The Experts below are selected from a list of 23988 Experts worldwide ranked by ideXlab platform
Enrique V Barrera - One of the best experts on this subject based on the ideXlab platform.
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processing a glass fiber reinforced vinyl ester composite with nanotube enhancement of interlaminar shear strength
Composites Science and Technology, 2007Co-Authors: Ashraf Imam, Roger Crane, Karen Lozano, Valery N Khabashesku, Enrique V BarreraAbstract:Abstract Carbon nanotubes have been considered as a promising means of enhancing the properties of advanced composites in a range of polymer systems. Expected property enhancements include high strength and stiffness, improved toughness, impact and through-thickness properties. Z -axis properties like shear strength are of special interest for laminated composite structures subjected to transverse loads. This paper reports the processing of a glass fiber reinforced vinyl ester composite with nanotube integration and examines the reinforcement potential on interlaminar shear strength. Several sidewall functionalized nanotube derivatives were also prepared in order to obtain high dispersion and Matrix Bonding. Carbon nanotube enhanced vinyl ester/glass fiber composites were fabricated by a vacuum assisted resin transfer molding process. Overcoating the glass fiber weave with nanotubes and processing modification led to enhancement of the interface properties. A maximum of 45% increase in shear strength over control sample was observed on several types of nanotubes with a very small amount of nanotubes (0.015 wt%) coated in the midplane ply.
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processing a glass fiber reinforced vinyl ester composite with nanotube enhancement of interlaminar shear strength
Composites Science and Technology, 2007Co-Authors: Jiang Zhu, Ashraf Imam, Roger Crane, Karen Lozano, Valery N Khabashesku, Enrique V BarreraAbstract:Abstract Carbon nanotubes have been considered as a promising means of enhancing the properties of advanced composites in a range of polymer systems. Expected property enhancements include high strength and stiffness, improved toughness, impact and through-thickness properties. Z -axis properties like shear strength are of special interest for laminated composite structures subjected to transverse loads. This paper reports the processing of a glass fiber reinforced vinyl ester composite with nanotube integration and examines the reinforcement potential on interlaminar shear strength. Several sidewall functionalized nanotube derivatives were also prepared in order to obtain high dispersion and Matrix Bonding. Carbon nanotube enhanced vinyl ester/glass fiber composites were fabricated by a vacuum assisted resin transfer molding process. Overcoating the glass fiber weave with nanotubes and processing modification led to enhancement of the interface properties. A maximum of 45% increase in shear strength over control sample was observed on several types of nanotubes with a very small amount of nanotubes (0.015 wt%) coated in the midplane ply.
R Naslain - One of the best experts on this subject based on the ideXlab platform.
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fiber reinforced ceramic Matrix composites state of the art challenge and perspective
Kompozyty, 2005Co-Authors: R NaslainAbstract:(ARTYKUŁ ZAMAWIANY) Ceramic Matrix composites (CMCs) are non-brittle structural ceramics for application at high temperatures. They consist of ceramic fibers embedded in a ceramic Matrix, the fiber/Matrix Bonding being controlled through weak enough interphase. CMCs are processed following gas, liquid or powder routes. Their main properties are presented and discussed, including mechanical behavior, thermal conductivity, dimensional stability, friction and the effects of an oxidizing atmosphere or nuclear radiations. Finally, the applications of CMCs are briefly presented in rocket motors, spacecraft thermal protection, aerojet engines and cogeneration gas turbines, braking systems and high temperature nuclear reactors.
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sic Matrix composite materials for advanced jet engines
Mrs Bulletin, 2003Co-Authors: R Naslain, F ChristinAbstract:SiC-Matrix composites consist of ceramic fibers embedded in a silicon carbide Matrix produced by gas-, liquid-, or solid-phase routes, yielding materials that differ in Matrix crystallinity, residual porosity, and thermal properties. These composites can be highly engineered in terms of the nature of the reinforcement, the interphase used to control the fiber-Matrix Bonding, the Matrix, and the seal coating used. SiC-Matrix composites are refractory ceramics displaying outstanding mechanical and thermal properties at high temperature. Their durability in oxidizing atmospheres and under load exceeds 1000 h at temperatures of up to ∼1200°C. They have been used to fabricate different components of the hot zone of jet engines with significant weight savings and an increase in performance. This article reviews the state of the art in the processing, materials design, and properties of these composites as well as their applications in advanced jet engines.
