Grading of construction timeber by ultrasound |
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| Authors: | J L Sandoz |
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| Institution: | (1) EPFL-écublens, CH-1015 Lausanne, Snritrerland |
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| Abstract: | Summary The resistance of spruce beams was characterized with the aid of nondestructive ultrasonic measurements. The modulus of elasticity
and the modulus of rupture in flexure for beams of commercial sized section can be estimated by observing the speed of propagation
of a longitudinal wave applied to the longitudinal axis of the beam. The use of simple ultrasonic equipment and two experimental
transducers (in direct and dry contact) permit measurements to be performed in industry. The technique constitutes the basis
of an objective concept for classification of sawn timber guaranteeing a better reliability and profitability with regard
to the visual grading rules used in Western Europe.
This research was supported by The National Research Fund |
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