Monitoramento do teor de umidade de madeiras de &lt;i&gt;Pinus elliottii&lt;/i&gt; Engelm. e &lt;i&gt;Eucalyptus grandis&lt;/i&gt; W. Hill ex Maiden, sob diferentes temperaturas de secagem, através do ultra-som.

Calegari, Leandro; Stangerlin, Diego Martins; Santini, Élio José; Haselein, Clóvis Roberto; Longhi, Solon Jonas; Carmo, Paulo Inácio Obregon do; Filho, Luiz Carlos Pinto da Silva; Gatto, Darci Alberto

doi:10.5902/198050981971

Cited by 13 publications

(3 citation statements)

References 3 publications

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“…The average values of the wave propagation speed in the samples along the length were similar to the values related by other researchers, such as Ballarin & Nogueira (2005), Calegari et al (2007) and Stangerlin et al (2008), ranging from 4.000 to 6.000 m s -1 . The dynamic modulus of elasticity did not change as the specific density and the ultrasonic speed (although these are directly related).…”

Section: Resultssupporting

confidence: 87%

Ultrasonic method for estimation of modulus of elasticity of Eucalyptus grandis wood

Missio¹,

Gatto²,

Modes³

et al. 2013

Agraria

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This study aimed to verify the relation between the modulus of elasticity of Eucalyptus grandis W. Hill ex Maiden wood obtained from destructive testing of static bending and from non-destructive testing by ultrasound, both after thermal rectification. A total of 85 samples, with dimensions of 2.5 x 2.5 x 41.0 cm (thickness, width and length), were made from eucalyptus planks. These samples, as well as those without thermal rectification (control), were subjected to two heat treatments, called Combination and Kiln, and then evaluated. In the combination treatment, the wood was subjected to thermal treatment in an autoclave at 130 ± 3 °C and a pressure of 0.2 MPa for 3 h and, after a conditioning period, to heat in a kiln at 160 ± 1 °C for the same length of time, whereas the other treatment consisted of only thermal rectification in a kiln. The main results showed a moderate relation between destructive and non-destructive methods, with the best results recorded in the samples without thermal rectification. With the continuous improvement of the non-destructive techniques, the ultrasound is confirmed as a viable method to obtain values of the modulus of elasticity as a function of the dynamic modulus of elasticity.Key words: non-destructive method, thermal rectification, ultrasound Método ultrassonoro para estimativa do módulo de elasticidade de madeiras de Eucalyptus grandis RESUMOEste trabalho teve por objetivo verificar a correlação entre o módulo de elasticidade da madeira de Eucalyptus grandis W. Hill ex Maiden, obtido por ensaios destrutivo de flexão estática e não destrutivos com ultrassom, após tratamento térmico. Foram confeccionadas 85 amostras das pranchas de eucalipto com dimensões de 2,5 x 2,5 x 41,0 cm (espessura, largura e comprimento). Avaliaram-se amostras submetidas a dois tratamentos térmicos denominados Combinação e Estufa, além daqueles sem tratamento térmico (Controle). No tratamento combinado as madeiras foram submetidas à termorretificação em autoclave a 130 ± 3 °C e pressão de 0,2 MPa por 3 h e, após um período de condicionamento, submetidas ao calor em estufa a 160 ± 1 °C, pelo mesmo período; já o outro tratamento consistiu apenas na termorretificação em estufa. Com base no estudo realizado foram encontrados resultados com relação moderada entre os métodos destrutivo e não destrutivo, sendo os melhores deles registrados nas amostras que não sofreram tratamentos térmicos. Com o aperfeiçoamento constante das técnicas não destrutiva o ultrassom é um método viável para obtenção de valores de módulo de elasticidade estático em função do módulo de elasticidade dinâmico.Palavras-chave: método não destrutivo, termorretificação, ultrassom

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Section: Resultssupporting

confidence: 87%

Ultrasonic method for estimation of modulus of elasticity of Eucalyptus grandis wood

Missio¹,

Gatto²,

Modes³

et al. 2013

Agraria

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“…Some authors observed higher speed of sound propagation in woods with longer fibers, bearing thicker walls and higher density (Bucur 1988;Feeney et al 1998;Bucur et al, 2002;Oliveira & Sales 2006). Higher densities with lower values of speed of sound propagation were also described (Lucchi 1986;Calegari et al 2007). On the other hand, Wegst (2006) reported high speeds in both woods with high density such as Caesalpinia echinata and Manilkara sp.…”

Section: S P E C I E S ----------------------------------------------mentioning

confidence: 94%

The Potential of Ipê (Handroanthus SPP.) and Maçaranduba (Manilkara SPP.) Woods in the manufacture of bows for string instruments

Longui¹,

Yojo²,

Lombardi³

et al. 2010

IAWA J

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While the wood Caesalpinia echinata (pernambuco wood) is traditionally used in the manufacture of bows for string instruments, wood of other genera such as Handroanthus (syn. Tabebuia) and Manilkara are also used in bow making, but still on a very small scale. This study aims to evaluate the anatomical, chemical, physical, mechanical, and acoustic characteristics of these two latter woods, establishing their potential for bow making. Length, frequency of vessel elements and rays, and the higher percentage of fibers influence the density, modulus of elasticity, modulus of rupture, and the speed of sound propagation, whereas the content of lignin influence the sticks’ stiffness. It appears that Handroanthus bows can provide quality equivalent to that of pernambuco wood. Despite its appropriate heartwood color and texture, Manilkara provides bows of inferior quality.

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“…This signal is recovered by another crystal and then amplified and transformed into electrical pulses again to measure the propagation time. Thus, having the distance and the travel time of the wave, its velocity is obtained (CALEGARI et al, 2007;COSSOLINO;PEREIRA, 2010).…”

Section: Ultrasoundmentioning

confidence: 99%

The use of non-destructive testing methods on glued laminated wood to obtain data

Mastela¹,

Segundinho²,

Gonçalves³

et al. 2023

A Look at Development

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Glued laminated wood is a mechanically processed wood product that requires strict quality control. Non-destructive evaluation can be employed on an industrial scale to improve the quality control process, allowing greater uniformity of raw materials and their by-products. The quality in the manufacture and the structural performance of elements in MLC can be guaranteed by the performance of tests, which have the function of characterizing the physical and mechanical properties of the parts. This work aims to present the main non-destructive methods used by glued laminated wood (MLC) to obtain data. The study presents the visual classification and non-destructive methods used for structural classification, including static flexion, machine stress rating (MSR), impulse excitation method, stress wave, and ultrasound. It is concluded that the choice of the method to be used in the mechanical characterization should be based on the knowledge of the advantages and disadvantages of each one, in line with the definition of the one that best suits the needs, the technique, and the cost of acquisition and maintenance.

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Monitoramento do teor de umidade de madeiras de <i>Pinus elliottii</i> Engelm. e <i>Eucalyptus grandis</i> W. Hill ex Maiden, sob diferentes temperaturas de secagem, através do ultra-som.

Cited by 13 publications

References 3 publications

Ultrasonic method for estimation of modulus of elasticity of Eucalyptus grandis wood

Ultrasonic method for estimation of modulus of elasticity of Eucalyptus grandis wood

The Potential of Ipê (Handroanthus SPP.) and Maçaranduba (Manilkara SPP.) Woods in the manufacture of bows for string instruments

The use of non-destructive testing methods on glued laminated wood to obtain data

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