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Dissertations / Theses on the topic 'Glass fabric'
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Chen, Xin. "High temperature performance of glass fabric/polyimide composites." Thesis, Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/11165.
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Belmonte, H. M. S. "Notched strength of woven fabric composites." Thesis, University of Surrey, 2002. http://epubs.surrey.ac.uk/774243/.
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Yan, Ying. "Finite element analysis and characterisation of fibre and fabric reinforced composites." Thesis, University of Ulster, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385688.
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Miller, Leah Margaret. "Characterization of extended chain polyethylene/S-2 glass, interply hybrid, fabric composites." Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/8623.
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Rios, Soberanis Carlos Rolando. "A study of damage accumulation in a knitted fabric reinforced composite." Thesis, University of Surrey, 2002. http://epubs.surrey.ac.uk/843102/.
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The use of knitting technology with advanced fibres such as glass, carbon and aramid, to produce near-net-shape fabrics has in recent years received increasing interest from the composite materials community. Knitted fabrics have the potential of being used in engineering structures with complex shapes in conjunction with a suitable liquid moulding technique, such as Resin Transfer Moulding (RTM), due to their excellent drapeability and manufacturability. During previous studies in textile reinforced composites, an intimate relationship between the fabric architecture and the damage development has been demonstrated. In this work, the quasi-static tensile loading deformation behaviour and the relation between the fabric architecture and damage development have been studied for a weft knitted glass fabric. Tensile properties have been examined and the failure mechanisms have been identified experimentally by analysing the damage process in-situ with a camera and by studying fracture surfaces using scanning electron microscopy (SEM). The acoustic emission technique was used to support the microscopic analysis. The work has investigated the tensile properties and failure mechanisms of three knitted fabric reinforced composite laminates reinforced with a Milano weft knitted glass fabric. The three composites were (i) a single layer of fabric reinforcing epoxy resin, (ii) a single knitted fabric layer sandwiched between 0° glass fibre unidirectional plies (again with the glass reinforcing epoxy resin), and (iii) the same knitted glass fabric but this time used as the reinforcement in commercially produced high fibre volume fraction composites (using the RTM technique). The variation of mechanical properties with angle (from wale to course) has been measured for the single layer of the fabric reinforcing epoxy resin by orientating the wale direction of the fabric at different angles. Mechanical properties have been measured for each angular orientation and comparisons were made between them, especially with regard to the planes of final failure. The single layer composites failed as soon as the first damage was initiated. Hence, to investigate damage accumulation, a novel technique was employed to manufacture a sandwich laminate, which consisted in placing a single knitted fabric layer between 0° glass fibre unidirectional plies. The success of this method is that the accumulation of damage in the knitted architecture was allowed to be studied and some characteristics of crack initiation and crack propagation could be related to the fabric geometry and structure. Experiments on these model transparent materials have been complemented by tests on two types of commercial knitted fabric composite manufactured by the RTM process. Characterization of these materials under tensile loading has been carried out for monotonic and cyclic loading and the results have been compared with those found for the single layer and the sandwich model material. Various failure mechanisms such as cracking at loop cross-over points, resin matrix cracking, fibre bundle debonding and tensile fracture of fibre bundles in failed specimens were observed. The behaviour of the commercial RTM specimens has been discussed in the light of the results obtained from the model single layer and sandwich specimens.
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Manger, Christopher I. C. "Failure of notched woven GFRP composites : damage analysis and strength modelling." Thesis, University of Surrey, 1999. http://epubs.surrey.ac.uk/738/.
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Aramah, Simon Ejechi. "Significance of damage in composite materials." Thesis, University of London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249312.
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Soranakom, Chote, and Barzin Mobasher. "Flexural Analysis and Design of Textile Reinforced Concrete." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1244046537373-61938.
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A model is presented to use normalized multi-linear tension and compression material characteristics of strain-hardening textile reinforced concrete and derive closed form expressions for predicting moment-curvature capacity. A set of design equations are derived and simplified for use in spreadsheet based applications. The model is applicable for both strain-softening and strainhardening materials. The predictability of the simplified model is checked by model calibration and development of design charts for moment capacity and stress developed throughout the cross section of a flexural member. Model is calibrated by predicting the results of Alkali Resistant Glass and Polyethylene fabrics. A case for the flexural design of Glass Fiber Reinforced Concrete (GFRC) specimen as a simply supported beam subjected to distributed load is used to demonstrate the design procedure.
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Perkins, Elizabeth W. "Conversations With the Self: An Artist's Visual & Written Wanderings." VCU Scholars Compass, 2004. http://scholarscompass.vcu.edu/etd/872.
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The thesis is made up of episodes in which I am in dialogue with myself, sometimes in dialogue with the work, and yet other times I am speaking directly to the reader/viewer. The tense also sways from past to present as frequently as the visual language does. The following episodes are a selection of writings from my final year at graduate school. The episodes express my influences, inspirations, theories, and philosophies as a person and a maker. I think of these things as what allows me to wander and then wander somewhere else completely different within the same landscape. I feel it is important for an audience to experience these wanderings. I feel it is more valid for you to read exactly what I am thinking rather than to tell you about what I am thinking and making, because it is an expression of my relationship with my work. The images are supplemental to the writing. The images and writings fit together in that they inform one another. That is not to say that the ideas do not always transfer literally from image to writing but that they are what is thought about simultaneously through out my creative process. Most importantly I have developed through my graduate experience an intense relationship with the work. This is the most important relationship an artist has, the one with his or her work. It is deep and enriching, at times painful and frustrating, and at its best surprising, amazing, and even glorious. This is what I have to share through my thesis.
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Garbin, Daniel Fernando. "Efeito do material da face nas propriedades mecânicas de painéis sanduíche para aplicação rodoviária." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/157831.
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Painéis sanduíche são largamente utilizadas em diversas aplicações de engenharia e o estudo de suas propriedades é fundamental para a ampliação de sua utilização. Neste trabalho, foram estudados painéis sanduíche com núcleo de poliuretano e faces de fibra de vidro fabricados pelo processo de laminação contínua. Na primeira configuração, as faces do painel foram fabricadas com manta de fibra de vidro e resina poliéster, com 39% de teor de vidro em massa e espessura de 1,9 mm. Na segunda configuração, as faces do painel foram fabricadas com tecido de fibra de vidro e resina poliéster, com 54% de teor de vidro em massa e espessura de 1,2 mm. Realizou-se o cálculo das propriedades mecânicas de cada compósito no programa MECH-Gcomp. As propriedades do núcleo foram retiradas, inicialmente, da literatura. Então, foi possível realizar a avaliação dos painéis pelo método dos elementos finitos utilizando elementos sólidos, comparando o comportamento dos dois tipos de painéis em relação aos carregamentos de compressão de núcleo, de compressão longitudinal e de flexão. Foram realizados ensaios nas faces isoladas e também nos painéis sanduíche completos. Para as faces, os ensaios foram de teor mássico de fibra de vidro, tração, compressão e cisalhamento Iosipescu, conforme as normas ASTM D5630, D3039/D3039M, D6641/D6641M e D7078/D7078M, respectivamente. Já para os painéis sanduíche, foram realizados os ensaios de compressão de núcleo, compressão longitudinal (edgewise) e cisalhamento do núcleo utilizando flexão, conforme as normas ASTM C365/C365M, C364/C364M e C393/C393M, respectivamente. Após os ensaios, foram calibrados os modelos do MEF, permitindo que os mesmos possam calcular outras configurações similares de painel sanduíche. Foi utilizado o programa Autodesk Simulation Composite Design para realizar a validação do ensaio de cisalhamento do núcleo. Concluiu-se que a análise de elementos finitos foi confiável em representar de forma realista o comportamento dos painéis sanduíche e a redução na espessura das faces do painel pode ser compensada com o aumento da sua resistência mecânica e rigidez por meio do aumento no teor mássico de reforço e trabalhando com a orientação do mesmo.Sandwich panels are widely used in a variety of engineering applications and the study of their properties is fundamental for the expansion of their use. In this work, we studied sandwich panels with polyurethane core and fiberglass faces manufactured by the continuous lamination process. In the first configuration, the panel faces were made of fiberglass and polyester resin, with 39% glass content by mass and 1.9 mm thickness. In the second configuration, the panel faces were fabricated from fiberglass fabric and polyester resin, with 54% glass content by mass and 1.2 mm thickness. The mechanical properties of each composite were calculated in the MECH-Gcomp software. The properties of the core were initially taken from the literature. Then, it was possible to evaluate the panels by the finite element method using solid elements, comparing the behavior of the two types of panels in relation to the core compression loads, edgewise compression and bending. Tests were performed on the faces and also on the complete sandwich panels. For the faces, the tests were fiberglass mass content, tensile, compression and Iosipescu shear, according to ASTM D5630, D3039/D3039M, D6641/D6641M and D7078/D7078M, respectively. For sandwich panels, core compression, edgewise compression and core shear using bending tests were performed according to ASTM C365/C365M, C364/C364M and C393/C393M, respectively. After the tests, the FEM models were calibrated, allowing them to calculate other similar sandwich panel configurations. It was used Autodesk Simulation Composite Design software to validate the core shear test. It was concluded that the analysis of finite elements was reliable in realistically representing the behavior of the sandwich panels and the reduction in the thickness of the panel faces can be compensated with the increase of its mechanical resistance and stiffness by increasing the mass content of reinforcement and working with the orientation of the same.
