliorent ou dégradent les propriétés mécaniques. Dans cette thèse, la corrélation entre les préformes touffues, les propriétés des composites et leurs modifications dues au touffetage sont traités pour une configuration spécifique. Les données expérimentales sont présentées à la fois sur un taux faible et à haut débit statique et des forces de fatigue à différents niveaux de contrainte. L'examen microstructural est effectué en utilisant la microscopie à haute résolution et les techniques de CT. Les résultats de cette thèse contribuent à l'enquête sur la tolérance d'intégrité et de dommage dans les matériaux composites tuftés 3D en vue d'une certification pour l'utilisation dans les futurs avions de transport. Cependant, la certification des composites tuftés pour les applications aérospatiales est toujours problématique en raison de l'absence de techniques d'évaluation non destructive fiables pour leur inspection et les facteurs de fabrication peuvent influencer considérablement leur performance, il s'agit d'un problème important auquel on doit s’attaquer dans le domaine de composite pour l’aérospatial.

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8

Rudov-Clark, Shoshanna Danielle, and srudov-clark@phmtechnology com. "Experimental Investigation of the Tensile Properties and Failure Mechanisms of Three-Dimensional Woven Composites." RMIT University. AEROSPACE, MECHANICAL AND MANUFACTURING ENGINEERING, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080808.115853.

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This PhD thesis presents an experimental investigation into the tensile properties, strengthening mechanics and failure mechanisms of three-dimensional (3D) woven composites with through-the-thickness (z-binder) reinforcement. 3D composites are being developed for the aerospace industry for structural applications in next-generation aircraft, such as wing panels, joints and stiffened components. The use of 3D woven composites in primary aircraft structures cannot occur until there has been a detailed assessment of their mechanical performance, including under tensile loading conditions. The aim of this PhD project is to provide new insights into the in-plane tensile properties, fatigue life, tensile delamination resistance and failure mechanisms of 3D woven composites with different amounts of z-binder reinforcement. Previous research has revealed that excessive amounts of z-binder reinforcement dramatically improves the tensile delamination toughness, but at the expense of the in-plane structural properties. For this reason, this PhD project aims to evaluate the tensile performance of 3D woven composites with relatively small z-binder contents (less than ~1%). The research aims to provide a better understanding of the manufacture, microstructure and tensile properties of 3D woven composites to assist the process of certification and application of these materials to aircraft structures as well as high performance marine and civil structures.

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9

Verghese, Kandathil Eapen. "Effects of fiber architecture and through-the-thickness stitching on permeability and compaction of textile preforms." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-08292008-063741/.

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10

Hou, Yi. "Experimental characterization and modeling of the permeability of fibrous preforms using gas for direct processes application." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2012. http://tel.archives-ouvertes.fr/tel-00848600.

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A methodology to measure in-plane permeability of fibrous media using a transient one dimensional air flow is developed. The method, based on the measurement of gas pressure at the boundaries throughout the transient flow, is convenient, clean and fast, avoids usage of a gas flow meter and offers a way to study the gas transport within fibrous media. The gas transport through fibrous porous media is described by several models to comply with different flow regimes. The permeability, only depending on the fibrous structure, is determined by inverse method, fitting the simulation results to the experimental data obtained using rising or dropping pressure methods. The results of viscous permeability Kv of Glass/Carbon Twill Woven fabrics (viscous permeability Kv ranging from 10-11 to 10-10 m2) measured using gas match well the permeability measured with liquid compression and injection techniques from previous works. The deviation from Darcy's law caused by gas sliding effect on low permeability Carbon Uni-Directional fabrics (Kv from 10-14 to 10-12 m2) is analyzed and a related parameter of fabric material shows a dependence in permeability, with a similar trend as the Klinkenberg sliding parameter in soils and rocks.The experimental errors due to dimensions, thermal effect, pressure variation, sample handling, and trapped gas at boundaries are analyzed. It comes out that the sensitivities of pressure sensors and trapped gas volumes at the boundaries have the most important effects. A design for 2D measurement using gas to obtain 2D permeability tensor in one single test is proposed to avoid the issues of trapped gas at boundaries. Simulated experiments show that the measurements based on pressure measured at three proposed locations could provide robust and accurate results for fabrics of anisotropic permeability ratios (K1/K2) ranging from 0.1 to 10, with various principal permeability direction orientations.

