Elastic constants for wood by an ultrasonic method

Bucur, Voïchita; Archer, Robert R.

doi:10.1007/bf00353361

Cited by 130 publications

(125 citation statements)

References 2 publications

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“…For the CL sample, the dynamic MOE values for both devices used were lower than those from the static test. The natural vibration frequency of the sample is highly related to its dimensions, namely to the length, so that longer beam has lower natural frequency (Bucur 1984). The lower frequency causes the decrease of dynamic MOE (Ouis 2002).…”

Section: Resultsmentioning

confidence: 99%

Comparison of Non-Destructive Methods Based on Natural Frequency for Determining the Modulus of Elasticity of Cupressus lusitanica and Populus x canadensis

et al. 2016

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A non-destructive method for measurement of the modulus of elasticity (MOE) was compared with the static method on beams of Cupressus lusitanica and Populus x canadensis. The dynamic method is based on the principle of the resonance frequency, using longitudinal vibrations (Timber Grader MTG, accelerometer) and the static method for measurement of the flexural modulus of elasticity is according to EN 408 (2012). The differences between the ascertained dynamic and static MOE values were 1.1% to 2.4% for the Populus x canadensis sample and 12.7% to 15.5% for the Cupressus lusitanica sample. Furthermore, the correlation dependence of the applied methods was determined and the regression equations are shown. Experimental measurement showed the effect of the knot clusters, which appeared primarily in Cupressus lusitanica samples and considerably impacted the resultant values.

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Section: Resultsmentioning

confidence: 99%

Comparison of Non-Destructive Methods Based on Natural Frequency for Determining the Modulus of Elasticity of Cupressus lusitanica and Populus x canadensis

et al. 2016

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“…It is used to estimate the modulus of elasticity according to the following equation: MOE US = V 2 US ρ 10 -6 [4,5,13,31] where V US is the ultrasound propagation speed in the longitudinal direction, in metres per second (m s -1 ), ρ is the wood density [27], in kilograms per cubic metre (kg m -3 ) and MOE US , the modulus of elasticity in longitudinal direction, in megapascals (MPa).…”

Section: Ultrasound Methods By Means Of the Sylvatestmentioning

confidence: 99%

Relative efficiency of alternative methods to evaluate wood stiffness in the frame of hybrid larch (Larix�נeurolepis Henry) clonal selection

2004

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-This study compares the efficiency of 3 indirect techniques that evaluate Young's modulus all along the sawing leading to the production of normalised specimens of hybrid larch trees from a clonal test. Ultrasonic speed is demonstrated as an interesting method for clone classification regarding Young's modulus in a clonal selection programme, whatever the sawing stage. However, the quality of results is reduced with standing tree measurements. The use of both the Pilodyn and resonance frequency measures is confirmed as a possibility.

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“…Indeed, beech wood has the advantages to be a quite homogeneous, orthotropic and already well characterized, allowing the comparison of our results with those from the literature [1,3,12]. The determination of the material symmetry thanks to the tomography of a sphere led to a 20.91 × 21.06 × 21.11 mm 3 cubic shaped specimen.…”

Section: Resultsmentioning

confidence: 66%

“…However, the development of fast measurement techniques is important to increase the number of available data for a relevant statistical analysis. Fast measurements can be obtained by using different techniques based on ultrasonic (or acoustic) wave propagations in direct contact [3,4] or in a coupling medium (e.g., water) with a protective coating if dry wood properties have to be measured [5,6]. These techniques allow the determination of the diagonal terms of the elastic tensor on a unique parallelepipedic sample [7] but, except in some cases with a polyhedral [8] or spherical samples [6,9], they usually require other samples, and/or coupling with other kind of measurements, for the determination of off-diagonal terms [10,11,12,13,14].…”

Section: Introductionmentioning

confidence: 99%

Wood elastic characterization from a single sample by resonant ultrasound spectroscopy

et al. 2012

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The goal of this paper is to propose an experimental method allowing the identification of the complete elastic tensor of anisotropic biological materials such as wood using only one sample. To do so, two complementary methods are used. First, the wood eigen-directions are defined from a sample of spherical shape that is then cut into a cube in a way to perform resonant ultrasound spectroscopy (RUS). The method is successfully applied on a reference beech sample with known orthotropic directions. A comparison of the identified elastic constants with those from the literature and some inferred from ultrasonic transmission measurements is given.

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Elastic constants for wood by an ultrasonic method

Cited by 130 publications

References 2 publications

Comparison of Non-Destructive Methods Based on Natural Frequency for Determining the Modulus of Elasticity of Cupressus lusitanica and Populus x canadensis

Comparison of Non-Destructive Methods Based on Natural Frequency for Determining the Modulus of Elasticity of Cupressus lusitanica and Populus x canadensis

Relative efficiency of alternative methods to evaluate wood stiffness in the frame of hybrid larch (Larix�נeurolepis Henry) clonal selection

Wood elastic characterization from a single sample by resonant ultrasound spectroscopy

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