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 123 for “"Fiber Composites"”.
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Piezoelectric fiber composites for structural actuation
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
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Active fiber composites for structural actuation
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
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Thermoplastic active fiber composites for structural actuation
… inability to conform to curved surfaces. Active Fiber Composites (AFCs) have been developed to address some of these shortcomings of monolithic piezoceramic materials. AFCs are thin composite plies comprised of unidirectional piezoelectric fibers imbedded in a thermoset matrix. An electric field …
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Viscoplastic Study of 3D Printed Carbon Fiber Composites
… the viscoplastic response of 3D printed carbon fiber composites made using the Mark Two 3D printer by Markforged. The ability to manufacture composites through the use of 3D printers is relatively new and contains gaps in the various mechanical properties of the material, of interest is the …
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ANALYZING THE INTERFACIAL PROPERTIES OF NATURAL FIBER COMPOSITES
… with environmental responsibility. Conventional composites, typically composed of synthetic fibers and petroleum-based resins, offer outstanding mechanical properties but are associated with significant ecological drawbacks due to their non-biodegradable nature and energy-intensive production. …
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Stiffness and Strength Predictions of Discontinuous Fiber Composites
… lead to the certification of discontinuous fiber composites based on analysis and modest experimental verification. A discontinuous fiber composite (DFC) material system called HexMC is considered in this study. A stochastic (Monte Carlo-type) finite-element modeling approach called the …
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Analysis of matrix damage in single fiber composites
<p>"A unidirectional fiber-reinforced composite under a tensile load in the direction of the fibers develops equal axial strains in the fiber and the matrix, if there are no initial cracks and the fiber/matrix interface is perfectly bonded. With further increase in the load, the fiber or the matrix …
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Damage development in fiber composites due to bearing
Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1983.
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Detecting Delamination in Carbon Fiber Composites Using Piezoresistive Nanocomposites
<p>Carbon fiber prepreg composites are utilized successfully as structural materials for different lightweight aerospace applications. Delamination is a critical failure mode in these composite materials. As composite plies separate from each other, the composite loses some of its ability for …
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Macro-Fiber Composites for Sensing, Actuation and Power Generation
… research presented in this thesis uses the macro-fiber composite (MFC) actuator that was recently developed at the NASA Langley Research Center for two major themes, sensing and actuation for vibration control, and power harvesting. The MFC is constructed using piezofibers embedded in an epoxy …
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The interfacial shear stress failure of flawed fiber composites
… expresses the expected length of discontinuous fiber segments in a uniaxially aligned fiber reinforced composite. The strength of elemental volumes of fiber, used in this derivation are inferred from 1ength versus strength tests.on individual fibers. The fibers are assumed to have statistically …
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Nonlinear Mechanical and Actuation Characterization of Piezoceramic Fiber Composites
… However, actuators with piezoceramic fibers and interdigitated electrodes have risen to the forefront of the intelligent structures community due to their increased actuation capability. However, their fiber-reinforced construction causes them to exhibit anisotropic piezomechanical …
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Development of corrosion resistant aluminum alloys for graphite fiber composites
Includes bibliographical references.
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Prediction of Fiber Orientation During Processing of Short Fiber Composites
The fiber orientation pattern created by the flow of a suspension of short fibers controls the physical and mechanical properties of a short fiber composite material. The orientation of the fibers at any point in the composite plays the role of a structural state variable. Two sets of even-order …
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Toughened bismaleimides, their carbon fiber composites and interphase evaluation studies
… as matrix resins for high performance composites. Modifier molecular weight, end group functionality, backbone structure and weight percent incorporation were all studied with respect to their influence on K<sub>lc</sub>, fracture toughness properties. Increases in fracture toughness …
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The nonlinear viscoelastic behavior of adhesives and chopped fiber composites
The viscoelastic behavior of a chopped glass fiber/polyester sheet molding compound (SMC-25) and of a modified epoxy adhesive (Metlbond 1113-2) as determined by creep and creep recovery tests is presented. A nonlinear viscoelastic characterization method of Schapery is presented and applied to the …
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Carbon nanotube growth on challenging substrates : applications for carbon-fiber composites
Nanoengineered hierarchal fiber architectures are promising approaches towards improving the inter- and intralaminar mechanical properties (e.g., toughness and strength) and non-mechanical properties of advanced fiber-reinforced composites such as graphite/epoxy. One fiber architecture of …
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Multi-Axis Material Extrusion Additive Manufacturing of Continuous Carbon Fiber Composites
… one way to address these limitations is to use fiber-reinforced materials in combination with multi-axis deposition strategies. In material extrusion, embedded fibers will align themselves along the deposition path, providing structural, thermal, and chemical improvements. Multi-axis toolpathing …
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Mechanical Properties of Random Discontinuous Fiber Composites Manufactured from Wetlay Process
The random discontinuous fiber composite has uniform properties in all directions. The wetlay process is an efficient method to manufacture random discontinuous thermoplastic preform sheets that can be molded into random composite plaques in the hot-press. Investigations were done on the molding …
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Interlaminar reinforcement of carbon fiber composites from unidirectional prepreg utilizing aligned carbon nanotubes
Advanced laminated composites suffer from a lack of out-of-plane strength and toughness, leading to delamination and other types of interlaminar failure. Aligned carbon nanotubes (A-CNTs) placed at the interlayer between plies of an aerospace grade carbon fiber reinforced plastic composite (CFRP) …
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