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 59 for “"epoxy matrix"”.
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Epoxy matrix composite strain sensing and cure monitoring
… described, which permits the state of cure of an epoxy matrix to be monitored, when the sensor is embedded in a polymeric matrix composite. By using a glass rod with a retroreflecting end for the target fiber in the EFPI sensor, the intensity of the light reflected depends on the refractive index …
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The influence of surface properties on carbon fiber/epoxy matrix interfacial adhesion
… of composite materials depends not only on the matrix and the reinforcing fiber, but also to a great extent on the fiber/matrix interfacial adhesion. The focus of this work was to study carbon fiber surface chemical and physical properties and their effects on fiber/matrix adhesion. Untreated, …
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Fracture analysis of carbon fiber/epoxy matrix interface through microbond and cruciform tests
In fiber-reinforced polymeric-matrix composites, the fiber/matrix interface plays a key role in transferring loads from the fibers to the matrix through shear. In this project, we investigate numerically two tests, used to characterize the normal and shear interfacial failure of a carbon …
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Harakeke fibre as reinforcement in epoxy matrix composites and its hybridisation with hemp fibre
… used as reinforcement, while a low viscosity epoxy resin was used as the matrix. Short fibres were alkali treated before being used to reinforce epoxy, while long fibres were used as supplied. Short and long fibres were aligned using dynamic sheet forming and manual carding, respectively. …
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Assessment of dielectric models and their application to polymer matrix composites
… effect of hollow ceramic spheres embedded in the epoxy matrix on the dielectric behavior of composite was investigated in the 100 Hz to 100 kHz range. It was found that the dielectric constant of epoxy matrix can be reduced by mixing the matrix with hollow ceramic spherical inclusions. To predict …
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Preparation and Characterization of a Treated Montmorillonite Clay and Epoxy Nanocomposite
… nanocomposite materials. Since reinforcement of epoxy is important to the development of high strength adhesives and composite matrices, the introduction of montmorillonite to epoxy is of interest. Compositional effects on epoxy reactivity, on molecular relaxation, and on mechanical properties …
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Interphase properties and their effects on the compression mechanics of polymeric composites
… properties different from either the fiber or matrix, has a considerable influence composite material strength. The greatest obstacle, however, to this work lies in identifying the specific properties present in the interphase region of a composite and knowing how specific properties affect the …
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Hypervelocity Impact Analysis of Hybrid Nanocomposite Sensors for Inflatable Space Structures
… nanoplatelets (GNP) as fillers and flexible epoxy matrix, that are proposed to be used for sensing the impact damage by MMOD in space inflatable structures. CNT and GNP were chosen as fillers owing to their excellent electrical properties and piezoresistivity. A new method was developed to …
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Autonomic healing of low-velocity impact damage in woven fiber-reinforced composites
Polymer-matrix fiber-reinforced composites have seen increasing use in applications requiring high specific strength and stiffness. These materials typically show excellent in-plane properties but are particularly susceptible to transverse impacts. Impact can significantly reduce strength and the …
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Projectile impact damage in filament wound CFRP tubes : effect of stacking sequence on projectile kinetic energy dissipation
… T800 carbon fibre filament wound tubes in an epoxy matrix are investigated, having the following lay-up; laminate A - [-35°/35°/90°3/-35°/+35°/90°3/-35°/+35°] and laminate B - [90°6/(-35°/+35°)3]. The laminates underwent projectile impact up to and beyond their ballistic limits and the …
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Characterization of damage mechanisms and behavior in two-dimensionally braided composites subjected to static and fatigue loading
… consisting of graphite fibers in an epoxy matrix were tested under static and fatigue loading conditions to determine damage mechanism types and progressions. The braided architectures consisted of straight axial fiber bundles, which were surrounded by braider fiber bundles oriented …
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Design of Improved Ceramic/polymeric Composites
… of a new coupling agent for glass fiber/epoxy matrix composites. This interface consisted of a thin coating of activated carbon (ACI) with high surface area to take advantage of mechanical interlocking. Furthermore, the surface chemistry was modified to provide varying degrees of bonding …
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Preparación de nuevos nanocomposites multifuncionales de matriz epoxi basados en el empleo de materiales grafénicos
In this PhD Thesis, multifunctional epoxy matrix nanocomposite materials have been prepared and characterized, based on graphene related materials (GRMs). Four types of GRMs have been characterized by three different graphite exfoliation techniques: Liquid Phase Exfoliation (LPE) aiming to obtain …
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The Mechanical Thermal and Microstructural Behaviors of the Strip Silicates Reinforced Epoxy-based Nanocomposites
Ten different sets of epoxy samples with compositions from 0wt% to 8wt% nanoclay were prepared by mechanical stirring and then casting to mold dog-bone shape samples for tensile and other tests. A gradual trend of changes upon mechanical, thermal and microstructural behaviors were investigated. …
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Morphology Development and Fracture Properties of Toughened Epoxy Thermosets
The phase separation process of a rubber modified epoxy system during cure was analyzed by a model developed on the basis of a thermodynamic description of binary mixture and constitutive equations for nucleation and growth rates. As epoxy resins are cured, rubber molecules are precipitated from …
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Avaliação de concentração de tensão em dutos danificados sob pressão interna após reparo
… before and after applying glass fiber reinforced epoxy matrix laminate repairs with varying thicknesses. Small-scale steel pipe samples are submitted to denting and the resulting stress concentration in the damaged region is estimated under cyclic internal pressure, before and after repair …
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Multifunctionality in epoxy/glass fibers composites with graphene interphase
… synergetic effect of a graphene interphase in epoxy/glass fibers composites was investigated by coating glass fibers (GF) with graphene oxide (GO) and reduced graphene oxide (rGO) nanosheets by an electrophoretic deposition (EPD) technique. Graphite oxide was prepared using modified Hummers …
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Líquido iônico em matriz termorrígida como eletrólito para utilização em altas temperaturas
Flexible epoxy network loaded with high amount of ionic liquid 1-decyl-3- methylimidazolium bromide ([DMIM]Br) has been reported by using a mixture of polyol amine as curing agent. The ionic liquid presents good electrochemical response even at 170 °C, as no evidence of redox reactions was …
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Micro-Architected Carbon Composites
… Two different methods of infiltrating an epoxy matrix into these micro-lattices were tested, reaching fill percentages of ~96% and ~99%. Micro-architected carbon composites were created using the superior infiltration method, and all three stages (polymer, carbon, composite) were …
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Fabrication and characterization of cellulose nanocrystal enhanced sustainable polymer nanocomposites through surface chemistry and processing
… compatibility and overall performance of CNC/epoxy and CNC/polyamide nanocomposite.</p> <p>For a two-part epoxy system, a novel approach was taken to disperse CNC in epoxy matrix by pre-formulating CNC into the hardeners. Three types of hardeners were evaluated for their compatibility with …
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