Avaliação Preliminar da Qualidade da Madeira de Tectona grandis L. f. Através da Tomografia de Impulso

Amodei, Juliana Bernardo; Oliveira, Bruno Rodrigues de; Gurgel, Monique de Moura; Carvalho, Alexandre Monteiro de; Medeiros, Reginaldo Antônio; Latorraca, João Vicente de Figueiredo

doi:10.4322/floram.2011.016

Cited by 6 publications

(7 citation statements)

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“…From the images that it generates, information of various kinds can be obtained, such as the ratio of heartwood to sapwood, reaction wood and the presence of knots, internal defects and wood rot, among other things, according to Rinntech (2005). Amodei et al (2010) also confirms the application of the technique in the logging industry, allowing the interior of the logs to be visualized and optimizing the location and orientation of the cutting of planks.…”

Section: Introductionsupporting

confidence: 63%

“…For Rinntech (2005), impulse tomography is based on the principle of mechanical wave timing, where the impulse velocity inside the tree is closely correlated with tissue density, the modulus of elasticity and moisture; the purpose is to reconstruct cross sections of trees, generating a mechanical wave velocity graph, also called a tomographic image. Studies of impulse tomography by Nicolotti et al (2003) join those of Martinis et al (2004), Gilbert and Smiley (2004), Pereira (2009), , Amodei et al (2010) and Uliana (2010) in registering good results in comparison with other techniques. It has proved to be an important way of advancing the characterization of wood quality.…”

Section: Conceptual-theoretical Reviewmentioning

confidence: 93%

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Wave Propagation Technology in Non-destructive assays for Wood Qualifying in Tropical Amazon

Barros

Higuchi

Nascimento

et al. 2019

Int J Innov Educ Res

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Non-destructive tests use techniques which allow a body to be evaluated without changing its physical, mechanical and dimensional features and without compromising its future use. Impulse tomography analysis is a non-destructive method which allows a piece of wood to be analyzed by passing mechanical waves through it, allowing researchers to evaluate its qualities in advance and detect the presence of defects. This research reports the assessment of the efficiency of impulse tomography as a technique for identifying defects and the in situ evaluation of tree wood from Amazonian timber species. The data were collected at INPA's Tropical Forestry Experimental Station (ZF-2), located at BR 174, Manaus/AM, in a plot 1 (one) hectare in size, where 7 species were chosen at random. For evaluation, the ARBOTOM pulse tomograph at DAP (diameter at breast height) was used to rapidly capture cross sectional images of the wood. Next, the trees were cut to evaluate cross sections of the wood by eye and samples were taken to determine the density of the wood. The results enabled researchers to detect the presence of distinct zones in the wood by varying the mechanical wave speed indicated by various colour zones revealed in the X-ray. These colour differences are attributable to variations in density related to the different wood substances in the tree. It was found that the wood density and mechanical wave velocity correlated with R² 0.647. The dynamic elastic modulus of the species studied was satisfactory, showing a good degree of resistance. Impulse tomography technique provides complete information and can assist forest managers to make a decision about tree felling that is guided by the assessment of the internal quality of the wood.

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Section: Introductionsupporting

confidence: 63%

Section: Conceptual-theoretical Reviewmentioning

confidence: 93%

Wave Propagation Technology in Non-destructive assays for Wood Qualifying in Tropical Amazon

Barros

Higuchi

Nascimento

et al. 2019

Int J Innov Educ Res

View full text Add to dashboard Cite

show abstract

“…Wave propagation time is strongly correlated with the density of the material, however, the results must be interpreted by a specialist in the area (RINNTECH COMPANY, 2005). Amodei et al (2010) and Pereira et al (2007) and Pereira-Rollo et al (2014) obtained satisfactory results about the quality of wood using the impulse tomography, while Wang and Alison (2008) found areas of decay in the sections analyzed.…”

Section: Introductionmentioning

confidence: 94%

Frequency variation of mechanical waves of the impulse tomograph based on geographic north

Mendes¹,

Filho²

2019

Sci. For.

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“…Alguns autores [2,6,[8][9][10][11]] utilizaram a técnica de ondas de tensão com o único objetivo de obter uma imagem tomográfica da madeira. No trabalho [12] os autores utilizaram o Tomógrafo Acústico para determinar o módulo de elasticidade normal às fibras.…”

Section: Introductionunclassified

Determinação do módulo de elasticidade da madeira em função da inclinação das fibras utilizando tomógrafo acústico

et al. 2018

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RESUMOOs objetivos deste trabalho são determinar, a partir de ensaios não destrutivos, o módulo de elasticidade em função da inclinação das fibras da madeira através de um tomógrafo acústico, comparar e discutir a aplicação de seis critérios de falha adaptados para ensaios não destrutivos e modificar as equações para determinar os critérios de falha mais adequados para o ensaio não destrutivo proposto. Para isto foram ensaiados 6 corpos de prova de 150x15x4 cm de 6 espécies de madeira. Utilizou-se um tomógrafo acústico com oito transdutores. Estes sensores são fixados e excitados mecanicamente com um martelo. Cada vez que um sensor é excitado os outros captam o tempo que a onda mecânica tardou em chegar, logo é determinada a velocidade e calculado o módulo de elasticidade. A inclinação das fibras é determinada a partir dos ângulos formados por cada transdutor em relação a direção destas. Os resultados experimentais foram comparados com seis teorias de critérios de ruptura mecânica. Conclui-se que é possível utilizar o tomógrafo acústico para determinar o mó-dulo de elasticidade inclinado ás fibras, com apenas um ensaio experimental. Todos os seis modelos matemá-ticos avaliados não apresentam significância estatística em seu formato original. Com as modificações feitas nos modelos os que apresentaram significância foram apenas os modelos: hiperbólica, Karlsen e Hankinson, portanto eles são os mais indicados para estimar os valores do módulo de elasticidade dinâmico em função da inclinação das fibras.Palavras-chave: madeira; módulo de elasticidade; ensaios não destrutivos; tomógrafo acústico. ABSTRACTThe objectives of this work are to determine, from non-destructive tests, the modulus of elasticity as a function of the inclination of the wood fibers through an acoustic tomograph, to compare and discuss the application of six fault criteria adapted for non destructive tests and to modify the formulas for to determine the most suitable failure criteria for the proposed non-destructive test. To determine the most suitable failure criteria for the proposed non-destructive test. For this, 6 specimens of 150x15x4 cm of 6 species of wood were tested. An acoustic tomograph with eight transducers was used. These sensors are fixed and mechanically excited with a hammer. Each time a sensor is excited the others capture the time the mechanical wave took to arrive, then the speed is determined and the modulus of elasticity is calculated. The inclination of the fibers is determined from the angles formed by each transducer in relation to the direction thereof. The experimental results were compared with six theories of mechanical rupture criteria. It is concluded that it is possible to use the acoustic tomograph to determine the modulus of elasticity inclined to the fibers, with only one experimental test. All six mathematical models evaluated do not present statistical significance in their original format. With the modifications made in the models those that presented significance were only the models:

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Avaliação Preliminar da Qualidade da Madeira de Tectona grandis L. f. Através da Tomografia de Impulso

Cited by 6 publications

References 1 publication

Wave Propagation Technology in Non-destructive assays for Wood Qualifying in Tropical Amazon

Wave Propagation Technology in Non-destructive assays for Wood Qualifying in Tropical Amazon

Frequency variation of mechanical waves of the impulse tomograph based on geographic north

Determinação do módulo de elasticidade da madeira em função da inclinação das fibras utilizando tomógrafo acústico

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