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Melo, Alan Jones Lira de. "Avalia??o da estrutura de tecidos t?cnicos como elemento refor?ante em comp?sitos polim?ricos sistema poli?ster isoft?lico." Universidade Federal do Rio Grande do Norte, 2013. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15705.
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Previous issue date: 2013-07-23Materials known as technical textiles can be defined as structures designed and developed to meet specific functional requirements of various industry sectors, which is the case in automotive and aerospace industries, and other specific applications. Therefore, the purpose of this work presents the development and manufacture of polymer composite with isophthalic polyester resin. The reinforcement of the composite structure is a technical textile fabric made from high performance fibers, aramid (Kevlar 49) and glass fiber E. The fabrics are manufactured by the same method, with the aim of improving the tensile strength of the resulting polymer composite material. The fabrics, we developed some low grammage technical textile structures in laboratory scale and differentiated-composition type aramid (100%), hybrid 1 aramid fiber / glass (65/35%) and hybrid 2 aramid fiber / glass (85/15% ) for use as a reinforcing element in composite materials with unsaturated isophthalic polyester matrix. The polymer composites produced were tested in uniaxial tensile fracture surface and it?s evaluated by SEM. The purpose of this work characterize the performance of polymer composites prepared, identifying changes and based on resistance to strain corresponding to the mechanical behavior. The objectives are to verify the capability of using this reinforcement structure, along with the use of high performance fibers and resin in terms of workability and mechanical strength; verify the adherence of the fiber to the matrix and the fracture surface by electron microscopy scanning and determination of tensile strength by tensile test. The results indicate that, in a comparative study to the response of uniaxial tensile test for tensile strength of the composites and the efficiency of the low percentage of reinforcement element, being a technical textile fabric structure that features characteristic of lightness and low weight added in polymer composites
Os materiais denominados de tecidos t?cnicos podem ser definidos como estruturas projetadas e desenvolvidas com a fun??o de atender a requisitos funcionais espec?ficos de diversos setores da ind?stria com aplica??es espec?ficas. Nesse sentido, este trabalho apresenta o desenvolvimento e a fabrica??o de comp?sito polim?rico com resina poli?ster isoft?lico. O refor?o do comp?sito ? uma estrutura de tecido t?xtil t?cnico confeccionado com fibras de alto desempenho de aramida (Kevlar 49) e fibra de vidro E. Os tecidos s?o fabricados pelo mesmo m?todo, com o objetivo do aprimorar a resist?ncia a tra??o do material comp?sito polim?rico resultante. Os tecidos, foram desenvolvidos em escala laboratorial com baixa gramatura e composi??o diferenciada de aramida (100%), h?brido 1 fibra de aramida/vidro (65/35%) e h?brido 2 fibra de aramida/vidro (85/15%) para utiliza??o como elemento refor?ante em comp?sitos com matriz de poli?ster insaturada isoft?lico. Os comp?sitos polim?ricos produzidos foram ensaiados em tra??o uniaxial e sua superf?cie de fratura avaliada por MEV. A proposta do trabalho ? caracterizar o desempenho dos comp?sitos polim?ricos elaborados, identificando as altera??es e baseando-se na resist?ncia ao ensaio de tra??o correspondente a comportamento mec?nico. Os objetivos s?o verificar a potencialidade da utiliza??o desta estrutura de refor?o, juntamente com a utiliza??o das fibras de alto desempenho e a resina, em termos de trabalhabilidade e resist?ncia mec?nica; verificar a ader?ncia da fibra ? matriz e a superf?cie de fratura atrav?s de microscopia eletr?nica de varredura e determina??o de resist?ncia ? ruptura por ensaio de tra??o. Os resultados indicam que, em um estudo comparativo para a resposta dos ensaios mec?nicos de tra??o uniaxial h? resist?ncia ? ruptura dos comp?sitos e a efici?ncia da baixa porcentagem do elemento de refor?o, sendo uma estrutura de tecido t?xtil t?cnico que apresenta caracter?stica de leveza e baixa gramatura adicionada nos comp?sitos polim?ricos
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Saunders, R. A. "Compression and microstructure of glass fibre fabrics in the processing of polymer composites." Thesis, University of Surrey, 1997. http://epubs.surrey.ac.uk/842832/.
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The compression of typical glass fibre woven fabrics, namely plain, twill, satin, and noncrimped stitch-bonded fabric, was studied experimentally by performing a series of mechanical tests on dry and resin impregnated assemblies of fabrics. This was followed by microstructural studies of corresponding laminates cured under different degrees of compression. The experiments included investigations on the effects of applied pressure, speed of compression, fabric orientation, number of plies and different resin systems on fibre volume fraction,Vf, of the compressed assembly. It was found that the compression of dry fabrics followed a power-law relationship between pressure and Vf where the power law index, b, was determined to be approximately equal to 10.3, 9.8 and 9.1 for assemblies consisting of plain, twill and 5 harness satin weaves, respectively. A mathematical analysis was performed for the viscoelastic compression of resin impregnated assemblies of fabrics and a model was developed incorporating the deformation of the fibre network and resin flow through the reinforcement. A methodology was devised for the geometrical representation of plain weaves in the microstructural analysis of cured laminates. The microstructural studies then provided data for the area and geometrical parameters of the yam cross-section; the mean amplitude, wavelength and phase angle of the yarn waveform and the distance between plies at different compression pressures. Cross-sections of laminates with each of the considered fabrics were compared in terms of fibre area fractions, porosity and void content, for the different compression pressures. The aim for the microstructural analysis was to elucidate the mechanism of compression and to follow the development of fibre and pore structure under different degrees of compression. It was concluded that the compression of resin impregnated woven fabrics could be considered as a combination of four modes of deformation; (a) the elimination of a resin rich interlayer between adjacent layers of fabric; (b) the nesting of layers of fabric by slipping while under compression; (c) the deformation of the yam waveform which results in the reduction of thickness of individual plies and (d) the compression and deformation of the cross-sections of individual yarns.
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Silva, Bianca Catarina Guimarães da. "Fabrico de scaffolds porosos de vidro bioativo para regeneração óssea." Master's thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/16970.
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Mestrado em Materiais e Dispositivos BiomédicosA Engenharia de Tecidos é um domínio multidisciplinar com o objetivo de desenvolver substitutos biológicos para a regeneração, reparação ou restauração de funções de órgãos ou tecidos. Os scaffolds são materiais porosos tridimensionais que servem de matrizes para a adesão e proliferação das células, bem como para a produção de matriz extracelular, idealmente, à taxa a que decorre a degradação do scaffold. A conceção de estruturas adequadas para suportar o restauro ou melhorar a função de tecidos é um dos maiores desafios da Engenharia de Tecidos. O presente estudo teve como objetivo a produção e caracterização de scaffolds de vidro bioativo, de composição molar 38.49% SiO2 – 36.07% CaO – 19.24% MgO – 5.61% P2O5 – 0.59% CaF2, utilizando um processo de fabrico aditivo, que teve por base a construção de objetos 3-D a partir de um modelo de desenho assistido por computador, utilizando a estratégia de fabrico camada a camada. Utilizou-se para tal um equipamento de deposição robótica (3D Inks, LLC, modelo EBRD-A32_-0_). O trabalho desenvolvido incluiu diferentes etapas, tais como: (i) preparação e caracterização reológica de suspensões concentradas à base de vidro bioativo em meio aquoso, estudo do dispersante mais adequado e da respetiva quantidade para a obtenção de uma suspensão suficientemente fluida e ao mesmo tempo concentrada em sólidos para minimizar as variações dimensionais ao longo do processo; (ii) estudo dos efeitos dos aditivos de processamento e das suas quantidades necessárias para transformarem a suspensão fluida numa pasta extrudível, com rigidez suficiente para manter a forma do filamento cilíndrico após a extrusão, e a caracterização reológica da tinta; (iii) fabrico dos scaffolds através da técnica de robocasting; e por fim (iv) a caracterização das estruturas obtidas quanto às propriedades morfológicas e mecânicas. Os resultados obtidos mostraram que o vidro bioativo permite a preparação de pastas com características reológicas adequadas para a deposição camada a camada por robocasting. Os scaffolds obtidos apresentam geometrias bem definidas e distribuições de poros uniformes, confirmando a adequabilidade da técnica para o fabrico de scaffolds porosos de vidro bioativo com estruturas apropriadas para aplicações nas áreas da Engenharia de Tecidos e da Medicina Regenerativa.
