Quantificação da falha na madeira em juntas coladas utilizando técnicas de visão artificial

Abrahão, Christovão Pereira; Varella, Carlos Alberto Alves; Pinto, Francisco de Assis de Carvalho; Khoury, Joseph

doi:10.1590/s0100-67622003000100010

Cited by 5 publications

(1 citation statement)

References 4 publications

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“…As faces a serem unidas tiveram o acabamento aplainado (Figura 28), pois uma superfície rugosa pode aumentar a adesão na junta colada (PIZZI, 1994), por haver uma maior a penetração do adesivo nas paredes das células da madeira (entre as microfibrilas) (TSOUMIS, 1991). O adesivo e a correta adesão das lâminas são os fatores mais importantes para a boa qualidade de viga laminada colada (CARRASCO, 1984, ABRAHÃO, 2003. Verificando-se que houve uma considerável variabilidade nos resultados dos ensaios de cisalhamento optou-se, dessa forma, por aprofundarem-se os estudos na ligação madeira-cola no sentido de compreender variáveis importantes da adesão e contribuir para a melhoria da eficiência da viga laminada colada.…”

Section: Desenvolvimento De Um Equipamento Destinado a Manter Os Corpos-de-prova Sob Influência Simultânea De Pressão E Temperaturaunclassified

Estudo do tempo de adesão, da temperatura e da pressão de colagem na tensão limite de cisalhamento de uniões de madeira de >i<Eucalyptus grandis>/i< coladas com adesivo sem solvente

Melotto¹

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Study of adhesion time, temperature and gluing pressure on shear strength of Eucalyptus grandis wood glued with adhesive solvent freeThe use of glu-lam is a viable alternative for exploitation of all wood potential presenting a series of advantages. The linking between layers however has a basic paper in glu-lam good quality. Therefore for a good performance of glu-lam structures it is fundamental the choice of an adhesive which has a great mechanics resistance and also resistance to the weather action. The adhesives usually used having high cost, that arrives 60% of glu-lam total cost beyond contain solvent that are harmful to health, having dark coloration what changes the wood natural color. Low cost is primordial to become this material more viable and competitive if compared with another materials. Thus, this search had as objective to verify the load capacity applied in the samples in shear strength test right in the glued surface and also contributing for efficiency improvement of beam-glu-lam. The glue used to prepare the samples was free of solvent. It were verified the effect of gluing pressure (1,25; 2,50 e 5,00 MPa), temperature (27, 60 e 90°C) and the adhesive time of cure (7 and 10 days)in the shear strength. The adhesive dose applied in the layers was 200g/cm².In a second research step it were obtained the specific gravity and moisture content from the samples which were already tested to explain the variability that was observed. It was utilized Eucalyptus grandis wood for being a specie of enormous potential for multi purpose and because its physical and mechanical properties make it. Highest values of shear strength were obtained at the temperature of 90°C. The glue pressure and the adhesive curing time have no relevant influence on this important mechanical properties.

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Section: Desenvolvimento De Um Equipamento Destinado a Manter Os Corpos-de-prova Sob Influência Simultânea De Pressão E Temperaturaunclassified

Estudo do tempo de adesão, da temperatura e da pressão de colagem na tensão limite de cisalhamento de uniões de madeira de >i<Eucalyptus grandis>/i< coladas com adesivo sem solvente

Melotto¹

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Digital image processing in the determination of glued wood joints behavior

Maffioletti,

Ramalho,

Paes

et al. 2024

International Journal of Adhesion and Adhesives

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Analysis of Surface Finishing and Pressing Time in Wooden Pieces for the Use of Wood Waste in the Furniture Industry

Gutiérrez¹,

Angel²,

Kiperstok³

et al. 2019

Forest Products Journal

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This article analyzes the behavior of surface finish and pressing time in glued pieces of eucalyptus wood. The importance of the study lies in verifying the influence of two variables (surface finish and pressing time) on the gluing of wood pieces for the furniture industry over time. For this purpose, the quality of adhesion of Eucalyptus urograndis wood pieces with polyvinyl acetate adhesive and the behavior of the wood to shear in the glue line are evaluated. It was necessary to produce test specimens according to the ABNT-NBR 7190 standard; three different surface finishes were evaluated on the faces to be adhered and three different cold pressing times, a variable that has not been analyzed in previous studies. It was possible to determine the shear resistance in the glue line and also to observe the percentage of wood failure when performing the destructive test on the test specimen 1 year after being glued. The highest shear strength was obtained for test specimens without surface finish and with a pressing time of 24 hours. With the results obtained in this study, the optimal surface finish and pressing time to be used in the furniture industry is evidenced.

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Quantificação da falha na madeira em juntas coladas utilizando técnicas de visão artificial

Cited by 5 publications

References 4 publications

Estudo do tempo de adesão, da temperatura e da pressão de colagem na tensão limite de cisalhamento de uniões de madeira de >i<Eucalyptus grandis>/i< coladas com adesivo sem solvente

Estudo do tempo de adesão, da temperatura e da pressão de colagem na tensão limite de cisalhamento de uniões de madeira de >i<Eucalyptus grandis>/i< coladas com adesivo sem solvente

Digital image processing in the determination of glued wood joints behavior

Analysis of Surface Finishing and Pressing Time in Wooden Pieces for the Use of Wood Waste in the Furniture Industry

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