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11

Sankaran, Vignaesh, Tristan Ruder, Steffen Rittner, Evelin Hufnagl, and Chokri Cherif. "A multiaxial warp knitting based yarn path manipulation technology for the production of bionic-inspired multifunctional textile reinforcements in lightweight composites." Sage, 2016. https://tud.qucosa.de/id/qucosa%3A35615.

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Composites have now revolutionized most industries, like aerospace, marine, electrical, transportation, and have proved to be a worthy alternative to other traditional materials. However for a further comprehensive usage, the tailorability of hybrid composites according to the specific application needs on a large-scale production basis is required. In this regard, one of the major fundamental research fields here involves a technology development based on the multiaxial warp-knitting technique for the production of bionic-inspired and application-specific textile preforms that are force compliant and exhibit multi-material design. This article presents a newly developed yarn (warp) path manipulation unit for multiaxial warp-knitting machines that enables a targeted production of customized textile preforms with the above characteristics. The technological development cycle and their experimental validation to demonstrate the feasibility of new technology through production of some patterns for different field of applications are then discussed.

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12

Chordia, Sanjay. "Optimization of 3-D woven preform for textile composites." Thesis, University of Manchester, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.502858.

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13

Wong, Chee Chiew. "Modelling the effects of textile preform architecture on permeability." Thesis, University of Nottingham, 2006. http://eprints.nottingham.ac.uk/10294/.

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Liquid Composite Moulding (LCM) processes are identified as one of the most potentially advantageous manufacturing routes. The challenge currently is to increase their reliability and expand their applicability. To that end, it was perceived that there was a lack of an advanced integrated simulation tool for the manufacture of three-dimensional, multi-layer textile composites. The tools for the analyses of fabric forming and subsequent flow during LCM processes were simple and immature, with the latter suitable to describe flow in thin structures only. Another noted deficiency was that the simulations provided a single answer to any given problem. Industrial experience has shown that during mould filling, due to the nature of statistical variation in the material properties, the filling patterns and arising cycle times are rarely the same between a given set of identical mouldings. This thesis focuses on permeability prediction of textile reinforcements for LCM processes. The issue of textile variability was also explored through the use of the permeability models' predictive capability. Two novel and efficient numerical approaches were developed to predict textile permeability based on the fabric architecture. The objective was to reduce the complexity of the flow domain and hence provide a faster method to fully characterise the permeability of a textile. Within a wider context, these models were implemented within an integrated modelling framework encompassing draping, compaction and impregnation, based on the TexGen textile schema. TexGen is a generic geometric textile modeller that can be used to create a wide range of textile models. Several validation studies were performed using a range of reinforcements including woven and non-crimp fabrics. A stochastic analysis technique was developed to account for the effect of material variability on permeability. The study based on this technique provided important insights into permeability variations. It was shown that the permeability distribution is a strong function of the textile architecture. The permeability models developed from this work can be used to account for the effects of fabric shear/compaction and statistical variations on permeability. These predicted permeability data can complement experimental data in order to enhance flow simulations at the component scale.

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14

Klingele, Josef [Verfasser]. "Produktorientierte Auswahl von Verfahren zur Vorfixierung textiler Preforms / Josef Klingele." Aachen : Shaker, 2014. http://d-nb.info/1058315188/34.

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15

Brabandt, Daniel [Verfasser]. "Qualitätssicherung von textilen Kohlenstofffaser-Preforms mittels optischer Messtechnik / Daniel Brabandt." Aachen : Shaker, 2018. http://d-nb.info/1186590343/34.

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16

Böhler, Patrick [Verfasser]. "Einzelfadenbasierte Modellierung von textilen Preform-Prozessen / Patrick Böhler." München : Verlag Dr. Hut, 2019. http://d-nb.info/1200755502/34.

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17

Berger, Dietrich [Verfasser]. "Qualitätssicherung von textilen Kohlenstofffaser-Preforms mittels prozessintegrierter Wirbelstromsensor-Arrays / Dietrich Berger." Aachen : Shaker, 2019. http://d-nb.info/1188552597/34.

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18

Kordi, Mohannad Tarsha. "Entwicklung von Roboter-Endeffektoren zur automatisierten Herstellung textiler Preforms für Faserverbundbauteile." Aachen Shaker, 2009. http://d-nb.info/996090908/04.

