The Experts below are selected from a list of 37395 Experts worldwide ranked by ideXlab platform
Edson Cocchieri Botelho - One of the best experts on this subject based on the ideXlab platform.
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correlation between degree of crystallinity morphology and mechanical properties of pps carbon fiber laminates
Materials Research-ibero-american Journal of Materials, 2016Co-Authors: Natassia Lona Batista, Philippe Olivier, Gerard Bernhart, Mirabel Cerqueira Rezende, Edson Cocchieri BotelhoAbstract:The crystallization degree in semi-crystalline thermoplastics plays an important role in determining the final properties of Structural Composite Material (e.g. toughness, stiffness and solvent resistance). The main purpose of this work is to study different induced degrees of crystallinity in carbon fiber (CF) reinforced polyphenylene sulfide (PPS) Composites, by using three different cooling rates during hot compression molding processing (51%, 58% and 62% of crystallinity). In this study, the morphology, thermal and mechanical properties of the produced laminates were investigated and compared. The results showed an increase in the storage modulus (9.8%), Young's modulus (9.2%) and ILSS (14.2%) for the lower cooling rates. Evidences of fiber/interface improvement and crystallites nucleation on the fiber reinforcement surface were also identified.
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Correlation between degree of crystallinity, morphology and mechanical properties of PPS/carbon fiber laminates
Materials Research, 2016Co-Authors: Natassia Lona Batista, Philippe Olivier, Gerard Bernhart, Mirabel Cerqueira Rezende, Edson Cocchieri BotelhoAbstract:The crystallization degree in semi-crystalline thermoplastics plays an important role in determining the final properties of Structural Composite Material (e.g. toughness, stiffness and solvent resistance). The main purpose of this work is to study different induced degrees of crystallinity in carbon fiber (CF) reinforced polyphenylene sulfide (PPS) Composites, by using three different cooling rates during hot compression molding processing (51%, 58% and 62% of crystallinity). In this study, the morphology, thermal and mechanical properties of the produced laminates were investigated and compared. The results showed an increase in the storage modulus (9.8%), Young's modulus (9.2%) and ILSS (14.2%) for the lower cooling rates. Evidences of fiber/interface improvement and crystallites nucleation on the fiber reinforcement surface were also identified.
Ali Kallel - One of the best experts on this subject based on the ideXlab platform.
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Experimental study of relaxation process in unidirectional (epoxy/palm tree fiber) Composite
Journal of Molecular Liquids, 2010Co-Authors: I. Ben Amor, Z. Ghallabi, Hamid Kaddami, Mustapha Raihane, M. Arous, Ali KallelAbstract:Abstract New Structural Composite Material reinforced with unidirectional natural fibers is prepared. Investigation on the dielectric properties and behavior of the thermoset epoxy Composite based on cellulosic fibers has been carried on. For the Composite, tree relaxation processes were identified, namely the α mode relaxation associated with the glass transition of the epoxy resin matrix, the relaxation process associated with conductivity occurring as a result of the carrier charges diffusion noted for high temperature above glass transition and low frequencies, and interfacial or Maxwell–Wagner–Sillars relaxation that is attributable to the accumulation of charges at the palm tree fibers/epoxy resin interfaces.
Natassia Lona Batista - One of the best experts on this subject based on the ideXlab platform.
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correlation between degree of crystallinity morphology and mechanical properties of pps carbon fiber laminates
Materials Research-ibero-american Journal of Materials, 2016Co-Authors: Natassia Lona Batista, Philippe Olivier, Gerard Bernhart, Mirabel Cerqueira Rezende, Edson Cocchieri BotelhoAbstract:The crystallization degree in semi-crystalline thermoplastics plays an important role in determining the final properties of Structural Composite Material (e.g. toughness, stiffness and solvent resistance). The main purpose of this work is to study different induced degrees of crystallinity in carbon fiber (CF) reinforced polyphenylene sulfide (PPS) Composites, by using three different cooling rates during hot compression molding processing (51%, 58% and 62% of crystallinity). In this study, the morphology, thermal and mechanical properties of the produced laminates were investigated and compared. The results showed an increase in the storage modulus (9.8%), Young's modulus (9.2%) and ILSS (14.2%) for the lower cooling rates. Evidences of fiber/interface improvement and crystallites nucleation on the fiber reinforcement surface were also identified.
