S.-Y. S.-Y.Wang, C.-J. Lin, C.-M. Chiu
The Adjusted Dynamic Modulus of Elasticity Above the Fiber Saturation Point in Taiwania Plantation Wood by Ultrasonic-Wave Measurement
Summary
In this study, the effects of moisture content and bulk density on the ultrasonic velocity of Taiwania
(Taiwania cryptomerioides Hay.) plantation wood in the longitudinal and radial directions are investigated.
The dynamic modulus of elasticity is adjusted above the fiber saturation point by a simple
method. It was observed that ultrasonic velocity tended to increase with a decrease in moisture
content, and the effect of moisture content on the ultrasonic speed below the fiber saturation point
was stronger than that above. Moreover, for this species ultrasonic speed in the longitudinal direction
decreased with increasing bulk density, while that in the radial direction increased. The correlations
between ultrasonic velocity, moisture and bulk density could be represented by a polynomial
regression model. The K value for ultrasonic wave was affected by density. The adjusted
dynamic modulus of elasticity remained fairly constant above the fiber saturation point using this
simple method. Therefore, the results obtained by the ultrasonic-wave technique should be adjusted
before estimating some physical properties of standing trees.
Holzforschung, Walter de Gruyter
Print ISSN: 0018-3830
Volume: 57, 08/2003
Pages: 547 - 552
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