Tissue Engineering is a multidisciplinary field aiming at developing biological substitutes for regeneration and repair or restore functions of organs or tissues. The three-dimensional porous scaffolds serve as supports for cell attachment and proliferation as well as the production of extracellular matrix, ideally, at the same rate as scaffold degrades. The design of structures suitable to support the restoration or improve tissue function is one of the biggest challenges of Tissue Engineering. This study aimed to the production and characterization of bioactive glass scaffolds, with molar composition of 38.49% SiO2 – 36.07% CaO – 19.24% MgO – 5.61% P2O5 – 0.59% CaF2, using an additive manufacturing process, which was based on the construction of 3-D objects from a computer-assisted design model, using the manufacturing strategy of layer by layer. For such a robocasting machine (3D Inks, LLC, modelo EBRD-A32_-0_) was used. The work included different steps such as: (i) preparation and rheological characterization concentrated aqueous suspensions of bioactive glass, and study of the most effective dispersing agents and their respective amounts for obtaining a sufficiently fluid while high solids loaded suspension to minimize dimensional variations throughout the process; (ii) studying the effects of processing additives and their required amounts for transforming the fluid suspension into an extrudable paste with enough stiffness for the cylindrical filaments to maintain the shape after extrusion, and rheological characterization of the inks; (iii) manufacturing of the scaffolds through the robocasting technique; (iv) characterization of the 3-D structures obtained for their morphological and mechanical properties. The results obtained demonstrated that the bioactive glass allows the preparation of inks with appropriate rheological characteristics to be deposited layer by layer by robocasting. The resulting scaffolds exhibit well-defined geometries and uniform pore size distributions, confirming its suitability for the fabrication of porous bioactive glass scaffolds with appropriate structures for being applied in the areas of Tissue Engineering and Regenerative Medicine
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Coignac, Bruno. "Lois d'écoulement et endommagement en chargement statique ou cyclique d'un multimatériau "composite (verre/epoxy)-cuivre" : Etude expérimentale et modelisation." Besançon, 1988. http://www.theses.fr/1988BESA2024.
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Florimond, Charlotte. "Contributions à la modélisation mécanique du comportement de mèches de renforts tissés à l'aide d'un schéma éléments finis implicite." Thesis, Lyon, INSA, 2013. http://www.theses.fr/2013ISAL0136/document.
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La simulation du procédé de fabrication de renforts fibreux secs est un enjeu majeur pour l’étude de l’élaboration de matériaux composites, dont l’utilisation dans les industries de pointe s’intensifie rapidement. Ainsi, l’influence du métier à tisser sur la qualité des renforts est primordiale dans la caractérisation de leurs propriétés mécaniques. Une campagne d’essais expérimentaux est tout d’abord réalisée, de manière à identifier les phénomènes physiques mis en jeu. Les différents modes de déformation de la mèche sont ainsi étudiés : élongation, compaction, cisaillement et distorsion. Est étudié également le comportement en flexion et en frottement, afin de mieux appréhender l’effet du procédé de tissage sur les mèches. Deux types de lois de comportement élastiques sont envisagés : une loi hypoélastique et une loi hyperélastique. Sont développées les propriétés de chacune d’entre elles, ainsi que les grandeurs caractéristiques nécessaires à leur implémentation dans le logiciel commercial ABAQUS/Standard. Les algorithmes de deux subroutines sont présentés, correspondant à l’une ou l’autre de ces lois. Le choix est fait de modéliser le comportement mécanique de la mèche à l’aide d’une loi hyperélastique isotrope transverse de type St-Venant, par l’intermédiaire de la subroutine ABAQUS/Standard UANISOHYPER_INV. Enfin, une identification des paramètres matériau à l’aide d’une méthode inverse est proposée. Sont comparés les résultats obtenus par simulation avec les résultats expérimentaux. La loi de comportement alors déterminée permet de mettre en place des simulations de procédé de tissageSimulating the manufacturing process of woven preforms is a major stack for understanding the development of composite materials, used in high performance industries. The effect of the weaving loom on the preforms is very important to caracterize their mechanicals properties. Experimental tests are realised to identify the physical phenomenon. Different deformation modes are studied : elongation, compaction, shear and distortion. The bending and friction behavior are also important to understand the effect of weaving process. Two constitutive laws are considered : a hypoelastic law and a hyperelastic law. An analyse of their properties is presented, and their implementation in a commercial software, ABAQUS/Standard, is detailed. In this purpose, two subroutines can be used. The modelisation of the mechanical behavior of the tows is finally realised with a transversely isotropic hyperelastic St-Venant model, with the subroutine ABAQUS/Standard UANISOHYPER_INV. To conclude, an identification method is presented and the simulated results are compared to experimental tests. The obtained consitutive behavior is finally used to simulate the weaving process
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Gurer, Goksu. "Design And Characterization Of Electromagnetic Wave Absorbing Structural Compsites." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612359/index.pdf.
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Electromagnetic interference (EMI) is one of the most common problems encountered in microwave applications. Interaction of electromagnetic (EM) waves from different sources may result in device malfunction due to misinterpretation of the transferred data or information loss. On the other hand, development of materials with reduced radar detectability is desired in defense applications. Considering the limitations in weight and thickness, development of lightweight structural materials with enhanced electromagnetic absorption potential is needed. In this study, development and characterization of glass fiber-reinforced polymer (GFRP) composite materials to be used in EM wave absorbing or EMI shielding applications was aimed. Incorporation of electromagnetic wave absorption characteristic has been achieved by the application of conductive thin film on fiber glass woven fabric reinforcement layers. Characterization of EM wave absorption potential was conducted using &ldquofree-space method&rdquo
in 18 &ndash
27 GHz frequency range. Single and multilayered combinations of surface-modified fiber glass woven fabrics were characterized in terms of their EM wave interaction properties and design principles for efficient broadband EM wave absorbing multilayered GFRP composite material have been presented. A computer aided computation method has also developed in order to predict EM wave transmission, reflection, and hence absorption characteristics of multilayered structures from single layer properties. Estimated results were verified compared to free-space measurement results. In the current study, up to 85% electromagnetic wave absorption has been obtained within 18-27 GHz frequency range (K band). Enhancement of EM wave absorption potential of multilayer structure has also been demonstrated by computer aided computation.
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Ünal, Ahmet Akın [Verfasser], Heinrich [Akademischer Betreuer] Graener, Jamal [Akademischer Betreuer] Berakdar, and Fabrice [Akademischer Betreuer] Vallée. "Time-resolved investigations on ultrafast shape modification dynamics of silver nanoparticles embedded in glass / Ahmet Akın Ünal. Betreuer: Heinrich Graener ; Jamal Berakdar ; Fabrice Vallée." Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2009. http://d-nb.info/1024874346/34.
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Vilfayeau, Jérôme. "Modélisation numérique du procédé de tissage des renforts fibreux pour matériaux composites." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0026/document.
