Glass Fibers
Mostrando 25-36 de 103 artigos, teses e dissertações.
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25. Tensile properties and color and mass variations of GFPR composites under alkaline and ultraviolet exposures
The objective of the present study was to evaluate the influence of two different environmental conditions on the quantitative change of color and mass, tensile strength and modulus of elasticity of glass fiber reinforced polymers (GFRP) produced in Brazil. For this purpose, specimens were taken from pultruded composite profiles with two different matrices (
Matéria (Rio J.). Publicado em: 2016-03
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26. Development of an ex vivo model of endovenous laser ablation of the great saphenous vein in a pilot study
ABSTRACT PURPOSE: To develop an ex vivo model for the analysis of macroscopic, histological and immunohistochemical changes after experimental endovenous laser ablation (EVLA) of the great saphenous vein (GSV). METHODS: We describe a model produced with glass tubes and introducer sheaths to mimic the physiological conditions of EVLA procedures, such as t
Acta Cir. Bras.. Publicado em: 2016-03
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27. Mechanical Properties of Glass Fiber Reinforced Polymers Members for Structural Applications
This paper presents the results of an experimental investigation aiming at determining the mechanical properties of Glass Fiber Reinforced Polymer (GFRP) element produced by the Brazilian industry to classify it for structural applications.. The material samples used in this work were (i) prepared in accordance to ABNT-NBR15708:2011 recommendations, (ii) ext
Mat. Res.. Publicado em: 03/11/2015
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28. Addition of mechanically processed cellulosic fibers to ionomer cement: mechanical properties
In this study, conventional restorative glass ionomer cement (GIC) was modified by embedding it with mechanically processed cellulose fibers. Two concentrations of fibers were weighed and agglutinated into the GIC during manipulation, yielding Experimental Groups 2 (G2; 3.62 wt% of fibers) and 3 (G3; 7.24 wt% of fibers), which were compared against a control
Braz. oral res.. Publicado em: 27/01/2015
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29. Prediction of energy absorption capability in fiber reinforced self-compacting concrete containing nano-silica particles using artificial neural network
The main objective of the present work is to utilize feedforward multi-layer perceptron (MLP) type of artificial neural networks (ANN) to find the combined effect of nano-silica and different fibers (steel, polypropylene, glass) on the toughness, flexural strength and fracture energy of concrete is evaluated.For this purpose, 40 mix plot including 4 series A
Lat. Am. j. solids struct.. Publicado em: 2014-11
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30. Post-consumer polyethylene terephthalate and polyamide 66 blends and corresponding short glass fiber reinforced composites
Blends of bottle-grade post-consumer polyethylene terephthalate (PET) and virgin polyamide 66 (PA66), over the complete composition range, and corresponding short glass fiber (SGF) reinforced composites were investigated. These materials were compounded in a twin-screw extruder and injection molded as standard specimens. Morphological investigation of the co
Mat. Res.. Publicado em: 16/09/2014
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31. Prediction of combined effects of fibers and nanosilica on the mechanical properties of self-compacting concrete using artificial neural network
In this research, the combined effect of nano-silica particles and three fiber types (steel, polypropylene and glass) on the mechanical properties (compressive, tensile and flexural strength) of reinforced self-compacting concrete(SCC) is evaluated. For this purpose, 70 mixtures in A, B, C, D, E, F and G series representing 0, 1, 2, 3, 4, 5 and 6 percent of
Lat. Am. j. solids struct.. Publicado em: 2014
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32. Durability under thermal loads of polyvinyl alcohol fibers
In the present paper, the thermal durability of polyvinyl alcohol fibers (PVA) was studied after fiber samples had been subjected to temperatures ranging from 90°C to 250°C. Residual mechanical properties, such as tensile strength, elastic modulus and elongation at break, and physical properties, such as density were determined. Weibull statistics were use
Matéria (Rio J.). Publicado em: 2013-12
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33. Glass fiber hybrid composites molded by RTM using a dispersion of carbon nanotubes/clay in epoxy
Nanocomposites based on epoxy and a mixture of clays and multi-walled carbon nanotubes (MWCNT) were produced by casting, and also molded by RTM using glass fibers as reinforcement, yielding a hybrid multi-scale micro/nanocomposite material. Two types of montmorillonite clays were used, natural (MMT-Na) and organophilic (MMT-30B). Higher viscosity was obtaine
Mat. Res.. Publicado em: 02/07/2013
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34. Influence of glass and sisal fibers on the cure kinetics of unsaturated polyester resin
The effect of grinded glass and sisal fibers (25 vol%) on the cure kinetics of composites of unsaturated polyester resin (UPR) was investigated by differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). The DSC analysis was carried out at four different heating rates (5, 10, 20 and 40 °C/min), and the cure enthalpy and activation ene
Materials Research. Publicado em: 26/06/2012
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35. Preparation and characterization of ramie-glass fiber reinforced polymer matrix hybrid composites
The use of ramie fibers as reinforcement in hybrid composites is justified considering their satisfactory mechanical properties if compared with other natural fibers. This study aims to verify changes in chemical composition and thermal stability of the ramie fibers after washing with distilled water. One additional goal is to study glass fiber and washed ra
Materials Research. Publicado em: 29/05/2012
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36. Flexural behavior of Sisal/Castor oil-Based Polyurethane and Sisal/Phenolic Composites
Natural fibers used as reinforcement of polymeric composites are interesting research subjects in polymer technology. Nowadays, these materials are being considered as a way to reinforce timber structures improvement. Fibers with larger structural applications are glass and carbon fibers, however, the use of natural fibers is an economic alternative and pres
Materials Research. Publicado em: 24/02/2012