Acoustoelastic Phenomena of Wood
Yasutoshi Sasaki and Kosei Ando
Faculty of Agricultural Sciences, Nagoya University
Nagoya 464-8601, Japan
ABSTRACT The velocity changes of ultrasonic waves propagating transverse to the direction of applied stress in wood were investigated experimentally. Additionally, bending stress distributions in wood beam specimen were estimated by measuring ultrasonic velocity, that is, by the acoustoelastic method. The investigation showed that the ultrasonic waves change speed a little due to the applied stress. The percentage change in the ultrasonic velocity was given as a function of the applied stress, and the acoustoelastic constants were obtained. The velocity change depended on the species, ultrasonic modes, and the applied stresses. Bending stress distribution estimated by the acoustoelastic technique agreed well with the stress values obtained by strain gauge method and mechanical calculation. The acoustoelastic phenomena can be applied to determine stress conditions of wood.
Publication Source: WCTE '98 - 5th World Conference on Timber Engineering, 1998 August 17-20, Montreaux, Switzerland.
Vol. 2, Pages 296.....
Publisher: Presses polytechniques et universitaires romandes - [Homepage]
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