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L'industrie aéronautique doit faire face aux nouvelles exigences environnementales, tout particulièrement concernant la réduction de la consommation des énergies fossiles. L'utilisation de matériaux composites plus léger permet de répondre en partie à cette attente. Pour limiter les coûts lors de la fabrication et du développement des composites à renforts tissés 3D, il est nécessaire d'utiliser des outils de simulation performants. En particulier, les outils existants, qui discrétisent à une échelle mésoscopique l'architecture des tissus 3D, ne tiennent pas compte de l'influence du procédé de fabrication sur la constitution de la structure textile. Si des outils numériques dédiés à la modélisation du procédé de tressage et de tricotage sont disponibles, il n'en est rien concernant le tissage. Cette étude avait donc pour but de s'intéresser plus particulièrement à la simulation du prodécé de tissage pour pouvoir obtenir une structure de tissu sèche déformée numériquement. La production de différentes architectures de tissu en verre E dans notre laboratoire nous a permis d'observer les différents éléments en contact avec le fil ou le tissu sur la machine à tisser, par le biais de l'utilisation d'une caméra rapide par exemple. Le développement d'un modèle numérique par éléments finis reproduisant le procédé de tissage a été réalisé. Une loi de comportement isotrope transverse fut utilisée pour modéliser les fils de verre. Des premières simulations numériques encourageantes pour la fabrication d'un tissu d'armure toile et d'un tissu d'armure croisé 2-2 sont présentées et comparées avec les tissus réels produits correspondantsThe aeronautical industry faces new challenges regarding the reduction of fossil fuel consumption. One way to address this issue is to use lighter composite materials. The ability to predict the geometry and the mechanical properties of the unit cell is necessary in order to develop 3D reinforcements in composite materials for these aeronautical applications. There is a difficulty to get realistic geometries for these unit cells due to the complexity of their architecture. Currently, existing tools which model 3D fabrics at a meso scale don't take into account manufacturing process influence on the shape modification of the textile structure. There is already some numerical tools that can model the braiding or knitting process, but none have been developed for weaving so far. Consequently, this study deals with the numerical simulation of the weaving process to obtain a deformed dry fabric structure. During the weaving process of E-glass fabrics, achieved in our laboratory, it has been observed that large deformations led to the modification of transverse section of meshes, or local density changes, that can modify the fabrics mechanical resistance. For this reason, a numerical tool of the weaving process, based on finite element modelling, has been developped to predict these major deformations and their influences on the final textile structure. The correlation between numerical results and fabrics produced with glass fibres has been achieved for plain weave and 2-2 twill
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Lima, Jos? Henrique Batista. "Desenvolvimento de t?xteis t?cnicos para refor?o de comp?sitos polim?ricos." Universidade Federal do Rio Grande do Norte, 2012. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15684.
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Previous issue date: 2012-05-02Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico
Materials denominated technical textiles can be defined as structures designed and developed with function to fulfill specific functional requirements of various industrial sectors as are the cases of the automotive and aerospace industries. In this aspect the technical textiles are distinguished from conventional textile materials, in which the aesthetic and of comfort needs are of primordial importance. Based on these considerations, the subject of this dissertation was established having as its main focus the study of development of textile structures from aramid and glass fibers and acting in order to develop the manufacture of composite materials that combine properties of two different structures, manufactured in an identical operation, where each structure contributes to improving the properties of the resulting composite material. Therefore were created in laboratory scale, textile structures with low weight and different composition: aramid (100%), glass (100%) and aramid /glass (65/35%), in order to use them as a reinforcing element in composite materials with polyester matrix. These composites were tested in tension and its fracture surface, evaluated by MEV. Based on the analysis of mechanical properties of the developed composites, the efficiency of the structures prepared as reinforcing element were testified by reason of that the resistance values of the composites are far superior to the polyester matrix. It was also observed that hybridization in tissue structure was efficient, since the best results obtained were for hybrid composites, where strength to the rupture was similar to the steel 1020, reaching values on the order of 340 MPa
Os materiais denominados t?xteis t?cnicos podem ser definidos como estruturas projetadas e desenvolvidas com a fun??o de atender a requisitos funcionais espec?ficos de diversos setores da ind?stria, caso da ind?stria automotiva e aeroespacial. Nesse aspecto, distinguem-se dos materiais t?xteis convencionais, nos quais as necessidades est?ticas e de conforto t?m import?ncia primordial. Com base nessas considera??es, o tema dessa disserta??o foi estabelecido tendo como enfoque principal o estudo do desenvolvimento de estruturas t?xteis a partir de fibras de aramida e de vidro, atuando no sentido de elaborar a fabrica??o de materiais comp?sitos que combinem propriedades de duas estruturas diferentes, fabricadas em uma mesma opera??o, onde cada estrutura contribui para melhoria das propriedades do material comp?sito resultante. Para tanto foram desenvolvidas em escala laboratorial estruturas t?xteis de baixa gramatura e composi??o diferenciada de aramida (100%), vidro (100%) e aramida/vidro (65/35%) para utiliza??o como elemento refor?ante em comp?sitos com matriz de poli?ster. Os comp?sitos produzidos foram ensaiados em tra??o e sua superf?cie de fratura avaliada por MEV. Com base nas analises das propriedades mec?nicas dos comp?sitos desenvolvidos, observou-se a efici?ncia das estruturas ou elaboradas como elemento refor?ante tendo em vista que os valores de resist?ncia dos comp?sitos foram muito superiores ? matriz de poli?ster. Tamb?m foi observado que a hibridiza??o na estrutura dos tecidos foi eficiente, uma vez que os melhores resultados obtidos foram para os comp?sitos h?bridos, onde a resist?ncia na ruptura foi semelhante ? do a?o 1020, atingindo valores na ordem de 340 MPa
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Finau, Emily. "Transparency and learning spaces." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39593.
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This thesis explores the various meanings and implications of transparency in architecture and in learning environments in particular. Architectural transparency, achieved through choice of materials and principles of formal composition, creates a diversity of relationships and can facilitate visual, conceptual, and functional clarity as well as offering simultaneous perception of different spaces. It offers a range of phenomenological qualities and so provides an opportunity to explore and complicate such dichotomies as translucency and opacity, openness and closure, and public space and private space.
While celebrated throughout modern and contemporary architecture, transparency raises issues of privacy and safety even as it breaks down hierarchies and social boundaries. The research-based design of transparency in a school building necessitates careful planning to achieve a balance between the access to views, natural light, fresh air, and social interaction that transparency may bring and the continuing obligation to provide a safe, secure environment for schoolchildren.
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Pan, Yu-Hao, and 潘毓豪. "Low Velocity Impact Damage of Various Glass Fabric Laminates." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/84497777369271945938.
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博士逢甲大學
紡織工程所
91
Four E-glass fabrics, non-crimp fabric, woven fabric, nonwoven mat, and integrated hollow pile fabric were selected as reinforcements for composite laminates. Three laminates, monolithic, sandwich, and hybrid structures with various numbers of layers, were formed. Low-velocity impact tests were conducted using a guided drop-weight test rig in ascending energy up to 24 J/layer nominal impact energy. A computer digitally recorded the impact load-time and energy-time histories of the laminate. Metallographic microscopy was used to observe the damage characteristics of the perpendicular cross section of the impacted laminates after a micropowder polishing treatment. The results showed that the impact energy absorption and the damage characteristics were strongly dependent on the construction of the laminate. From the observation of the metallographic fractographics, it was found that fiber breakage had occurred prior to the major damage. When the impact energy increased past the threshold energy of the major damage, matrix cracking, delamination, and fiber breakage were observed at the back surface, below a nearly undamaged zone, which attributed to bending stresses. Significant delamination was found in both of the sandwich laminate and the hybrid laminate, which could explain the increase in impact energy absorption. The damage thresholds can be identified from impact load-time and energy-time curves, and they were affected by the construction and thickness of the laminates. For the monolithic laminates, the damage force of Hertzian failure, major damage, and penetrating energy were identified. The load-time curve of the MP laminate showed a double hump response. The damage force of core buckling, major damage force of the top skin, major damage force to the bottom skin, and densification point energy, penetrating energy of the top skin, and penetrating energy of the MP laminate all were identified. The inlaid nonwoven mat induced a serious delamination response on the load-time curve of nonwoven mat inlaid multiaxial warp knit fabric laminate. The load-time curve of multilayer nonwoven mats inlaid multiaxial warp knit fabric laminate showed a corresponding multiple damage force peak response. The inlaid nonwoven mat played an important role in impact behavior and damage characteristics. The location of the inlaid nonwoven mat is another important parameter for the impact energy absorption of a laminate.
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HUANG, XU-YE, and 黃旭曄. "Fabrication of (MAT/0^^/90^^) WIWK glass fabric and study on the mechanical properties of these fabric composites." Thesis, 1989. http://ndltd.ncl.edu.tw/handle/03874588160123441213.
