Small Roundwood Grading by Non Destructive X-Rays and Ultrasonic Waves Methods
G. Adjanohoun ; J-L. Guillot; J-D. Lanvin ; R. Cholat
ABSTRACT Some new NDE techniques have been used and developed in CTBA for grading small round wood of French Douglas specie. The methodology is used to evaluate their mechanical characteristics by both X-rays and Sylva-test. The results are discussed. They show that it is possible to define directly geometric dimensions, local density of clear wood, Knot Volume Ratio (KVR) along the piece and young modulus values. The KVR curve allows to find the higher value for nodosity, to assess the distance between whorls and to measure the mean quantity of knots on various zones. The clear wood density curve gives an estimation of the mean value of clear wood density and the general density curve give the whole density of the piece. The predicted critical defect has been found in the piece for any considered test, and a better correlation between destructive evaluation and NDE techniques is obtained.
Publication Source: WCTE '98 - 5th World Conference on Timber Engineering, 1998 August 17-20, Montreaux, Switzerland.
Vol. 1, Pages 684.....
Publisher: Presses polytechniques et universitaires romandes - [Homepage]
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