The Relation of Fibre Length and Ray Dimensions to Sound Propagation velocity in wood of selected Tropical Hardwoods

Baar, Jan; Tippner, Jan; Gryc, Vladimír

doi:10.1163/22941932-00000005

Cited by 11 publications

(8 citation statements)

References 17 publications

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“…There are different reports about the relationship between FL and acoustic velocity in hardwood species. Similar to the results presented in this study, Baar et al (2013) reported a low correlation (r = 0,45) between FL of wenge (Millettia laurentii) De Wild and ultrasound velocity. In contrast, Van Duong et al (2019) obtained a moderate relationship (r = 0,69) for chinaberry tree (Melia azedarach L.) wood, while Polge (1984) reported a higher relationship (r = 0,90) for cherry wood.…”

Section: Sd Is Standard Deviation; CV Is the Coefficient Of Variationsupporting

confidence: 90%

Relationship between acoustic wave velocity and mechanical properties in Acacia mangium wood

Van Duong,

Hasegawa

2024

Maderas-Cienc Tecnol

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There is a strong interest in developing and using acoustic technology to evaluate the mechanical properties of wood in situations where a static bending test is not feasible to undertake. In this study, the mechanical properties of Acacia mangium (black wattle) wood were predicted by using stress wave and ultrasonic wave methods. The values of dynamic modulus of elasticity based on stress wave and ultrasonic wave were 9,29 % and 4,75 % higher than those obtained from static modulus of elasticity, respectively. There was no statistically significant correlation between acoustic velocity and mechanical properties measured by destructive tests. The strong experimental correlation coefficients were found between stress wave and modulus of elasticity (r = 0,94; P < 0,001), and ultrasonic wave and modulus of elasticity (r = 0,83; P < 0,001). This result indicates that stress wave and ultrasonic wave techniques are suitable for predicting the static modulus of elasticity of Acacia mangium (black wattle) wood if the density of the measured elements is known. There was no dependence of wood density and acoustic propagation velocity measured in this study, whereas statistically significant correlations were found between the fiber length with stress wave velocity (r = 0,44; P < 0,05) and ultrasonic velocity (r = 0,48; P < 0,05).

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Section: Sd Is Standard Deviation; CV Is the Coefficient Of Variationsupporting

confidence: 90%

Relationship between acoustic wave velocity and mechanical properties in Acacia mangium wood

Van Duong,

Hasegawa

2024

Maderas-Cienc Tecnol

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“…It can be explained by several reasons. The acoustic wave velocity can be affected by the moisture content, temperature, grain orientation, density, decay, and also geometry (Beall 2002) and by the length of fibers and ray dimensions (Baar et al 2013). The difference in velocity can be caused by a different anatomical structure of spruce and oak (Saadat-Nia et al 2011).…”

Section: Resultsmentioning

confidence: 99%

Determination of Correlation between Destructive and Nondestructive Test Methods Applied on Modified Wood Exposed to Natural Weathering

Oberhofnerová¹,

Arnetová²,

Holeček³

et al. 2016

BioResources

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The objective of this study was to determine a correlation between the dynamic modulus of elasticity (MOEd) and the static modulus of elasticity (MOEs), and to assess the potential of using nondestructive (NDT) methods as a grading tool for both treated and untreated wood exposed to weathering. In the experiment, test samples made from spruce and oak were exposed for four months to natural weathering. Half of the specimens were treated with a silicon-based nano-protection. The MOEd was determined using acoustic NDT methods-ultrasound transmission (MOEdu) and the vibration methods (MOEdv), while the MOEs was determined by a destructive three-point bending test. The results showed that there was no statistical significance for the influence of the time of exposure and the surface treatment on the modulus of elasticity. The ultrasound method, measured in the longest distance of the sample, had the most significant correlation with the MOEs. The vibration method also reached a similar correlation with the MOEs. The mean values of the MOEdu and MOEdv were higher than the MOEs. The influence of density on the acoustic wave velocity was not confirmed.

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“…In hard woods, the longitudinal elements oriented parallel to the axial direction provide strength for the tree as well as a continuous path for wave propagation. The indispensable role of fibre length in acoustic behaviour of wood has been reported by various researchers (Feeney 1987;Hasegawa et al 2011;Baar et al 2013). However, in radial and tangential directions, the lack of continuous path was observed similarly in longitudinal directions, making a kind of stop banding for wave movement.…”

Section: Discussionmentioning

confidence: 77%

Investigation on transversal variation of poplar tension wood quality using ultrasound wave parameters

Saadatnia¹,

Enayati

Pourtahmasi

et al. 2014

Wood Material Science & Engineering

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Transversal variations of some ultrasound wave parameters (phase velocity, group velocity, attenuation coefficient and acoustic radiation) were measured from the pith to the bark of poplar tension wood discs in different orthotropic directions. Over 80 cubic specimens of 2 × 2 × 10 cm 3 (radial, tangential and longitudinal, respectively) were prepared and tested acoustically. Samples containing tension woods were separated from normal ones using anatomical experiments. Results showed acoustical behaviour of normal and tension wood improved in longitudinal direction while the distance between pith and bark increased; also, wave parameter variations were less important in radial and tangential directions. In addition, phase velocity and acoustic radiation -which significantly varied -were the best parameters for quality assessment of poplar wood compared with group velocity and attenuation coefficients. Since samples near the bark were acoustically better than counterparts near the pith, they could be used in products requiring more strength, like lumber. Finally, acoustic radiation and phase velocity were correlated more strongly with density than group velocity and attenuation.

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The Relation of Fibre Length and Ray Dimensions to Sound Propagation velocity in wood of selected Tropical Hardwoods

Cited by 11 publications

References 17 publications

Relationship between acoustic wave velocity and mechanical properties in Acacia mangium wood

Relationship between acoustic wave velocity and mechanical properties in Acacia mangium wood

Determination of Correlation between Destructive and Nondestructive Test Methods Applied on Modified Wood Exposed to Natural Weathering

Investigation on transversal variation of poplar tension wood quality using ultrasound wave parameters

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