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碩士逢甲大學
紡織工程研究所
77
W I W K 織物（Weft Inserted Warp Knitted Fabric）比傳統的雙軸梭織物（Bixa l Woven Fabric）更能夠充分表現紗對布的強力傳遞效應，且在製成複合材料以後， 有較高的抗張和 曲等機械性質，但是這種織物也有其缺點： 1.經緯紗彼此以90度角正交疊成但不交織，故其尺寸安定性和斜向（bias，相對經緯 紗45度方向）的機械性質都很差。 2.其複合材料在厚度方向性質和層間剪強力差，限制了其使用壽命。為了改進以上缺 點，除了加入玻璃纖維蓆，來使其機械性質更趨近於擬等方向性，並在z（厚度）方 向織入纖維束，使其達高級複合材料領域。 本文旨在改裝設計傳統CROCHET 經編機，以織造無交織點（MAT/0/90）緯向夾入經編 織物，並作成複合材料與（MAT/WIWK）和（MAT/WOVEN）複合材料作各種機械性質比 較，同時以破壞力學中的ModeI模型來尋求其破壞韌性值，並以光學顯微鏡觀察其破 壞現象。 綜合本文實驗結果如下: 1.CROCHET經編機經加裝設計兩組MAT喂入皮輥及兩套傳動齒輪後可成功地織造（MAT/ 0/90）立體織物。 2.沒有交織點存在的（MAT/0/90）和（MAT/WIWK）織物補強材料其抗張性質皆優於有 交織點的（MAT/WOVEN）織物補強材料。 3.（MAT/0/90）和（MAT/WIWK）織物補強材料其彎曲強力高於 （MAT/WOVEN）但彎曲 係數卻相反。 4.（MAT/0/90）織物複合材料由於有z方向聚酯纖維，所以其層問剪強力優於（MAT/W OVEN）和（MAT/WIWK）織物複合材料。 5.（MAT/WOVEN）物複合材料其抗衝擊能量吸收優於（MAT/0/90）和（MAT/WOVEN）織 物複合材料。 6.在以Mode I法所得破壞韌性質Gic中，（MAT/0/90）最高，其次為（MAT/WOVEN）， 而（MAT/WIWK）最低。
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Wang, Chen-ni, and 王珍妮. "Evaluating the Weatherability and the nature of Polytetrafluoroethylene coated glass fabric." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/mxem59.
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碩士國立臺北科技大學
有機高分子研究所
102
The basic properties of the complex material requirements for the weight, density, breaking strength, tear strength, abrasion resistance, Weatherability etc., the study is a plain weave glass fiber coated with a composite made of polytetrafluoroethylene material through weathering resistance, mechanical testing ... etc. assesses the feasibility of composite materials used. The weatherability evaluations of membranes conduct an investigation into the solar radiation effect of membrane materials by accelerated weathering test and outdoor exposure test. The period of outdoor exposure for membrane under specified load. It is the accelerated weathering test, which expose membrane to reach accumulated irradiance energy in a design condition. This study is evalmating the breaking strength and observing the appearance complex materials accelerated weathering exposure processes
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Chen, Chun-kai, and 陳俊楷. "An Application of Drum-Buffer-Rope for Glass Fabric Cloths Production Improvement." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/48880341327126555786.
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碩士逢甲大學
工業工程與系統管理學研究所
95
Communication, Computer, and Consumer Electronics (3C) become the whole world to grow the fastest industry. However electronics industries are facing the impact of meager profit and the globalization fierce competition. In order to strive for the customer order form except outside the high quality, high-tech and the low cost unceasing pushes the favorable balance of trade imagination the delivery date to pledge. Therefore reduction supply chain operation lead time acts the extremely important role strategy of management in the enterprise management. This paper applied eM-Plant software to establish the virtual scenery of glass fiber cloths production line. We first go in a sequential production module and then established a near true lot production line. According to the scheduling principal of Drum-Buffer-Rope (DBR) in the Theory of Constraints (TOC), we set up the buffer in the front of restricted resources to reduce the constraints and simulate various combinations of orders through the virtual production line. We also improve the bottleneck resource of the manufacturing process and simulate various sceneries to enable the maximum production capability.
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Yeu-Li, Lee, and 李宇立. "Nano-silica Toughening Epoxy Resin and Effect on the Glass Fabric Reinforced Composites." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/31871048416110264397.
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碩士逢甲大學
纖維與複合材料學系
102
An optimized synthesis of nanometer silica particles by sol-gel method take advantage of Tetraethoxysilane (TEOS). Preparation of nano-silica / epoxy mixed solution thorugh ultrasonication and mechanical agitation. Using differential scanning calorimetry (DSC) to explore the effect of different nano-silica added proportions on glass transition temperature (Tg) of resin system. Glass fabric/nano-silica/epoxy composite laminates made by hand lay-up and hot pressing method. The purpose of this study is to evaluate the reinforced role of nano-silica on the mechanical properties and the interlaminar fracture behaviour of fibre reinforced toughened epoxy. Flexural test, short-beam test and fracture toughness test (Double Cantilever Beam test) were performed to evaluate mechanical performance. Based on the experimental results showed that glass transition temperature (Tg) of resin system does not significantly influenced by adding with different amounts of nano-silica. Flexural strength and flexural modulus increased with increasing of nano-silica added amounts. The flexural strength and flexural modulus of the composites enhance 9.98% and 13.74%, respectively, with silica particles added 8 wt.% loading. Compared to the neat epoxy, the interlaminar shear strength of silica composites increased of 16.31% for 12 wt.% silica loading. The mode I fracture toughness of laminates also exhibt increased with increasing of nano-silica weight fraction. The GIC value enhance 55.7% with adding 12 wt.% nano-silica weight fraction. According to observ the photos of SEM after DCB tested specimen showed that including crack pinning, crack deflection, particle pull-up and microcracks etc. failure modes on the fracture surface. It demonstrates the composite materials could absorb more energy and causes the GIC increased when added nano-silica into epoxy system.
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林立凱. "Fracture Toughness of Glass Fabric Reinforced 2-Ethyl Hexyl Acrylate Toughening Epoxy Laminates." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/49785141368407866956.
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Gu, Jun-Ji, and 古均吉. "Studying PTFE-Glass Fabric Composite Materials for High Temperature Exhaust Gas Filtration Bag." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/8sj7jf.
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碩士國立臺北科技大學
化學工程與生物科技系化學工程碩士班（碩士在職專班）
105
The PTFE-Glass Fabric Composite produced in this study can use to remove PM2.5 in high temperature emission gas in industry. The experiment is divided into two parts; the first one is to combine expanded microporous Polytetrafluoroethylene (ePTFE) film with PTFE-dipped glass fabric in a single-stage wet process that can greatly increase the production efficiency in current industry. Two types of glass fabric dip with different solid contents of PTFE suspension. The PTFE-dipped glass fabric then affix with ePTFE film on its one side under suitable operation conditions to obtain PTFE-glass fabric composite with appropriate bonding strength, pore size distribution and air permeability for filtration bag. The filtration bag with 15% PTFE solid content produced by the single-stage wet process has 700g of bonding strength, lower than 1µm of pore diameter, and 2 cm³/cm²/s of air permeability. These properties achieve the commercial product standard. The second part in this study is to prepare microporous thin film, instead of ePTFE, and coated on the surface of PTFE-glass fabric. In this part, an emulsion solution of PTFE with micro-sized micelles by using appropriate plasticizer was prepared first, and then coated on the above-mentioned PTFE-glass fabric by dip process. Finally, a thin film with microporous formed on the surface of the PTFE-glass fabric after drying and sintering. The microporous film contained about 2.5µm of pore diameter, but the air permeability is not comparable to the PTFE-glass fiber composite made of ePTFE film. This problem can be solved by adjusting the coating process and the weaving patterns of fabric.
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Lu, Ying-Yin, and 盧映吟. "Research in The Totems of Payuan Glass Beads Application toModern Fabric Pattern Design." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/jpx767.