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19

Brabandt, Daniel [Verfasser], and G. [Akademischer Betreuer] Lanza. "Qualitätssicherung von textilen Kohlenstofffaser-Preforms mittels optischer Messtechnik / Daniel Brabandt ; Betreuer: G. Lanza." Karlsruhe : KIT-Bibliothek, 2018. http://d-nb.info/1165143100/34.

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20

Cetin, Mesut [Verfasser]. "Formwerkzeuge aus Leichtschaum zur Herstellung, Lagerung und Transport textiler Preforms für Faserverbundwerkstoffe / Mesut Cetin." Aachen : Shaker, 2016. http://d-nb.info/1122545584/34.

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21

Tarsha, Kordi Mohannad [Verfasser]. "Entwicklung von Roboter-Endeffektoren zur automatisierten Herstellung textiler Preforms für Faserverbundbauteile / Mohannad Tarsha Kordi." Aachen : Shaker, 2009. http://d-nb.info/1159834814/34.

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22

Zhao, Nuoping. "Nähen als Montageverfahren textiler Preforms und Wirkungen der Nähte auf lokale mechanische Eigenschaften thermoplastischer Faserverbundwerkstoffe." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1233315002416-48443.

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Faserverbundwerkstoffe werden häufiger für Leichbauanwendungen eingesetzt. Thermoplastische Matrixmaterialien gewinnen in der letzten Zeit immer mehr an Bedeutung wegen höherer Produktivität, niedriger Kosten und besserer Umweltfreundlichkeit sowie Recyclingsfähigkeit. Im Rahmen des Projektes SFB 639 werden Spacer-Strukturen aus GF (Glas)- und PP (Polypropylen)-Filamenten verstärkten Textilien hergestellt. Die vorliegende Arbeit beschäftigt sich mit der Montage von textilen Preformen mittels Nähtechnik und den mechanischen Eigenschaften genähter thermoplastischer Faserverbundwerkstoffe. Das Ziel ist, durch Untersuchungen der Festigkeitseigenschaften von genähten thermoplastischen Faserverbundwerkstoffen die Möglichkeiten gezielter Verbesserung der mechanischen Eigenschaften herauszufinden. Als Versuchsmaterial werden Twintex®-Gewebe und Mehrlagengestrick (hergestellt im ITB) aus GF- und PP-Filamenten verwendet. Durch Zug-, Schub-, Biege- und interlaminare Scherfestigkeitsuntersuchungen ist festzustellen, dass das Nähen an mehrschichtigen thermoplastischen faserverstärkten Verbundwerkstoffe positiv wirken kann. Durch Verwenden thermoplastischer Nähfäden wie beispielsweise Polyester-Nähfäden kann die Zugfestigkeit des Verbundes sogar erhöht werden. Ohne Verminderung der Zugfestigkeit kann das Nähen die Schlagzähigkeit thermoplastischer Faserverbundwerkstoffe wesentlich erhöhen. Bei der Schlagbelastung erzeugen die Nähte neue Arten des Bruchs, so dass mehr Energie aufgenommen wird. Durch das Nähen lässt sich die Schlagzähigkeit besonders bei Faserverbundwerkstoffen mit thermoplastischer Matrix bei niedrigen Temperaturen erhöhen. Die Zugfestigkeitsuntersuchungen von genähten überlappenden Faserverbunden zeigen, dass das Nähen die Zugfestigkeit überlappender Bauteile leicht erhöhen kann. Die Erfahrungen mit der Wirkung von Überlappungen der Verstärkungstextilien in Faserverbundbauteilen mit duromerer Matrix sind nicht auf thermoplastische Matrices zu übertragen. Der Konsolidierungsprozess mit thermoplastischer Matrix mittels Presstechnologie erzwingt eine konstante Wandstärke, so dass lokal im Überlappungsbereich ein erhöhter Faservolumenanteil theoretisch zu erwarten und praktisch nachgewiesen ist. Zur Vorbereitung der Montage von Faserverbundbauteilen kann das Einbringen von Löchern zur Aufnahme von Bolzen oder Schrauben erforderlich sein. Ein Konzept für ein maschinelles Verfahren zur Lochverstärkung wird in dieser Arbeit vorgeschlagen. Der Konstrukteur von Faserverbundbauteilen muss außerdem berücksichtigen, dass ein Gewinn an Schlagzähigkeit mit Verlusten bei den In-Plane-Eigenschaften verbunden ist. Durch eine optimale Wahl der Nahtparameter lassen sich gewünschte Eigenschaften des Faserverbundwerkstoffes einstellen. Trotz vielfältiger, auch berechtigter Kritik besitzt das Nähen als Montageverfahren für Preformen eine Perspektive, wenn die Nähte zielführend positioniert und schonende Nähprozessbedingungen gewährleistet werden.