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Correlation between degree of crystallinity, morphology and mechanical properties of PPS/carbon fiber laminates
Materials Research, 2016Co-Authors: Natassia Lona Batista, Philippe Olivier, Gerard Bernhart, Mirabel Cerqueira Rezende, Edson Cocchieri BotelhoAbstract:The crystallization degree in semi-crystalline thermoplastics plays an important role in determining the final properties of Structural Composite Material (e.g. toughness, stiffness and solvent resistance). The main purpose of this work is to study different induced degrees of crystallinity in carbon fiber (CF) reinforced polyphenylene sulfide (PPS) Composites, by using three different cooling rates during hot compression molding processing (51%, 58% and 62% of crystallinity). In this study, the morphology, thermal and mechanical properties of the produced laminates were investigated and compared. The results showed an increase in the storage modulus (9.8%), Young's modulus (9.2%) and ILSS (14.2%) for the lower cooling rates. Evidences of fiber/interface improvement and crystallites nucleation on the fiber reinforcement surface were also identified.
Sarah B. Cox - One of the best experts on this subject based on the ideXlab platform.
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Processing and Material Characterization of Continuous Basalt Fiber Reinforced Ceramic Matrix Composites Using Polymer Derived Ceramics.
2014Co-Authors: Sarah B. CoxAbstract:The need for high performance vehicles in the aerospace industry requires Materials which can withstand high loads and high temperatures. New developments in launch pads and infrastructure must also be made to handle this intense environment with lightweight, reusable, Structural Materials. By using more functional Materials, better performance can be seen in the launch environment, and launch vehicle designs which have not been previously used can be considered. The development of high temperature Structural Composite Materials has been very limited due to the high cost of the Materials and the processing needed. Polymer matrix Composites can be used for temperatures up to 260C. Ceramics can take much higher temperatures, but they are difficult to produce and form in bulk volumes. Polymer Derived Ceramics (PDCs) begin as a polymer matrix, allowing a shape to be formed and cured and then to be pyrolized in order to obtain a ceramic with the associated thermal and mechanical properties. The use of basalt in Structural and high temperature applications has been under development for over 50 years, yet there has been little published research on the incorporation of basalt fibers as a reinforcement in the Composites. In this study, continuous basalt fiber reinforced PDCs have been fabricated and tested for the applicability of this Composite system as a high temperature Structural Composite Material. The oxyacetylene torch testing and three point bend testing have been performed on test panels and the test results are presented.
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Processing and Characterization of Basalt Fiber Reinforced Ceramic Composites for High Temperature Applications Using Polymer Precursors
2014Co-Authors: Sarah B. Cox, Donovan Lui, Jihua GouAbstract:The development of high temperature Structural Composite Materials has been very limited due to the high cost of the Materials and the processing needed. Ceramics can take much higher temperatures, but they are difficult to produce and form in bulk volumes. Polymer Derived Ceramics (PDCs) begin as a polymer matrix, allowing a shape to be formed and cured and then to be pyrolized in order to obtain a ceramic with the associated thermal and mechanical properties. The two PDCs used in this development are polysiloxane and polycarbosilane. Polysiloxanes contain a silicon oxycarbide backbone when pyrolized up to 1000 deg C. Polycarbosilane, an organosilicon polymer, contain a silicon-carbon backbone; around 1200 deg C, Beta-SiC begins to crystallize. The use of basalt in Structural and high temperature applications has been under development for over 50 years, yet there has been little published research on the incorporation of basalt fibers as a reinforcement in Composites. Basalt is a naturally occurring Material found in volcanic rock. Continuous basalt fiber reinforced PDCs have been fabricated and tested for the applicability of this Composite system as a high temperature Structural Composite Material. Thermal and mechanical testing includes oxyacetylene torch testing and three point bend testing.
C. Nardari - One of the best experts on this subject based on the ideXlab platform.
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Metal inserts in Structural Composite Materials manufactured by RTM
Composites Part A-applied Science and Manufacturing, 1999Co-Authors: B. Ferret, M. Anduze, C. NardariAbstract:Abstract Load transfer on a Structural Composite part can be carried out by means of metal inserts. Apart from their detachable features, their introduction in a Composite Material is not without consequence. This paper examines the impact of the inserts in a Structural Composite Material obtained by the Resin Transfer Moulding process. Numerical flow simulations, using RTMFLOT software developed by the “Ecole Polytechnique de Montreal”, have enabled us to optimize the injection process. These simulations, associated with microscopic observations, successfully confirm the introduction of inserts and the quality of fabric impregnation. These microscopic observations have located the presence of flaws (resin accumulation, fabric layer compression and cracks) thus enabling the manufacturing process to be optimized. The mechanical characteristics of this mounting have been obtained by tensile, compressive and flexural tests.