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碩士國立屏東科技大學
時尚設計與管理系所
105
Abstract Student ID：M10376016 Title of thesis：Research in The Totems of Payuan Glass Beads Application to Modern Fabric Pattern Design Total pages：146 Name of Institute：Department of Fashion Design and Management,National Pingtung University of Science and Technology Graduate date：January,2017 Degree Conferred：Master Name of student：Ying-Yin Lu Adviser：Dr.Sang-Song Lai The contents of abstract in this thesis： In view of the advent of "globalization", Taiwan's cultural creativity has been gaining momentum and enhancing the aestheticization of everyday life. As the rise of cultural and creative industries, with the cultural story of the goods, more likely to get consumers love. Therefore, in this study, we try to draw the five patterns of eye pattern, warrior pattern, teardrop pattern, crescent pattern and daylight pattern as the creative elements, which are the elements of the aboriginal culture elements of Taiwan - Paiwan ancient glazed beads pattern. 20 kinds of popular fabrics, and the basis of perceptual engineering, image analysis, to explore the different backgrounds of the image perception and preferences; understanding of consumers for the Paiwan cultural transformation of the new image perception, expect the future to provide fabrics for the designer Creation of reference, but also to Paiwan culture have more application-oriented. In the research method, 385 questionnaires were collected by means of semantic difference analysis, and four questionnaires were designed for students of design department, aboriginal industrial workers, apparel industry and general consumers. The results showed that: (1) The image cognition of influencing factors of the popular cloths mainly consisted of heart perception factors, visual communication factors and visual perception factors. (2) to distinguish between the image of gender differences in perception: the image of men for the fabric pattern biased in favor of three-dimensional, concrete, while women are more biased in favor of the dream of the real and abstract; to distinguish between ethnic image differences in perception: Aborigines for Paiwan Image perception, tend to eye-catching, eye-catching, on the contrary, non-aboriginal status are more biased in favor of fantasy and gorgeous. (3) consumers tend to eye-catching, eye-catching, fantasy, gorgeous, three-dimensional, fashion and other images of popular fabrics. Key words: Paiwan people, glass beads, cloth pattern, image analysis
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HSU, YI-HAN, and 徐繹函. "Characterization of the Mechanical Properties of Low Temperature TPU/Glass Fabric Composite Materials." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/2p8jkm.
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碩士國立臺北科技大學
分子科學與工程系有機高分子碩士班
106
In this study, commercial thermoplastic elastomers were selected as the main components, and the physical properties of commercial thermoplastic elastomers were increased by the use of self-synthesis of novel chemical additives. Thermoplastic elastomers are arrayed main soft segment and a hard segment, if it is possible to effectively increase the hard segment content in the polymer system, the physical properties will respect to increase. This paper is mainly used commercial low-temperature thermoplastic polyurethane system, by adding hard segments (diphenylmethane diisocyanate (MDI) and 1,4-butanediol (BDO)).However, the difference proportions and concentrations control of the hard segments will invent a commercially-available thermoplastic polyurethanes. In addition, the modified thermoplastic polyurethane and glass fiber fabrics are combined to create a new type of low-temperature thermal plastic glass fiber composite fabric material by adjusting different coating processes and controlling the solid content of the coating. To the experimental testing, the Fourier infrared spectrometer was used as the functional group identification of polyurethane; in terms of thermal properties,by the use of TGA and DSC to observe polyurethane pyrolysis temperature (TD), melting point (TM) and crystallization temperature (TC).And in terms of the tensile properties testing, hardness and other properties. This result shows that Youngs modulus will increase about 20% with 1wt% and 3wt% hard segment (MDI: BDO) content. On the contrast, with the excess of hard segments content till 15%, the mechanical properties of PU will decrease without any improvements.
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SUN, KO-CHUAN, and 孫克傳. "Competition Strategies and Industrial Analysis of Electronic-Grade Glass Fabric Industry in Taiwan." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/30197517792339194899.
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碩士國立臺灣大學
國際企業管理組
95
Taiwan has been to the corner on the Mother Board market. China will over Japan become the worldwide biggest producer of PCB. The Electronic Grade Glass Fabric is the indispensable material for PCB and will be affected by the rise and/or decline of PCB industry. The demand declined since year 2000’s sluggish market. In addition, the over expansion worsen the competition environment. The electronic industries experienced the severest test. Continuously price war does not squeeze the profitability only but also twist the ecology of supply chain. And, speed up the production base relocation. In year 2001, E-grade Glass Fabric over supplied for the Global market of electronic products declined drastically. It lashed the industries in Taiwan. Moreover, we shall anxious about the changes of investment environmental in Taiwan, companies move to China are steadily on the increase, etc. We have to face the lower price E-grade Glass Fabric export from China to Taiwan after their local fabric producer developed fast and enter into the WTO. Based on Porter’s framework of national competitive advantages and industry structure, this thesis conducted a study to the following steps by Taiwanese E-grade Glass Fabric manufacturers in such an oligopoly and matured industry environment. The five competitors in Taiwan E-Grade Glass Fabric industry, some of them are based on productivity strength, some are based on cost strength, and some are based on technical strength, to hold their market shares. They should consider their own weakness and strength to plan their product position and strategy to avoid blind expansion and price war. For the long-term, the industry shall towards high-value market, high-end products development, vertical merge and/or strategy alliance.
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Li, Kun-Feng, and 李昆峰. "Studying The Effect Operating Conditions of Die Coating Process on PTFE-coated glass fabric." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/5znmmq.
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碩士國立臺北科技大學
化學工程研究所
102
The PTFE-coated glass fabric was prepared from inorganic materials (glass fiber) and organic materials (PTFE). In this study, the glass fabric was coated with PTFE solution by slit die and slot die respectively, then dried and sintered. The finished PTFE-coated fabric surface was observed by Scanning Electron Microscope (SEM) and its breaking force test was conducted by complying with CNS 12915 L3233 and ASTM 5035-11. Based on coating thickness or coating cover factor, it was found die coating was better than dip coating. The breaking force of coated fabric not only depends on drying conditions but also sintering times and temperature. Reducing sintering time and temperature can significantly increase the breaking force. Because slot die coating can achieve to saturation in shorter time, so the finished fabric has a larger breaking force than that of slit die coating. Finally, experimental data obtained was transformed into dimensionless groups. When the ratio of inertial force/viscous force (Reynolds number) to viscous force/surface tension (Capillary number) is smaller than 450, the dimensionless coating width W^* becomes unstable and non-uniform. This result can apply to multiple inlet of larger than 60cm wide slot die coaters.
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Lin, Yong Shun, and 林雍舜. "The design of an automated defectives identification system using machine vision for glass fabric inspection." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/52719928816153390361.
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碩士國立勤益技術學院
工業工程與管理系
94
A perfect E-class glass fabric will be the major role of prevention electricity short circuit, which will cause unstable performance of a complete electronic device, e.g. isolation of high radio frequency, and electrics insulation. There are many chemical processes need to be performed to make the glass fabric, therefore preventing a final lot-out is major concerned by glass fabric manufactures. A vision check by bare eyes is performed for the final quality check, but vision check wastes time and labor fatigue concerned. Some major algorithms for identifying defectives will be elaborate developed in this research, a machine vision inspection will be adapted, and pattern matching will be performed to reduce inspection risk and identify the defectives type.
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Hsiao, H. L., and 蕭憲隆. "An empirical study of process capability improvement-a case study of a glass fabric maker." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/83381918871830633978.
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碩士國立勤益技術學院
工業工程與管理系
94
New process or new raw material for the existing product is developed very quickly, as soon as life cycle of the product need to be extended,the improvement of the quality of the products has already become primary subject of industry's competition. The main topic of this research will adopt Quality Function Deployment(QFD) and implement the Taguchi Method to optimize process control.These optimized processes will improve the quality of product. The Quality Function Deployment method is to assess the quality element between customer's demand and technology.As soon as the vital elements of quality by QFD has been found, and then the parameter design of Taguchi Method would be utilized, by using Orthogonal Array and Analysis of Variance(ANOVA) to find out the optimal factor and level in the element of quality process control. A process incapability index(Cpp)is adapted to estimated the yield rate of a fiber glass product.
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Xiong, Jun. "An investigation into reducing time dependent creep of a polyethylene geotextile using glass fiber yarns." 2014. http://hdl.handle.net/1993/23268.
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An investigation has been carried out to reduce the deformation behavior of polyethylene (PE) woven geotextile fabric by making PE fabric-glass yarn composite structure using stitching and laminating. The results showed that reinforcement significantly reduced the creep and IED as long as the tensile stress is lower than the total load bearing capacity of the glass yarns in the composite structure. However, the strength of PE-glass composite fabric was solely dependent on the strength of the glass yarns. The strength from PE yarns only contributes when all glass yarns are broken. Cast result of concrete columns using the glass yarn reinforced PE fabric by stitching method suggested that the glass yarn must face outside of the fabric formwork to avoid damage of both fabric surface and column surface.
