Aderência à Madeira de Polímeros Reforçados com Fibras de Carbono sob Temperaturas Elevadas

Rubini, Lucas; Moraes, Poliana Dias de

doi:10.4322/floram.2012.028

Cited by 2 publications

(3 citation statements)

References 2 publications

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“…The test results of carbon fibre timber specimens and adhesive A are presented in Figure 6 together with the average results obtained by Serra (2010) and by Rubini and Moraes (2012), both for Pinus spp. At room temperature, the average shear strength of the 4 cm reinforcement was 8.1 MPa, while for the 5 cm reinforcement was 5.7 MPa.…”

Section: Shear Strength Of the Glued Interfacementioning

confidence: 86%

“…At high and adverse temperatures, the results were not conclusive on the influence of bonding length on the shear strength (SERRA, 2010). However, for a bonding length of 3 cm, Rubini and Moraes (2012) showed that the average shear strength decreases, in a non-linear way, with the increase in temperature. The pull-off tests showed that the mean tensile strength of the CFRP reinforcements is less than the mean strength directly on the wood surface (JUVANDES; BARBOSA, 2012), but nothing was found on the influence of temperature on these mechanical properties, requiring further research.…”

Section: Introductionmentioning

confidence: 98%

“…According to Balseiro (2007), the timber reinforcement with glued fibre laminates has, as the most common failure mode, the delamination, either in the bond line or in the adjacent area. Therefore, research was developed aimed at evaluating the adhesion of the interface reinforcement-wood by shear tests and pull-off of the interface (BALSEIRO, 2007;BARBOSA, 2008;CUSTÓDIO et al, 2009;SERRA, 2010;JUVANDES;BARBOSA, 2012;RUBINI;MORAES, 2012). The shear tests were performed with different bonding lengths, subjected to adverse environmental conditions, such as different wood moisture content and temperature.…”

Section: Introductionmentioning

confidence: 99%

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Influence of temperature on the adhesion of fibre reinforced polymers to timber surface

et al. 2019

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Carbon and glass fibre reinforced polymer composites are being increasingly used in timber structures, where they can be exposed to harsh temperature conditions. In order to be properly used, information is needed on their adhesion to the substrate. The objective of this research is to evaluate the influence of temperatures between 20 and 80 ºC on the adhesion of these reinforcements to the wood. The shear test of adhesive line and pull-off test of the reinforcement from wood surface were carried out using specimens made of Pinus spp. The results demonstrated that temperature causes the nonlinear reduction of the reinforcement adhesion. The specimens exposed to a temperature of 80 °C presented residual bond strength means of 34% and 20% of the mean strength at room temperature for CFRP and for GFRP, respectively. Caution in using the applied resins is required due to the presented behaviour even in the service temperature range specified by the manufacturers.

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Section: Shear Strength Of the Glued Interfacementioning

confidence: 86%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Influence of temperature on the adhesion of fibre reinforced polymers to timber surface

et al. 2019

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Análise Da Utilização De Fibras De Vidro Em Vigas De Madeira Laminada Colada Submetidas À Flexão Simples

Lenzi

Matias

Risson

2017

REEC

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RESUMO: A madeira apresenta boas propriedades mecânicas, porém há a necessidade de melhorias para que os elementos estruturais atendam as demandas solicitadas. Neste contexto, buscou-se com este trabalho analisar a utilização de fibras de vidro em vigas de madeira laminada colada submetidas à flexão simples para reforço estrutural, verificando o aumento de rigidez e resistência de seis vigas de madeira laminada colada através do adesivo Melamina Uréia Formaldeído MUF 1242 com o emulsificante líquido 2542, reforçadas com tecido unidirecional de fibra de vidro em conjunto com a resina epoxídica Compound, em comparação com uma viga de referência sem aplicação de reforço, assim como analisando a aderência entre o reforço e a superfície da madeira e também o modo de ruptura de cada viga. A aderência madeira-madeira e a aderência madeira-fibra demonstraram-se satisfatórias. Houve aumento quanto à rigidez das vigas reforçadas e quanto à carga de ruptura das mesmas, com um aumento máximo de 26,25% de carga de ruptura em relação à viga de referência. O modo de ruptura de todas as vigas deu-se por tração, sendo que em apenas uma viga não ocorreu cisalhamento longitudinal e em duas vigas houve esmagamento das lamelas superiores das vigas por compressão. A principal contribuição deste trabalho foi apresentar a viabilidade do uso de fibras de vidro como reforço para vigas de madeira laminada colada.ABSTRACT: The wood has good mechanical properties, but there is a need for improvements to the structural elements meet the demands requested. In this context, it sought this paper was to analyze the use of glass fibers in glued laminated timber beams subjected to simple bending for structural reinforcement, Verifying the increase of stiffness and strength of six laminated wood beams bonded through the adhesive Melamine Urea MUF 1242 with the liquid emulsifier 2542, reinforced with unidirectional fiberglass fabric together with epoxy resin Compound, comparing with a reference beam without reinforcement application, and also analyzing the adhesion between the reinforcement and the surface of the wood and the failure mode of each beam. The wood-wood grip and wood-fiber adhesion proved to be satisfactory. There was an increase in the stiffness of the reinforced beams and in the load of failure of the reinforced beams, with a maximum increase of 26.25% of breaking load in relation to the reference beam. The failure mode of all the beams occurred by traction, and in only one beam did not occur longitudinal shear and in two beams there was crushing of the upper lamellae of the beams by compression. The main contribution of this paper is to present the viability of using glass fibers as reinforcement for glued laminated timber beams.

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Aderência à Madeira de Polímeros Reforçados com Fibras de Carbono sob Temperaturas Elevadas

Cited by 2 publications

References 2 publications

Influence of temperature on the adhesion of fibre reinforced polymers to timber surface

Influence of temperature on the adhesion of fibre reinforced polymers to timber surface

Análise Da Utilização De Fibras De Vidro Em Vigas De Madeira Laminada Colada Submetidas À Flexão Simples

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