Reinforcements
Mostrando 25-36 de 69 artigos, teses e dissertações.
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25. Synthesis and characterization of polystyrene - layered double hydroxide nanocomposites via in situ polymerization / Sintese e caracterização de nanocompositos de poliestireno - hidroxido duplo lamelar via polimerização in situ
Over the past decade, polymer nanocomposites have attracted considerable interests in both academia and industry. This fact has connection with notable improvement in several properties these new materials have demonstrated with a small amount of nano-reinforcements. Some superior properties of polymer nanocomposites include barrier resistance and flame reta
Publicado em: 2010
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26. Biocomposites of lignin-, tannin- and glyoxal- based polymeric matrices reinforced with natural fibers / Biocompósitos a partir de matrizes poliméricas baseadas em lignina, tanino e glioxal reforçadas com fibras naturais
The present study aimed at developing biocomposites combining polymeric matrices and reinforcement agents, employing the highest possible proportion of materials obtained from natural sources. Phenolic resins are widely known and used due to their excellent properties, such as dimensional and thermal stability, flame resistance and chemical resistance. Howev
Publicado em: 2010
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27. Contribuição ao controle tecnológico de concretos estruturais de cimento Portland em ambientes marítimos. / Contribution to field quality control of Portland cement structural concretes in maritime environments.
A durabilidade dos edifícios em concreto armado só pode ser alcançada se for atendido um conjunto de requisitos e critérios nas etapas de projeto, execução e manutenção, nas quais os materiais envolvidos precisam ser adequadamente especificados, produzidos e empregados, de acordo com as respectivas rotinas dessas etapas. Assim, o requisito genérico
Publicado em: 2010
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28. Nanocompósitos de PVC com argilas organofílicas / PVC nanocomposites with organoclays
Polymer/ inorganic filler composite materials have increasingly attracted the attention of scientific community and industry over the past years due to their relatively ease of production and the possibility of obtaining unique properties as a result of these combinations. Simultaneously, recent advances in chemistry, physics and materials engineering have p
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/12/2009
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29. Mechanical and morphological characterizations of carbon fiber fabric reinforced epoxy composites used in aeronautical field
Carbon fiber reinforced composites (CFRC) have been used in aeronautical industry in the manufacture of different aircraft components that must attend tight mechanical requirements. This paper shows a study involving mechanical (flexural, shear, tensile and compressive tests) and morphological characterizations of four different laminates based on 2 epoxy re
Materials Research. Publicado em: 2009-09
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30. Projeto e elaboração de um dispositivo para remodelagem de fibras como subsistema do processo de enrolamento filamentar / Design and implementation of a remodeling fiber system to the filament winding process
This dissertation deals with the use of fiber reinforcements, in order to improve its appliance in filament winding machines. Throughout this work it is created a mechanism system to remodel the fiber filaments from rovings to the part that is been produced. Finite element analyses and experimental tests are performed to validate the system as part of the fi
Publicado em: 2009
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31. Estudo da resistência ao cisalhamento de interface em reforços unidirecionais / Study of interface shear strength in unidirectional reinforcements
Avaliou-se experimentalmente o comportamento da resistência ao cisalhamento de interface em reforços unidirecionais utilizados em estruturas de contenção. Para tal, foram realizados ensaios de arrancamento em fitas metálicas, utilizadas para soluções em terra armada e chumbadores, para soluções em solo grampeado. Os ensaios, em campo e laboratório,
Publicado em: 2009
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32. Estudo e caracterização de matérias-primas para o desenvolvimento de blocos sílico-calcários
The types of products manufactured calcium silicate blocks are very diversified in its characteristics. They include accessory bricks, blocks, products in dense material, with or without reinforcements of hardware, great units in cellular material, and thermal insulating products. The elements calcium silicate are of great use in the prefabricated constructi
Publicado em: 2009
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33. Avaliação de concretos reforçados por confinamento com manta de fibra de vidro estrutural e pré-impreganada
Due to the occurrence of diseases in the use of structural reinforcements in composites, with presentation of concrete blanket detachment, has been identified the need to evaluate the performance of concrete reinforced with glass fiber. This study aims to evaluate these concretes by means of testing methodologies, using concrete with low resistance with stru
Publicado em: 2009
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34. The effects of variable interval schedule on preference and liquid consumption by rats subjected to chronic mild stress / Efeitos do esquema de intervalo variável na preferência e no consumo de líquidos apresentados por ratos submetidos ao chronic mild stress
The Chronic Mild Stress (CMS) is an experimental animal model of depression induced by the exposure of rats to a set of moderate and uncontrollable aversive stimuli in a long and uninterrupted period of time. The purpose of this study was to investigate the relationship between performance in variable interval schedule of behavior and exposure to the protoco
Publicado em: 2008
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35. DYNAMIC ANALYSIS OF A GEOSYNTHETIC REINFORCED EMBANKMENT / ANÁLISE DINÂMICA DE UM ATERRO REFORÇADO COM GEOSSINTÉTICOS
The main objective of this research is to investigate the seismic response of a soil slope reinforced with geosynthetics, located in an active seismic region of Peru. The 10.40m high slope was reinforced with 9 horizontal layers of geosynthetics 10m long. The aspects studied in this work are related to the slope static stability, the dynamic response of the
Publicado em: 2008
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36. COMPORTAMENTO DE VIGAS DE CONCRETO ARMADO REFORÇADAS COM CFC SUJEITAS A CARGA DE IMPACTO / BEHAVIOR OF REINFORCED CONCRETE BEAMS STRENGTHENED WITH CFC UNDER IMPACT LOADING
An experimental study on the behavior of reinforced concrete beams strengthened in flexure with CFC under impact load was carried out in this work. The main objective was to investigate the effects of the loading rate on the strength of the beams. The variables were the loading rate and the ratio of fiber to steel reinforcement cross sections. All beams were
Publicado em: 2008