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Lin, Yu-Che, and 林裕哲. "The Research on Marketing Structure and Behavior：The Comparative Analysis between Fiber Reinforcement Plastic and Electrical Glass Fabric." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/44682212175472622779.
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碩士國立臺灣大學
國際企業學研究所
92
Composite material is made of 2 or above kinds of chemical & engineering raw material with excellent strength at a light weight. Take resin and reinforcement material for example, they can be combined into reinforcement plastics, which is one type among composite material. However, accompanying with the changing of international environment, shift abroad has become an hot issue of enterprises management in recent years and polymer composite is no exception. So far, manufacturing basement of tennis racket and golf instruments have shifted abroad, and PCB is on its way to Mainland China step by step. As a result, how to take advantage of China’s workforce, to strengthen our capability and to prevent its inanition are the serious topics to get foothold in Taiwan. Therefore, choosing fiberglass industry in Taiwan as my object of research, ranged from traditional fiberglass reinforcement plastics ( including thermoplastic and thermosetting plastics ) to electrical fabric market, there is obvious difference in price, scale and capability between fiber and fabric, which are made of glass, while the development of Taiwanese fiberglass industry has been learned. Therefore, the thesis takes the concept of Structure-Conduct-Performance (SCP) from industrial economics as a basis of my research and introduces the concepts of marketing segmentation from STP marketing, competitive strategy from Porter to be the variables of business behavior to observe both strategy and marketing positioning and realized marketing mix in order to find the difference of marketing strategy and structure between each company, to connect with their specific performance to find the difference and critical factor of the reason. Then, the last will take a further analysis to differentiate the structure, behavior, and performance between FRP and electrical fabric glass market in order to map out future development for related firms. According to conceptual logic framed in the context, empirical results show the following. 一、Marketing Structure and Strategic Behavior 1.The degree of competition between firms in electrical fabric market is mainly affected by market concentration, vertical integration, and product differentiation. 2.Marketing segmentation strategy toward both FRP & Fabric markets is not affected by the degree of competition. 3.Development of product property in marketing strategy is related to production differentiation in marketing structure. 二、Marketing Strategy and Competitive Stagegy 1.Marketing segmentation strategy is related to business competitive strategy. 2.The higher degree of production differentiation in market structure will make brand effect more critical. 三、Implement of Marketing-Mix 1.The higher degree of competition between firms will make the price more sensitive. 2.Electrical fabric firms tend to take direct-sale channel than FRP firms. 3.Both FRP & Fabric markets mainly promote through personal selling. 4.The performance of fabric firms is more sensitive to market conduct. However, FRP firms are more sensitive to marketing structure. Due to limitation on this research process conducted, some suggestions of future research are proposed to indicate a further direction for the later research.
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HSIAO, CHIA-FAN, and 蕭家帆. "Effect of Adding Chain Extending Agent and Nano-silica on Toughening of Glass Fabric Reinforced Epoxy Resin Composites." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/u3cx62.
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碩士逢甲大學
纖維與複合材料學系
105
Epoxy resin was brittle after hardening into a three-dimensional network structure. The force would produce cracks, and growth rapidly. So it need to improve the toughness and mechanical properties by modification. In this time, the epoxy resin was modified by adding chain extending agent and different proportions of nano-silica. And using DSC to examine the effect of modifiers on the glass transition temperature (Tg). The mechanical properties of epoxy resin /glass fabric composite laminate were investigated by Mode I fracture toughness, Mode II fracture toughness, flexural properties and interlaminar shear strength (ILSS). The Zeta Potential Analyzer was used to understand the different of nano- silica’s particle size. And the Field Emission Emission Scanning Electron Microscope (FE-SEM) to observe the failure morphology on the fracture surface of after fracture toughness test. With the high speed mixer and three-roll miller which can reduce the phenomenon of nano-silica agglomeration. Based on the DSC determined showed that glass transition temperature of cured resin system decreased with increasing of the chain extending agent. Because the soft chain caused by the increase in free volume. And when the nano-silica added in to the resin system, it would increasing the glass transition temperature. The flexure properties and ILSS all showed the same trend like glass transition temperature. The Mode I and Mode II fracture toughness of laminate enhance 55.7 % and 47 % with content 5 wt% of chain extending agent and 8 wt% of nano-silica. According to the FE-SEM observation found that with the increase of toughening agent, the broke section would become roughly.
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Hsing, Ruo-Feng, and 邢若楓. "Fabrication of molecularly imprinted polymer on modified glass fabric for determination of triazine in aqueous samples by HPLC-UV." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/3pwusy.
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碩士國立中興大學
化學系所
106
Triazine herbicides are one of the major herbicides widely used in agriculture. It can remain in the environment for a long time, and therefore can easily pollute groundwater and river water through water transfer. The research have indicated that exposure to triazine herbicides may cause diseases such as Parkinson''s disease and cancer. Due to the wide availability and toxicity of triazine herbicides, it is important to monitor their content in the environment. In this study, glass fabric were modified with molecularly imprinted polymers (MIPs) on the surface as sobent which has high selectivity to collect triazine in environment aqueous samples for HPLC-UV analysis. To modify the surface of glass fabric, 3-(trimethoxysilyl) propyl mthacrylate (MPS) were applied to build-up functional groups for bonding the MIPs which prepared by using Sebumeton,Terbutryn and Terbumeton as the template molecule, Methacrylic acid (MAA) and styrene as the functional monomers, acetonitrile as the solvent and porogen, Ethylene glycol dimethacrylate (EGDMA) and 2,2-Azobisisobutyronitrile (AIBN) as cross-linker and initiator. For this method, the significant parameters such as: pH value of sample solution, salting out effect, stirring rate, extraction time and elution solvent were investigated and optimized. Under the optimized condition, the linear equation for analytes of this study are built 0.2 to 20 ng mL-1 ,the limit of detection (LOD) are less than 0.03 ng mL-1 and the coefficient of determination (R2) are of 0.9973 to 0.9984. For this me thod, it has been proven to be a simple, rapid, non-expensive and high selectivity sample pretreatment method to extraction triazine in aqueous samples for HPLC-UV analysis.
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Tan, Hsueh-jen, and 譚學仁. "Using Continuous Filament or Glass-Fiber Woven Fabric to Reinforce High-Modulus Composite Geotextiles: Manufacturing Techniques and Property Evaluations." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/41242652874058130932.
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碩士逢甲大學
纖維與複合材料學系
104
There have been relatively few industrial projects focusing on the application and development of geotechnical engineering. Artificial fiber are developed, which allow diverse artificial fiber-based fabrics for wide application in the geo-engineering field, as geotextiles have functions of reinforcement, isolation, filter, drainage, and protection. In response, this study uses polyester (PET) fiber, polypropylene fiber (PP) and Kevlar fiber at different ratios to make basis fabrics, and examines the optimal parameters for the production of these basis fabrics. The fabrics are laminated with PET continuous (cont.) filament or glass-fiber woven fabrics, after which the whole is processed with needle punching and hot pressing. High-modulus composite fabrics are yielded and tested for mechanical properties and permeability. According to mechanical test results, the optimal parameters of high-modulus composite fabrics are Kevlar content (40 wt%), needle punch depth (19 mm) , and needle punch speed (250 needles/min). The needle punch depth pertains to the mechanical properties of the composite fabrics after cont. filament is added. In addition, the speed of the filament motor also affects the CV% of mechanical properties. Using cont. filament can mechanically improve the high-modulus composite geotextiles to a greater extent, in comparison to using glass-fiber woven fabric. Regardless of the reinforcement being cont. filament or glass-fiber woven fabric, the thermally treated composite geotextiles exhibit an increasing trend in mechanical properties. However, a small amount of samples exhibit permeability that is lower than the standard geotextile requirements (0.1 cm/s). The proposed high-modulus composite geotextiles can be produced with the corresponding required functions, such as reinforcement, drainage, and filtration, based on the applications in protecting hillsides, retaining roadbeds, and dredging reservoirs.
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Sousa, Guilherme José Miranda de. "Estruturas entrançadas para reforço do betão." Master's thesis, 2004. http://hdl.handle.net/1822/917.
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As excelentes propriedades e características dos materiais têxteis têm suscitado um grande interesse na sua utilização como reforço de matrizes constituídas por outros materiais, tais como polímeros, metais, cimento ou materiais cerâmicos, dando origem a materiais compósitos de reforço têxtil leves e extremamente resistentes, que podem ser utilizados na substituição dos materiais convencionas.
