Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 40 for “"Continuous Fiber"”.
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Towards Advancement of Continuous Fiber Composite Additive Manufacturing
… particularly in aerospace. Specifically, fiber reinforced polymers (both thermoplastic and thermoset) offer incredible weight savings, with mechanical properties comparable to metal alloys. In turn, AM can provide design freedom and unlimited component complexity, qualities unavailable …
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Fatigue Behavior Of Continuous Fiber-Reinforced Composite Beams
… taken to evaluate the fatigue behavior of glass fiber-reinforced composite beams. Due to their highly anisotropic properties, composite beams have different failure modes at different stages of fatigue life. The results of the four-point bending fatigue tests show that the material follows …
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Implementing Continuous Fiber Reinforcement for Concrete Additive Manufacturing
… This thesis proposes a method of extruding continuous fiber reinforcement during the 3D printing process. Reinforcement is important in the process of creating concrete structures because while concrete is strong in compression, it has almost no tensile capacity. Reinforcement compensates …
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Manufacturability and Analysis of Topologically Optimized Continuous Fiber Reinforced Composites
<p>Researchers are unlocking the potential of Continuous Fiber Reinforced Composites for producing components with greater strength-to-weight ratios than state of the art metal alloys and unidirectional composites. The key is the emerging technology of topology optimization and advances in additive …
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Manufacturing of advanced continuous fiber reinforced composites for high temperature applications
… is on the development of processes to produce continuous fiber reinforced materials from two state of the art resin systems. Two processes were developed to produce continuous fiber reinforced ceramic materials from a preceramic polymer. The first was a vacuum forming process developed using …
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Fiber fracture in continuous-fiber reinforced composite materials during cyclic loading
… due to the failure of its constituents, namely fibers and matrix in the present case. To date, no experimental data exists, to the author’s knowledge, to define the behavior of constitutive fibers of a composite structure throughout its life span. The prime candidate for a fiber-based …
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Mechanical and Thermal Characterization of Continuous Fiber-Reinforced Pyrolysis-Derived Carbon-Matrix Composites
… applications. The development of continuous fiber-reinforced pyrolysis-derived carbon-matrix composites aim to circumvent the issues surrounding the manufacturing and handling of conventional high-temperature composites. Polymer matrix composites (PMCs) have a number of attractive …
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Micromechanics analysis of space simulated thermal deformations and stresses in continuous fiber reinforced composites
… thermally induced deformations and stresses in continuous fiber-reinforced composites were investigated with a micromechanics analysis. The investigation focused on two primary areas. First, available explicit expressions for predicting the effective coefficients of thermal expansion (CTE's) for …
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Advanced Design Optimization for Composite Structure: Stress Reduction, Weight Decrease and Manufacturing Cost Savings
<p><em>An injection moldable chopped fiber composite actuator with detailed drawing and tolerances was designed within one year. A vendor was selected and a quote for injection molding tooling cost for production was obtained and the first prototype was built in addition of six months. The risks …
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Transverse fracture and fiber/matrix interface characteristics of hybrid ceramic matrix composites
… mechanical properties through the use of continuous fiber reinforcement; fine, randomly dispersed discontinuous fiber (or whisker) reinforcement; and a hybrid combination of both continuous and discontinuous fibers. This dissertation addresses two important aspects of determining and …
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Mechanical Property Characterization of Polymeric Composites Reinforced by Continuous Microfibers
… employed to understand the effects of various fibers, their volume fractions and matrix properties in polymer composites. However, these experiments require fabrication of various composites which are time consuming and cost prohibitive. Advances in computational micromechanics allow us to …
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Micromechanics-based approach to predict strength and stiffness of composite materials
… into account variations in the material at the fiber/matrix level. In addition, manufacturing techniques have advanced enough so that composites can be designed from the fiber/matrix level up. As a result, it is important to predict the effect microlevel variations in the material have on …
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Lyocell Fiber-Reinforced Cellulose Ester Composites-Manufacturing Considerations and Properties
… were prepared using high modulus lyocell fibers and cellulose acetate butyrate (CAB). Two reinforcement fiber types: fabric and continuous fiber tow were used. Fabric had advantages of uniform alignment and easier processing, but lacked the use as a unidirectional reinforcement and a …
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Steel-free hybrid reinforcement system for reinforced concrete flexural members
… system for concrete bridge decks by using continuous fiber-reinforced-polymer (FRP) rebars and discrete randomly distributed polypropylene fibers. This hybrid system may eliminate problems related to corrosion of steel reinforcement while providing requisite strength, stiffness, and desired …
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A model for the diaphragm forming process
… composites. This process involves stacking continuous fiber reinforced thermoplastic prepregs in an arbitrary sequence to form a laminate. Polymeric diaphragms are placed on top and bottom of the prepreg layers to hold the material. The diaphragms are larger than the prepreg so that the …
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Analysis of metal matrix composite structures using a micromechanical constitutive theory
The nonlinear behavior of continuous-fiber-reinforced metal-matrix composite structures is examined using a micromechanical constitutive theory. Effective lamina and laminate constitutive relations based on the Aboudi micromechanics theory are presented. The inelastic matrix behavior is modeled by …
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Direct Ink Writing of Functional Fiber/Granular Composites
… manufacturing route for fabricating functional fiber and granular composites with controlled architecture, tunable interfaces, and customized material distributions. Fiber reinforced composites offer high stiffness, strength, fatigue resistance, and functional anisotropy, while granular …
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Integrated analysis procedure of aerospace composite structure
… industry. The high stiffness to weight ratio of continuous fiber composites (CFC) makes CFCs one of the most important materials to be introduced in modern aircraft industry. In addition to inherent strength (per given weight) of CFCs, they also offer the unusual opportunity to design the …
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Design and Manufacturing of the Filament Collection and Diameter Measurement Systems of Fiber Extrusion Device for Educational Purposes
Fiber Extrusion Device (FrED) is a desktop fiber extrusion system that mimics continuous fiber draw process for hands-on learning and/or laboratory experience on data acquisition, control system, and smart manufacturing, and it allows users to perform experiments, vary manufacturing parameters, …
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Design and Manufacturing of Educational Fiber Extrusion Device and Smart Factory
Fiber Extrusion Device (FrED) is a desktop fiber extrusion system that mimics continuous fiber draw process for hands-on learning and/or laboratory experience on data acquisition, control system, and smart manufacturing. It allows learners to perform experiments, vary manufacturing parameters and …
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