Letteratura scientifica selezionata sul tema "Polyester glass-Fiber powders"

Composite materials play a vital role in many industrial applications. Researchers are working on fabrication of new composite materials worldwide to enhance the applicability of these materials. In view of this the mechanical performance of the composite material is essential. The objective of the present work is to analyze the effect of Silica powders content on the mechanical behavior of woolen E-glass 350gm-Glass fiber reinforced. Five different types of composites are fabricated using 0%,2%,4%,6%,8%wt of Silica powders with woolen-E glass fiber and polyester resin. The polyester resin, catalyst and accelerator are mixed in 50:1:1weight ratio in polyester matrix Silica. The aim of the project is to investigate the effect of Silica powders with woolen e-glass 350gm for making the composite material stronger and tougher. The investigation is carried out by mixing different weight percentages of the Silica powders with the polyester resin and preparing individual samples. After woolen- eglass preparation, the materials were properly mixed using the hand-lay techniques and different specimens were prepared with different compositions of the Silica powders. After all the samples were prepared, mechanical tests were carried out on the samples to ascertain the changesobserved due to the composition of Silica powders. The obtained results of various samples specimens were compared and graphically charted to characterize the new composites material. Keywords: Chopped Strand Mat (CSM) 450 G M-Glass Fiber; Silica Powder; Polyester Resin;Hand-Lay;Catalyst;Accelerator.

Composite materials play a vital role in many industrial applications. Researchers are working on fabrication of new composite materials worldwide to enhance the applicability of these materials. In view of this the mechanical performance of the composite material is essential. The objective of the present work is to analyze the effect of graphite powders content on the mechanical behavior of woolen E-glass 350gm-Glass fiber reinforced. Five different types of composites are fabricated using 0%,2%,4%,6%,8%wt of graphite powders with woolen-E glass fiber and polyester resin. The polyester resin, catalyst and accelerator are mixed in 50:1:1weight ratio in polyester matrix graphite. The aim of the project is to investigate the effect of graphite powders with woolen e-glass 350gm for making the composite material stronger and tougher. The investigation is carried out by mixing different weight percentages of the graphite powders with the polyester resin and preparing individual samples. After woolen- eglass preparation, the materials were properly mixed using the hand-lay techniques and different specimens were prepared with different compositions of the graphite powders. After all the samples were prepared, mechanical tests were carried out on the samples to ascertain the changesobserved due to the composition of graphite powders. The obtained results of various samples specimens were compared and graphically charted to characterize the new composites material. Keywords: MattE-Glass 350gm; Polyester resin; Graphite powders; Hand- Lay technique ; Catalyst & Accelerator.

The natural fiber-reinforced polymer composite is swiftly growing both in phrases of their industrial applications and fundamental research. They are renewable, cheap, absolutely or in part recyclable and biodegradable. The incorporation of herbal fibers consisting of sisal with glass fiber hybrid composites has additionally received growing industrial packages. Herbal and synthetic fibers are mixed in the same matrix (unsaturated polyester) to make sisal/glass fiber hybrid composites and the mechanical residences of those hybrid composites had been studied. A giant development in mechanical homes of sisal/glass fiber hybrid composites has been observed. the chalk powder (additive) is likewise introduced to the resin (unsaturated polyester) in proportions of 1%, 2%, 3% by way of weight of resin respectively and sisal/glass fiber hybrid composites were organized through the usage of this resin to take a look at the effect of chalk powder on mechanical homes of those hybrid composites. It is also found that because the chalk powder quantity increases tensile and flexural residences are decreases.

The semi-active vibration control of sandwich beams made of chopped strand mat glass fiber reinforced polyester resin polymer matrix composite (PMC) and magnetorheological fluid (MRF) core were experimentally investigated in this study. Two-, four- and six-layered glass fiber reinforced polyester resin polymer matrix composites were prepared using the hand-layup technique. The magnetorheological fluid was prepared in-house with 30% volume of carbonyl iron powder and 70% volume of silicone oil. Nine cantilever sandwich beams of varying thicknesses of the top and bottom layers glass fiber reinforced polyester resin polymer matrix composite beams and middle magnetorheological fluid core were prepared. The magnetorheological fluid core was activated with a non-homogeneous magnetic field using permanent magnets. The first three modes, natural frequencies and damping ratios of the glass fiber reinforced polyester resin polymer matrix composite-magnetorheological fluid core sandwich beams were determined through free vibration analysis using DEWESoft modal analysis software. The amplitude frequency response of the glass fiber reinforced polyester resin polymer matrix composite-magnetorheological fluid core sandwich beams through forced vibration analysis was determined using LabVIEW. The effect of various parameters such as magnetic flux density, thickness of glass fiber reinforced polyester resin polymer matrix composite layers and magnetorheological fluid core layer on the natural frequencies, damping ratio and vibration amplitude suppressions of the glass fiber reinforced polyester resin polymer matrix composite-magnetorheological fluid core sandwich beams was investigated. Based on the results obtained, 2 mm thickness top and bottom layers glass fiber reinforced polyester resin polymer matrix composite and 5 mm thickness magnetorheological fluid core sample have achieved a high shift in increased natural frequency, damping ratio and vibration amplitude suppression under the influence of magnetic flux density.

