Effect of wood properties on within-tree variation in ultrasonic wave velocity in softwood

The radial variations in the velocity of longitudinal waves propagating through Japanese cedar and Japanese cypress were experimentally investigated. In addition, the tracheid length (TL), microfibril angle (MFA), air-dried density (AD), and moisture content (MC) were measured in order to determine...

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Bibliographic Details
Published in:Ultrasonics 2011-04, Vol.51 (3), p.296-302
Main Authors: Hasegawa, Masumi, Takata, Masato, Matsumura, Junji, Oda, Kazuyuki
Format: Article
Language:English
Subjects:
Applied sciences
Bark
Cedar
Correlation
Density
Exact sciences and technology
Longitudinal waves
Microfibril angle
Moisture content
Polymer industry, paints, wood
Softwood
Softwoods
Tracheid length
Trunks
Ultrasonic wave velocity
Within-tree variation
Wood
Wood. Paper. Non wovens
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Summary:The radial variations in the velocity of longitudinal waves propagating through Japanese cedar and Japanese cypress were experimentally investigated. In addition, the tracheid length (TL), microfibril angle (MFA), air-dried density (AD), and moisture content (MC) were measured in order to determine the effect of wood properties on velocity variations within the wood trunk. For both species, the longitudinal wave velocities measured in the longitudinal direction ( V L) exhibited minimum values near the pith. For Japanese cedar, V L increased from 3600 m/s toward the bark and soon attained a constant value (=4500 m/s). On the other hand, for Japanese cypress, V L kept increasing from 4000 m/s near the pith to 4800 m/s at the bark. These radial variations in V L coincided with those in the tracheid length. V L exhibited strong correlations with TL and MFA with a significant level of ( p < 0.01). These findings suggest that the TL and MFA greatly affect the radial variation in the ultrasonic wave velocity in softwood.
ISSN:0041-624X
1874-9968
DOI:10.1016/j.ultras.2010.10.001