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23

Zhao, Nuoping. "Nähen als Montageverfahren textiler Preforms und Wirkungen der Nähte auf lokale mechanische Eigenschaften thermoplastischer Faserverbundwerkstoffe." Doctoral thesis, Technische Universität Dresden, 2007. https://tud.qucosa.de/id/qucosa%3A23907.

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Faserverbundwerkstoffe werden häufiger für Leichbauanwendungen eingesetzt. Thermoplastische Matrixmaterialien gewinnen in der letzten Zeit immer mehr an Bedeutung wegen höherer Produktivität, niedriger Kosten und besserer Umweltfreundlichkeit sowie Recyclingsfähigkeit. Im Rahmen des Projektes SFB 639 werden Spacer-Strukturen aus GF (Glas)- und PP (Polypropylen)-Filamenten verstärkten Textilien hergestellt. Die vorliegende Arbeit beschäftigt sich mit der Montage von textilen Preformen mittels Nähtechnik und den mechanischen Eigenschaften genähter thermoplastischer Faserverbundwerkstoffe. Das Ziel ist, durch Untersuchungen der Festigkeitseigenschaften von genähten thermoplastischen Faserverbundwerkstoffen die Möglichkeiten gezielter Verbesserung der mechanischen Eigenschaften herauszufinden. Als Versuchsmaterial werden Twintex®-Gewebe und Mehrlagengestrick (hergestellt im ITB) aus GF- und PP-Filamenten verwendet. Durch Zug-, Schub-, Biege- und interlaminare Scherfestigkeitsuntersuchungen ist festzustellen, dass das Nähen an mehrschichtigen thermoplastischen faserverstärkten Verbundwerkstoffe positiv wirken kann. Durch Verwenden thermoplastischer Nähfäden wie beispielsweise Polyester-Nähfäden kann die Zugfestigkeit des Verbundes sogar erhöht werden. Ohne Verminderung der Zugfestigkeit kann das Nähen die Schlagzähigkeit thermoplastischer Faserverbundwerkstoffe wesentlich erhöhen. Bei der Schlagbelastung erzeugen die Nähte neue Arten des Bruchs, so dass mehr Energie aufgenommen wird. Durch das Nähen lässt sich die Schlagzähigkeit besonders bei Faserverbundwerkstoffen mit thermoplastischer Matrix bei niedrigen Temperaturen erhöhen. Die Zugfestigkeitsuntersuchungen von genähten überlappenden Faserverbunden zeigen, dass das Nähen die Zugfestigkeit überlappender Bauteile leicht erhöhen kann. Die Erfahrungen mit der Wirkung von Überlappungen der Verstärkungstextilien in Faserverbundbauteilen mit duromerer Matrix sind nicht auf thermoplastische Matrices zu übertragen. Der Konsolidierungsprozess mit thermoplastischer Matrix mittels Presstechnologie erzwingt eine konstante Wandstärke, so dass lokal im Überlappungsbereich ein erhöhter Faservolumenanteil theoretisch zu erwarten und praktisch nachgewiesen ist. Zur Vorbereitung der Montage von Faserverbundbauteilen kann das Einbringen von Löchern zur Aufnahme von Bolzen oder Schrauben erforderlich sein. Ein Konzept für ein maschinelles Verfahren zur Lochverstärkung wird in dieser Arbeit vorgeschlagen. Der Konstrukteur von Faserverbundbauteilen muss außerdem berücksichtigen, dass ein Gewinn an Schlagzähigkeit mit Verlusten bei den In-Plane-Eigenschaften verbunden ist. Durch eine optimale Wahl der Nahtparameter lassen sich gewünschte Eigenschaften des Faserverbundwerkstoffes einstellen. Trotz vielfältiger, auch berechtigter Kritik besitzt das Nähen als Montageverfahren für Preformen eine Perspektive, wenn die Nähte zielführend positioniert und schonende Nähprozessbedingungen gewährleistet werden.