Banana stem (Musa Acuminata, MA) fiber is a free agricultural waste obtained after harvesting the fruit. When compared to synthetic fibers, banana fiber has significant weaknesses in composite production, such as low interfacial bond strength between the fiber and the matrix. The purpose of this research is to improve the impact strength of banana stem fiber composites by adding CaCO3 powder. The hot press technique is used to create composites. In the production of polyester composites, woven MA and CaCO3 stem fibers are prepared. An impact testing machine and a scanning electron microscope were used to investigate the effect on morphological properties and impact strength. The study's findings revealed that a polyester composite containing 10% banana stem fiber and 25% CaCO3 had the highest impact strength of 45.27 KJ/m2, which was associated with strong adhesion between the CaCO3-fiber and the polyester matrix. Fiber pullout, matrix cracking, and fiber debonding were all observed in the composite fracture morphology. The resulting composite properties could be used to replace palm fiber/fiber glass composites.

This study explored the possibility of recycling pre-fabricated carbon to use as filler in conjunction with talc to produce glass-fiber reinforced unsaturated polyester composites. Specimens with six different resin compositions were prepared using hand lay-up technique. The structure and property relationship was characterized through tensile test and microstructure analysis. Mechanical properties incorporated with the failure analysis suggest that the recycling of carbon is feasible. The application of the recycled carbon showed the improvement on the less variation on the mechanical properties. The percent elongation at break tended to reduce, and traded-off with the deterioration on tensile strength at break and elastic modulus. Mixing with 10-15 wt% recycled carbon and 5-10 wt% talc powder was suggested to yield the optimal tensile properties. Moreover, the recycled carbon previously coated with unsaturated polyester guides the uniform distribution when required to process with a high-polarity material by reducing the polarity effect.

AbstractThis study investigates the use of glass fiber-reinforced polyester (GRP) pipe powder (PP) for improving the bearing capacity of sandy soils. After a series of direct share tests, the optimum PP addition for improving the bearing capacity of soils was found to be 12%. Then, using the optimum PP addition, the bearing capacity of the soil was estimated through a series of loading tests on a shallow foundation model placed in a test box. The bearing capacity of sandy soil was improved by up to 30.7%. The ratio of the depth of the PP-reinforced soil to the diameter of the foundation model (H/D) of 1.25 could sufficiently strengthen sandy soil when the optimum PP ratio was used. Microstructural analyses showed that the increase in the bearing capacity can be attributed to the chopped fibers in the PP and their multiaxial distribution in the soil. Besides improving the engineering properties of soils, using PP as an additive in soils would reduce the accumulation of the industrial waste, thus providing a twofold benefit.

Currently, the composite materials make important great strides, considering their high mechanical properties. The studies relating to the conceptual, technical aspect and modeling of their mechanical behavior are more than desirable. The mechanical properties of the composite material depend on several factors as the nature of fibers, the fiber/matrix ratio, compatibility, homogeneity... In this study, we present the results of an experimental analysis of the behavior of the composite material, under a static and a dynamic loading. The composite material is composed respectively of the glass and metal fiber reinforcement. A various dimensions of the mesh are considering. The resin used is polyester Resow 55 E. The dynamic test ( Knoop test) is carried out on various specimens made up of an polyester resin RESOW 55 E reinforced with varied powder nature. It makes it possible to measure the hardness of composite materials. The analysis of the results shows clearly that the mechanical properties are strongly influenced by the dimensions of the elementary mesh of the fiber grid reinforcement. Based on experimental results, a Weibull modulus has been established for each specimen.

