Nondestructive Evaluation of Green Dimension Lumber Using Stress Wave and Transverse Vibration Techniques

Halabe, Udaya B.; Bidigalu, Gangadhar M.; GangaRao, Hota V. S.; Ross, Robert

doi:10.1007/978-1-4613-0383-1_247

Cited by 42 publications

(50 citation statements)

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“…The modulus of elasticity values obtained using nondestruc-tive testing methods were usually higher than those from the static test. This is because wood is a visco-elastic and highly impact-adsorbent material (Halabe et al 1997). Concerning the wood vibration characteristics, the restored elastic force is proportional to the displacement, and the dissipative force is proportional to the velocity.…”

Section: Dynamic and Static Properties Of Specimensmentioning

confidence: 99%

Application of Nondestructive Methods to Evaluate Mechanical Properties of 32-Year-Old Taiwan Incense Cedar (Calocedrus formosana) Wood

2012

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The objective of this work was to assess the physical and mechanical properties of standing Taiwan incense cedar (Calocedrus formosana) using nondestructive techniques (NDT). In addition, the relationship between characteristics of standing trees and wood properties was established. Results indicated that the velocity values and bending properties decreased as tree height increased. In addition, velocity values of specimens were greater than those of logs and standing trees. After regressive analysis, the correlation coefficients (r) were 0.79 for standing trees and logs and 0.70 for logs and specimens. Not only the velocities measured by ultrasonic wave (V u ), tap tone (V f ), and vibration (V t ) methods, but dynamic MOE also correlated well with the static bending properties of specimens. In addition, the values of dynamic and static MOE showed the following trend: DMOE u > DMOE f > DMOE t > MOE. For all specimens, the r values were found to be 0.92 for MOE and DMOE t , and 0.75 for MOR and DMOE t . Therefore, it was assumed that the nondestructive testing methods can provide basic information about standing trees and specimens for future management practices and utilization of Taiwan incense cedar.

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Section: Dynamic and Static Properties Of Specimensmentioning

confidence: 99%

Application of Nondestructive Methods to Evaluate Mechanical Properties of 32-Year-Old Taiwan Incense Cedar (Calocedrus formosana) Wood

2012

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“…If any cross-sectional weakening exists in the measured object, it can be obviously mapped on the PC screen. The principle of stress wave testing is based on differences in the velocity of stress waves propagating in different materials, since the velocity of sound in healthy wood is much higher than in voids or in decaying wood (Halabe et al 1997;Wang et al 2004;Feng and Li 2008). Several studies of this technology have been performed, both experimentally and with simulations (Kiernan 2009).…”

Section: Fig 1 Example Of An Ancient Chinese Timber Frame Buildingmentioning

confidence: 99%

Prediction of Internal Defect Area in Wooden Components by Stress Wave Velocity Analysis

Dai

Qian

et al. 2015

BioResources

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In this study, wooden components torn down from ancient buildings were used as the experimental materials. With methodology based on reverse simulation testing, some artificial holes making up different proportional areas of their cross-section were chiseled and tested with a six-sensorpoint stress wave testing device. The results indicated that twodimensional analog images could be used to judge the internal defects of wooden components qualitatively but did not provide quantitative, accurate determination. By comparing and contrasting the attenuation tendency of stress wave velocities among adjacent sensor points, separated sensor points, and diagonal sensor points, the defect grade of wooden components can be classified. Six variations were chosen as discriminant factors. These were the attenuation coefficients of the stress wave velocities via three propagation paths and the relative proportions of their absolute values. The Mahalanobis distance discrimination model was adopted for the in-grade estimation of the internal defects present in the component's cross-section. This method had high operability and no misjudgment ratio.

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“…Todavia, alguns autores, como Halabe et al (1997) e Souza et al (2011, apontaram a potencialidade de uso desse parâmetro na predição das propriedades de madeiras ou compostos de madeira.…”

Section: Propriedades Mecânicasunclassified

Estimativas das propriedades de compostos LVL produzidos com paricá (Schizolobium amazonicum Huber ex Ducke) por meio de stress wave

Melo

Menezzi

2014

Rev. Árvore

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RESUMO -Foram avaliadas as propriedades físicas e mecânicas de compósitos LVL produzidos com a madeira de paricá (Schizolobium amazonicum Huber ex. Ducke), por meio de Stress Wave Timer. Os compósitos foram confeccionados em laboratório, dos quais foram retiradas amostras, que foram inicialmente destinadas à realização dos ensaios não destrutivos. Todas as amostras, com dimensões de 2,2 × 2,2 × 40 cm, foram ensaiadas, não destrutivamente, com a propagação de ondas nos sentidos flatwise e edgewise. Em sequência, as mesmas amostras foram destinadas à confecção de subamostras, para realização dos ensaios destrutivos, físicos (absorção de água, inchamento em espessura e inchamento residual) e mecânicos (resistência e rigidez à flexão estática flatwise; resistência e rigidez à flexão estática edgewise; resistência à compressão paralela e resistência ao cisalhamento paralelo e perpendicular). A velocidade de propagação das ondas (V0) e o módulo de elasticidade dinâmico (E md ), obtidos com o auxílio do Stress Wave, foram utilizados para elaboração de modelos de predição das propriedades avaliadas. Os resultados indicaram que o Stress Wave Timer apresenta resultados satisfatórios para predição das propriedades mecânicas de compósitos LVL. Com relação às propriedades físicas, embora tenham sido verificados modelos com ajustes significativos, constatou-se limitação dessa ferramenta para predição desses parâmetros. Contudo, considerando ambas as propriedades, físicas e mecânicas, os melhores ajustes foram observados em amostras ensaiadas com a propagação de ondas no sentido edgewise e com o uso da variável independente E md .Palavras-chave: Ondas de tensão; Propriedades físico-mecânicas; Compósitos estruturais de madeira. PREDICTION OF THE PROPERTIES OFLVL PRODUCED WITH PARICÁ (Schizolobium amazonicum Huber exDucke) BYMEANS OF STRESS WAVE METHOD ABSTRACT -The physical and mechanical properties of the LVL manufactured with paricá (Schizolobium

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Nondestructive Evaluation of Green Dimension Lumber Using Stress Wave and Transverse Vibration Techniques

Cited by 42 publications

References 0 publications

Application of Nondestructive Methods to Evaluate Mechanical Properties of 32-Year-Old Taiwan Incense Cedar (Calocedrus formosana) Wood

Application of Nondestructive Methods to Evaluate Mechanical Properties of 32-Year-Old Taiwan Incense Cedar (Calocedrus formosana) Wood

Prediction of Internal Defect Area in Wooden Components by Stress Wave Velocity Analysis

Estimativas das propriedades de compostos LVL produzidos com paricá (Schizolobium amazonicum Huber ex Ducke) por meio de stress wave

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