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24

Jetavat, Dhavalsinh. "Near net shape preforming by 3D weaving process." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/near-net-shape-preforming-by-3d-weaving-process(bb697182-f424-480b-963a-dc49b84425c6).html.

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Significant proportion of composite industry is currently produced using prepregs, cured in autoclave which is very expensive and time consuming process. Dry textile preforms in conjunction with liquid molding techniques can lead to significant reductions in material costs, manufacturing costs and cycle times. These dry preforms are typically 2D woven or braided fabrics which also required lay-up and have low interlaminar properties. Through thickness reinforcement provides solution for this problem as it gives better interlaminar properties as well as near net shape performing. Various 3D performing methods are discussed and reviewed in this research where 3D weaving comes out as ideal process to develop near net shape preforms with more efficiency and better material performance. This research highlights the advantages and limitations of conventional 3D weaving processes. A number of approaches for improving the flexibility of 3D weaving process have been presented including changing fiber architecture in different sections of the preform, tapering in the width and thickness directions and finally to change the fiber orientation. It is concluded that multi step and taper fabrics can be produced on conventional weaving by some modifications. Furthermore, a novel 3D weaving machine is designed and developed after reviewing various patents and weaving methods to overcome limitations of conventional weaving machine. Key criterions from limitations of conventional weaving processes are considered and modified such as multiple weft insertion, limited warp stuffer movement, linear take-up to develop 3D weaving machine. In order to achieve isotropic material, two textile technologies are combined to get final requirements. 3D weaving can provide us fibres in 0° and 90° direction with through thickness reinforcement, whereas braiding can satisfy the requirement of bias direction fibres. Near net shape preforms such as taper and multistep are produced and laminated. Preliminary testing is performed on these laminates to evaluate fibre architectures. Further work is required in terms of machine modification which can provide weave design flexibility to explore various multilayer weave architectures. Thorough testing is required to evaluate and define structure performance and effect of fibre damage during weaving process.

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25

Tröltzsch, Jürgen [Verfasser]. "Spritzgießtechnische Direktimprägnierung textiler Halbzeuge und Preformen bei komplexen Hochleistungsbauteilen / Jürgen Tröltzsch." München : Verlag Dr. Hut, 2012. http://d-nb.info/1028784090/34.

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26

Heß, Christoph [Verfasser]. "Beitrag zur Qualitätssicherung für die serientaugliche Herstellung von textilen Preformen / Christoph Heß." München : Verlag Dr. Hut, 2016. http://d-nb.info/1097817792/34.

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27

Do, Pete Binh. "Effect of textile preform structure on the mechanical properties and failure modes of composites from resin transfer molding process." Thesis, Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/8512.

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28

Carvalho, Vladimir Anderson Marinho de. "Fabrica??o de malha de trama utilizada como pr?-formas na ind?stria de comp?sitos e avalia??o das propriedades mec?nicas." Universidade Federal do Rio Grande do Norte, 2008. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15576.

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In the manufacture of composite, textile materials are being used as reinforcement. Generally, the combination of the matrix with the textile material in the form of fibres or yarns is used depending on their distribution in the web. In the present work, in place of fibres or yarns, a knitted structure in the form of the final product which is defined as preform. The preform is weft knit manufactured with polyester filaments. In the manufacture of composite, polyester resin was used as matrix. The physical and mechanical properties as well as the formability of the weft knit were analysed. The physical and mechanical properties as well as the formability of the knitted structure were analysed. The results obtained on the analysis show that the courses and wales of the weft knit structure and the tensile properties help the formability of the structure and the impregnation of the resin. It could be clearly observed that composite structure in the direction of the courses support more tension than in the direction of the wales. In relation to the three points flexural tests it was possible to note that there was more flexion in the direction of wales, what was expected. It was also possible to note that there are other advantages such as reduction in the loss of materials used, homogeneity in the distribution of the knitted structure in the mould, reduction in the preparation time and also in the reduction in the cost of manufacture
Na fabrica??o de comp?sitos, resultados da jun??o da resina como matriz e o material t?xtil como refor?o, o material t?xtil usualmente utilizado como refor?o, est? no formato de filamentos ou fibras soltas, que s?o aplicados diretamente sobre um molde, essa distribui??o aleat?ria do material pode ocasionar pontos fracos na estrutura j? que n?o garante uma distribui??o homogenia. No presente trabalho, em vez de fios ou fibras, foi utilizada uma malha t?xtil, fabricada na forma do produto final, que defini-se como pr?-forma, melhorando a distribui??o do material sobre o molde,. Esta pr?-forma foi fabricada em malha de trama (malha Jersey) com filamento de poli?ster e a resina de poli?ster foi utilizada como matriz na fabrica??o desse comp?sito. As propriedades f?sicas, mec?nicas e formabilidade das la?adas foram analisadas. Os resultados das propriedades da malha Jersey estudadas mostram que as la?adas da malha e as propriedades tensil ajudam a formabilidade da estrutura e a facilitam a impregna??o da resina. Claramente pode-se observar que a estrutura de comp?sito na dire??o de coluna suporta maior tens?o em compara??o com a estrutura na dire??o da carreira. Com rela??o ao teste de flex?o de tr?s pontos, foi poss?vel verificar maior flex?o no sentido da carreira, o que foi esperado. Foi poss?vel pontuar tamb?m outras vantagens como a redu??o de perdas de materiais, homogeneidade na distribui??o da estrutura de malha no molde, redu??o do tempo de produ??o e barateamento nos custos produtivos