L’impression 3D du béton est l'une des technologies de construction les plus récentes. Elle offre des avantages et des opportunités par rapport à la méthode de construction traditionnelle, notamment la rapidité de la construction et la flexibilité de la conception architecturale. Cependant, la plupart des encres imprimables utilisées à ce jour nécessitent une forte teneur en ciment, dont la production génère de fortes émissions de CO2. La réduction de l'impact environnemental du béton imprimable est actuellement au centre des préoccupations des chercheurs qui visent à utiliser des matériaux alternatifs pour remplacer le ciment et réduire sa forte consommation dans les mélanges imprimables en 3D. Ces travaux de recherche portent sur la valorisation de matériaux alternatifs et innovants, actuellement considérés comme des déchets, dans l'impression 3D, afin de développer des mélanges imprimables à faible impact environnemental. Les matériaux alternatifs utilisés sont les sédiments de dragage, les poudres de fibres de verre polyester et la terre excavée. Ces matériaux sont choisis pour leur potentiel de valorisation, leurs propriétés intrinsèques et pour la nécessité urgente de les gérer en raison de leur grande quantité. Par ailleurs, peu de travaux sont consacrés à la valorisation de ces types de matériaux dans l'impression 3D du béton, d’où l’objectif de cette thèse. Une méthodologie expérimentale est ainsi mise en œuvre pour développer des mélanges optimaux. Tout d'abord, l'extrudabilité et la buildabilité sont évaluées et vérifiées afin de valider l’imprimabilité des mélanges développés. Ensuite, les propriétés à l’état frais et durci des mortiers imprimables sont étudiées. De plus, dans ces travaux, différentes échelles d'impression sont testées, depuis l'échelle du laboratoire jusqu’à celle d'une imprimante 3D. Dans la première partie de l’étude, le sédiment flash calciné est utilisé dans une formulation témoin imprimable, produisant un liant binaire (ciment/sédiment flash calciné) et un liant ternaire (ciment/sédiment flash calciné/filler calcaire), et les poudres de fibres de verre polyester sont utilisées, en tant que renfort, dans la formulation témoin, substituant une partie du sable. Dans la deuxième partie de l’étude, la terre est utilisée en tant que substitut total du sable. Les résultats de la première partie de l’étude montrent que plusieurs mélanges contenant du sédiment flash calciné sont imprimables. Ces mélanges contiennent 5 et 10% de sédiment lorsque le sédiment est valorisé seul, et 10 et 20% de sédiment lorsqu'il est valorisé avec 20 et 30% de filler calcaire, respectivement. Une substitution du ciment de 50% est donc atteinte avec le mélange imprimable contenant 20% de sédiment et 30% de filler calcaire. En outre, les mélanges contenant jusqu'à 10% de poudres de fibres de verre polyester sont également imprimables. D’autre part, les résultats de la deuxième partie de l’étude montrent que les formulations développées avec un taux élevé de terre excavée et une faible teneur en ciment sont imprimables et résistantes. Les formulations imprimables contiennent différentes quantités de terre, environ 2, 4 et 6 fois la quantité du ciment, la formulation la plus écologique ayant une teneur en terre de 1602 kg/m3 et une teneur en ciment de 282 kg/m3. Ces travaux de recherche mettent en évidence la possibilité de développer de nouveaux mélanges écologiques et résistants à base de matériaux de substitution, qui peuvent être utilisés dans des applications de construction par impression 3D
Concrete 3D Printing is one of the newest technologies in the field of construction. It offers advantages and opportunities over the traditional construction method, notably speed of construction and flexibility of architectural design. However, most printable materials used nowadays require a high cement content, the production of which generates significant CO2 emissions. Reducing the environmental impact of printable concrete is currently the focus of researchers who aim to use alternative materials to replace cement and reduce its high consumption in 3D printable mixes. This research work focuses on the valorization of alternative and innovative materials, currently considered as waste, in 3D printing, to develop printable mixtures with low environmental impact. The alternative materials used are dredged sediments, polyester glass-fiber powders and excavated soil. These materials are chosen for their recycling potential, their intrinsic properties, and the urgency of their management due to their large quantity. Moreover, little work is devoted to the recycling of these specific types of waste in concrete 3D printing, hence the objective of this thesis. An experimental methodology is therefore implemented to develop optimal mixtures. First, the extrudability and buildability are evaluated and verified in order to validate the printability of the developed mixes. Then, the fresh and hardened properties of the printable mortars are studied. Furthermore, in this research, different printing scales are tested, from the laboratory scale to the 3D printer scale. In the first part of the study, flash-calcined sediment is used in a printable control mixture, producing a binary binder (cement/flash-calcined sediment) and a ternary binder (cement/flash-calcined sediment/limestone filler), and polyester glass-fiber powders are used, as reinforcement, in the control mixture, substituting a portion of the sand. In the second part of the study, excavated soil is used as a total substitute for sand. The results of the first part of the study show that several mixtures containing flash-calcined sediment are printable. These mixtures contain 5 and 10% of sediment when used alone, and 10 and 20% of sediment when used with 20 and 30% of limestone filler, respectively. A cement substitution of 50% is therefore achieved with the printable mixture containing 20% of sediment and 30% of limestone filler. In addition, mixtures containing up to 10% of polyester glass-fiber powders are also printable. Furthermore, the results of the second part of the study show that formulations with a high content of excavated soil and a low cement content are printable and resistant. The printable formulations contain different amounts of soil, about 2, 4 and 6 times the amount of cement, with the most environmentally friendly formulation having a soil content of 1602 kg/m3 and a cement content of 282 kg/m3. This research work highlights the possibility of developing new ecological and resistant mixtures based on alternative materials that can be used in 3D printing construction applications