Estes materiais são actualmente aplicados nos mais variados sectores industriais tais como, aeroespacial, automóvel, marinha, construção civil, medicina, entre outros. O motivo principal reside nas muitas vantagens que estes oferecem, tais como, baixo peso associado com alta rigidez e resistência mecânica, excelentes resistências térmicas e à corrosão, grande versatilidade de moldar o material de acordo com as necessidades de projecto e alto potencial para reduzir custos, quer iniciais quer de montagem ou de reparação.
Na construção civil, as estruturas de betão estão, diversas vezes, sujeitas a cargas repetidas e a agentes agressivos que, por acções físicas e químicas, podem originar a fragilização mecânica das estruturas durante o seu período de vida, comprometendo a sua resistência e durabilidade. Um dos principais problemas que afecta o betão armado é a corrosão das armaduras em aço que leva à diminuição do seu desempenho.
Neste contexto, o objectivo principal deste trabalho consistiu no desenvolvimento e estudo de entrançados em fibra de vidro para reforço de materiais compósitos aplicados em vigas de betão, no sentido de substituir o aço e assim contribuir para a resolução do problema da corrosão. O trabalho desenvolvido iniciou-se com um estudo para entender o comportamento mecânico de entrançados reforçados axialmente (com alma) em fibra de vidro. Para tal utilizou-se uma entrançadeira vertical alimentada por várias mechas de fibra de vidro colocadas, durante o processo, no interior do entrançado. Os resultados obtidos demonstram um efeito extremamente positivo das mechas de fibra de vidro sobre as propriedades mecânicas do conjunto. Este estudo inicial permitiu ainda concluir acerca do número de mechas a utilizar no entrançado que serviria de base à produção dos varões em material compósito para reforço do betão. A fase seguinte do trabalho consistiu no desenvolvimento de um processo que permitisse a impregnação do entrançado com uma resina de poliéster. O processo desenvolvido ocorre durante o próprio entrançamento. Assim, as mechas de fibra de vidro são pré-impregnadas com a resina, imediatamente antes de serem alimentadas no entrançado. Desta forma consegue-se que a própria resina arrastada pelas mechas acabe por impregnar de forma mais ou menos uniforme o próprio entrançado. Os varões produzidos de acordo com a técnica explicada, foram ensaiados mecanicamente, no sentido de se perceber o seu comportamento mecânico. Os resultados obtidos revelaram um material com uma tensão de rotura compatível com a do aço, mas com um módulo de elasticidade inferior. Por último, produziram-se armaduras com os varões de material compósito, aplicadas posteriormente em vigas de betão. Fizeram-se ensaios de flexão sobre essas vigas e compararam-se os resultados com vigas reforçadas por armaduras convencionais em aço. Os resultados obtidos demonstraram que as vigas reforçadas pelos varões em material compósito apresentam um comportamento mecânico diferente das reforçadas pelo aço. Assim, para além de se poderem identificar diversos picos de tensão, na curva carga-alongamento, é possível verificar igualmente uma menor resistência.Due to their excellent properties and characteristics, fibrous materials have been applied in the reinforcement of polymers, metals, concrete and ceramic matrixes originating textile reinforced composite materials, with high ratio strength/weight, for the replacement conventional materials. These materials are used in a wide range of industrial fields including aerospace, automobile, marine, civil construction, medicine, and so on. The main reason are the advantages offered, such as, low weight associated to high stiffness and mechanical strength, excellent thermal and corrosion resistance, flexibility in moulding the material according to requirements and high potential to decrease initial and repairing costs. In civil construction, concrete structures are subjected to repeated loads and to aggressive agents that, by physical and chemical actions, may lead to diminish the mechanical performance of the structure during its life time. One of the most serious problems affecting concrete is the corrosion of the steel armours. The main objective of this work is the development and study of glass fiber braided fabrics to be used in the reinforcement of composite material bars for the application in concrete reinforcements. It is expected the use of these braided reinforced composite bars could overcome the corrosion problem of steel. The work started with a study on the mechanical behaviour and performance of glass fiber braided fabrics axially reinforced (core reinforced). Samples have been produced in a vertical braided machine feeded by glass fiber rovings inserted into the braided fabric. The results show a good effect of the axial rovings in the mechanical performance of the braided fabric. This initial study has permitted to conclude on the number of rovings to be used in the braided fabric. The following step of the work consisted in the development of a process to impregnate the braided fabrics with a polyester resin. In this process the glass fiber rovings are pre-impregnated before being fed into the braiding fabric. The braided fabric is full impregnated during the braided process. The composite materials thus obtained have been tested in order to understand their mechanical behaviour and performance. The results show a compatible ultimate stress and a minor modulus of elasticity when compared to steel. Armours with braided reinforced composite bars have been produced and applied in the production of concrete reinforced beams. Flexural tests have been undertaken and the results compared with those of concrete bars reinforced by steel armours. The results obtained show a different behaviour. In the load-extension curves of the beams with braided reinforced composite bars it is possible to identify different peaks corresponding to the break of the bars while in the steel reinforced bars this curve is much more uniform. Moreover, it is also possible to verify a minor failure stress of the beams with braided reinforced composite bars.
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Tsai, Chia-Feng, and 蔡嘉峰. "Synthesis of Nano Mica contained Water-Borne Polyurethane for Glass Fabrics." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/mc732b.
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碩士國立臺北科技大學
有機高分子研究所
99
In this study was used the method of surface modified treatment to improve the adhesion of glass fabrics and water-borne polyurethane/nano Mica. First, the un-sizing glass fabrics dipped in the silane coupling agent so that covered on the surface of glass fiber to enhance the glass fiber hydrophilic function resulting from improving the processing characteristics for coating on the glass fabrics. Both ends of the silane coupling agent and glass fiber surface were reacted with polyurethane water-borne/Mica Nanocomposites to produce chemical bonding, respectively. The glass fabrics were coated with water-borne polyurethane/Mica resin resulting in interacting with fiber to form the protection film on the surface of glass fibers to improve the defect of loose glass fibers and enhance the thermal stability, chemical stability of process functional glass fabrics. Water-borne polyurethane with the diisocyanate group was reacted with the various molar ratio (1 wt%、3 wt%、5 wt%) of nano Mica including amino functional group to produce the chemical bond. Water-borne polyurethane/Mica nanocomposited materials were then used by FT-IR、TGA、DSC、SEM、and potential size analyze these chemical structure, thermal properties, surface morphology, molecular weight and particle size….etc. Moreover, the multifunctional glass fabrics were fabricated by dipped on the glass fabrics with coupling agent combined by FT-IR、SEM、UV-vis、Water uptake、Adhesion strength and Weatherability analyze with coating the water-borne polyurethane/Mica nanocomposited materials.
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Yang, Xiu-Zhi, and 楊修智. "Mechanical Properties of Glass Fabrics/Corrugated Board/Epoxy Sandwich Composite Materials." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/81259177389301788512.
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碩士萬能科技大學
材料科學與工程研究所在職專班
100
The main objective of this thesis was to study the mechanical characteristics of glass fabrics/corrugated board/epoxy sandwich composites with a corrugated board as a core layer. The core layer composites were made with corrugated board and epoxy resin. The core layer composites were then stacked with glass fabrics and epoxy resin on the top and bottom surfaces to fabricate sandwich composites. Four composite materials, pure corrugated board, impregnated corrugated board, glass mat/epoxy and glass net fabric/epoxy, were developed in the current study. Furthermore, the flat-wise compressive, three-point bending and impacting characteristics were discussed in details. Experimental results revealed that the glass mat/corrugated board/epoxy sandwich composites have well reinforced efficient while compression test, three-point bending test, impacting test.
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YAN, FU-SHAN, and 顏福杉. "A study of the mechenical properties of epoxy resin composites reinforced with tridimensional glass fiber fabrics." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/88958418481738144308.
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賴其正. "A study of the fatigue strength of knitted fabrics of carbon fiber and glass fiber reinforced epoxy resin." Thesis, 1989. http://ndltd.ncl.edu.tw/handle/20154363722327470354.
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楊棟賢. "A study of the impact strength of knitting fabrics of carbon fiber and glass fiber reinforced epoxy resin." Thesis, 1988. http://ndltd.ncl.edu.tw/handle/55825801485212102246.
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吳繼仁. "A study of the mechanical properties of weaving and knitting fabrics of carbon fiber and glass fiber reinforced epoxy resin." Thesis, 1987. http://ndltd.ncl.edu.tw/handle/02013065746321370690.
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