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the design of the fibre Matrix interfacial zone in ceramic Matrix composites
Composites Part A-applied Science and Manufacturing, 1998Co-Authors: R NaslainAbstract:Abstract Ceramic Matrix composites are tough when the fibre-Matrix Bonding is properly controlled during processing, via the use of an interphase. The interphase is either formed in situ as the result of fibre-Matrix interactions or deposited on the fibre surface prior to composite fabrication. It has several key functions, including crack deflection, load transfer, diffusion barrier and residual stress relaxation. Four types of interphase are depicted involving weak interfaces, materials with a layered crystal structure (pyrocarbon, BN, micas and phyllosiloxides, or materials with the β-alumina/magnetoplumbite structures), multilayers such as (PyC-SiC) n or (BN-SiC) n or, finally, porous materials. Achieving high mechanical properties and long lifetimes in severe environments require a subtle design of the fibre-Matrix interfacial zone, which is depicted for Nicalon/glass–ceramic and Nicalon/SiC-Matrix composites.
Ashraf Imam - One of the best experts on this subject based on the ideXlab platform.
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processing a glass fiber reinforced vinyl ester composite with nanotube enhancement of interlaminar shear strength
Composites Science and Technology, 2007Co-Authors: Ashraf Imam, Roger Crane, Karen Lozano, Valery N Khabashesku, Enrique V BarreraAbstract:Abstract Carbon nanotubes have been considered as a promising means of enhancing the properties of advanced composites in a range of polymer systems. Expected property enhancements include high strength and stiffness, improved toughness, impact and through-thickness properties. Z -axis properties like shear strength are of special interest for laminated composite structures subjected to transverse loads. This paper reports the processing of a glass fiber reinforced vinyl ester composite with nanotube integration and examines the reinforcement potential on interlaminar shear strength. Several sidewall functionalized nanotube derivatives were also prepared in order to obtain high dispersion and Matrix Bonding. Carbon nanotube enhanced vinyl ester/glass fiber composites were fabricated by a vacuum assisted resin transfer molding process. Overcoating the glass fiber weave with nanotubes and processing modification led to enhancement of the interface properties. A maximum of 45% increase in shear strength over control sample was observed on several types of nanotubes with a very small amount of nanotubes (0.015 wt%) coated in the midplane ply.
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processing a glass fiber reinforced vinyl ester composite with nanotube enhancement of interlaminar shear strength
Composites Science and Technology, 2007Co-Authors: Jiang Zhu, Ashraf Imam, Roger Crane, Karen Lozano, Valery N Khabashesku, Enrique V BarreraAbstract:Abstract Carbon nanotubes have been considered as a promising means of enhancing the properties of advanced composites in a range of polymer systems. Expected property enhancements include high strength and stiffness, improved toughness, impact and through-thickness properties. Z -axis properties like shear strength are of special interest for laminated composite structures subjected to transverse loads. This paper reports the processing of a glass fiber reinforced vinyl ester composite with nanotube integration and examines the reinforcement potential on interlaminar shear strength. Several sidewall functionalized nanotube derivatives were also prepared in order to obtain high dispersion and Matrix Bonding. Carbon nanotube enhanced vinyl ester/glass fiber composites were fabricated by a vacuum assisted resin transfer molding process. Overcoating the glass fiber weave with nanotubes and processing modification led to enhancement of the interface properties. A maximum of 45% increase in shear strength over control sample was observed on several types of nanotubes with a very small amount of nanotubes (0.015 wt%) coated in the midplane ply.
R Menendez - One of the best experts on this subject based on the ideXlab platform.
