ULRASONIC WAVE PROPAGATION AND YOUNGS MODULUS OF ELASTICITY ALONG THE GRAIN OF SCOTS PINE WOOD (PINUS SYLVESTRIS L.) VARYING WITH DISTANCE FROM THE PITH

Wood density, ultrasonic wave velocity and Young’s modulus along the grain of Scots pine wood ( Pinus sylvestris L.) were determined in five zones of a tree trunk cross-section differing in their distance from the pith. The microfibril angle (MFA) in the tangential walls of tracheids and the Young’s modulus of cell walls were estimated. The microfibril angle was found to be the main determinant of the ultrasonic wave velocity and Young’s modulus of wood along the grain.

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