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Heß, Christoph Verfasser], Klaus [Akademischer Betreuer] Drechsler, and Thorsten [Akademischer Betreuer] [Schüppstuhl. "Beitrag zur Qualitätssicherung für die serientaugliche Herstellung von textilen Preformen / Christoph Heß. Betreuer: Klaus Drechsler. Gutachter: Klaus Drechsler ; Thorsten Schüppstuhl." München : Universitätsbibliothek der TU München, 2016. http://d-nb.info/1088724833/34.

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Heß, Christoph [Verfasser], Klaus Akademischer Betreuer] Drechsler, and Thorsten [Akademischer Betreuer] [Schüppstuhl. "Beitrag zur Qualitätssicherung für die serientaugliche Herstellung von textilen Preformen / Christoph Heß. Betreuer: Klaus Drechsler. Gutachter: Klaus Drechsler ; Thorsten Schüppstuhl." München : Universitätsbibliothek der TU München, 2016. http://nbn-resolving.de/urn:nbn:de:bvb:91-diss-20160201-1246228-1-3.

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Caba, Aaron C. Jr. "Verification of a Three-Dimensional Resin Film Infusion Proecss Simulation Model." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36572.

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This investigation completed the verification of a three-dimensional resin transfer molding/resin film infusion (RTM/RFI) process simulation model. The model incorporates resin flow through an anisotropic carbon fiber preform, cure kinetics of the resin, and heat transfer within the preform/tool assembly. The computer model can predict the flow front location, resin pressure distribution, and thermal profiles in the modeled part. The formulation for the flow model is given using the finite element/control volume (FE/CV) technique based on Darcy's Law of creeping flow through a porous media. The FE/CV technique is a numerically efficient method for finding the flow front location and the fluid pressure. The heat transfer model is based on the three-dimensional, transient heat conduction equation, including heat generation. Boundary conditions include specified temperature and convection. The code was designed with a modular approach so the flow and/or the thermal module may be turned on or off as desired. Both models are solved sequentially in a quasi-steady state fashion. A mesh refinement study was completed on a one-element thick model to determine the recommended size of elements that would result in a converged model for a typical RFI analysis. Guidelines are established for checking the convergence of a model, and the recommended element sizes are listed. Several experiments were conducted and computer simulations of the experiments were run to verify the simulation model. Isothermal, non-reacting flow in a T-stiffened section was simulated to verify the flow module. Predicted infiltration times were within 12-20 percent of measured times. The predicted pressures were approximately 50 percent of the measured pressures. A study was performed to attempt to explain the difference in pressures. Non-isothermal experiments with a reactive resin were modeled to verify the thermal module and the resin model. Two panels were manufactured using the RFI process. One was a stepped panel and the other was a panel with two `T' stiffeners. The difference between the predicted infiltration times and the experimental times was 4 to 23 percent.
Master of Science

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Zhao, Nuoping [Verfasser]. "Nähen als Montageverfahren textiler Preforms und Wirkungen der Nähte auf lokale mechanische Eigenschaften thermoplastischer Faserverbundwerkstoffe / Zhao, Nuoping." 2007. http://d-nb.info/992863007/34.

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