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influence of titanium carbide on the interlaminar shear strength of carbon fibre laminate composites
Composites Science and Technology, 2011Co-Authors: Antonio Lopezvalverde Centeno, J Vina, C Blanco, R Santamaria, M Granda, R MenendezAbstract:The potential use of carbon fibre laminate composites is limited by the weak out-of-plane properties, especially delamination resistance. The effect of incorporating titanium carbide to the mesophase pitch Matrix precursor of carbon fibre laminate composites on interlaminar shear strength is studied both on carbonised and graphitised composites. The presence of titanium carbide modifies the optical texture of the Matrix from domains to mosaics in those parts with higher concentrations and it contributes to an increase of fibre/Matrix Bonding. This fact produces an increase of the interlaminar shear strength of the material and changes the fracture mode.
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influence of fibre Matrix interface on the fracture behaviour of carbon carbon composites
Journal of The European Ceramic Society, 2003Co-Authors: C Blanco, M Granda, E Casal, R MenendezAbstract:Abstract This paper studies the fracture behaviour of unidirectional carbon fibre reinforced carbon Matrix composites and its relation with the type of fibre–Matrix interface developed in the composite. Model unidirectional carbon–carbon composites were prepared using the same type of fibre and different pitches as Matrix precursors. These included both commercial pitches and synthesized in the laboratory ones. The chemical composition of the Matrix precursor determined the type of microstructure developed in the composite, this microstructure seems to govern the fibre-Matrix Bonding and in turn controls the fracture behaviour of the composite. In general, a Matrix texture of mosaic (small size) seems to yield a good fibre-Matrix Bonding, making the materials to have higher interlaminar shear strength but having at the same time brittle fracture behaviour. On the other hand, composites where larger textures were developed in the Matrix seem to have a poorer fibre-Matrix Bonding. This made the composites to have lower strength, but it allowed deBonding of fibre and Matrix during fracture. As a result, these materials showed pseudo-plastic failure behaviour. Other examples of both types of fracture behaviour associated with the change in microstructure and fibre–Matrix interface are discussed.
Karen Lozano - One of the best experts on this subject based on the ideXlab platform.
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processing a glass fiber reinforced vinyl ester composite with nanotube enhancement of interlaminar shear strength
Composites Science and Technology, 2007Co-Authors: Ashraf Imam, Roger Crane, Karen Lozano, Valery N Khabashesku, Enrique V BarreraAbstract:Abstract Carbon nanotubes have been considered as a promising means of enhancing the properties of advanced composites in a range of polymer systems. Expected property enhancements include high strength and stiffness, improved toughness, impact and through-thickness properties. Z -axis properties like shear strength are of special interest for laminated composite structures subjected to transverse loads. This paper reports the processing of a glass fiber reinforced vinyl ester composite with nanotube integration and examines the reinforcement potential on interlaminar shear strength. Several sidewall functionalized nanotube derivatives were also prepared in order to obtain high dispersion and Matrix Bonding. Carbon nanotube enhanced vinyl ester/glass fiber composites were fabricated by a vacuum assisted resin transfer molding process. Overcoating the glass fiber weave with nanotubes and processing modification led to enhancement of the interface properties. A maximum of 45% increase in shear strength over control sample was observed on several types of nanotubes with a very small amount of nanotubes (0.015 wt%) coated in the midplane ply.
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processing a glass fiber reinforced vinyl ester composite with nanotube enhancement of interlaminar shear strength
Composites Science and Technology, 2007Co-Authors: Jiang Zhu, Ashraf Imam, Roger Crane, Karen Lozano, Valery N Khabashesku, Enrique V BarreraAbstract:Abstract Carbon nanotubes have been considered as a promising means of enhancing the properties of advanced composites in a range of polymer systems. Expected property enhancements include high strength and stiffness, improved toughness, impact and through-thickness properties. Z -axis properties like shear strength are of special interest for laminated composite structures subjected to transverse loads. This paper reports the processing of a glass fiber reinforced vinyl ester composite with nanotube integration and examines the reinforcement potential on interlaminar shear strength. Several sidewall functionalized nanotube derivatives were also prepared in order to obtain high dispersion and Matrix Bonding. Carbon nanotube enhanced vinyl ester/glass fiber composites were fabricated by a vacuum assisted resin transfer molding process. Overcoating the glass fiber weave with nanotubes and processing modification led to enhancement of the interface properties. A maximum of 45% increase in shear strength over control sample was observed on several types of nanotubes with a very small amount of nanotubes (0.015 wt%) coated in the midplane ply.