In order to determine dynamic modulus of elasticity and strength classification of Lithuanian grown Scots pine, comparative a research was made using two non- destructive devices: “Timber Grader MTG” and ultrasonic elasticity and strength meter, developed at Kaunas University of Technology. Pine timber specimens of primary sizes 1011 × 95 × 45 mm, 1011 × 145 × 45 mm and 1011 × 170 × 45 mm were tested. Modulus of elasticity (MOE), natural frequency (NF), time of flight and strength classes was determined. Modulus of elasticity, gained with the ultrasound tester, showed better correlations with density then the ones, measured with the device “Timber Grader MTG”. Moreover, MOE from “Timber Grader MTG” were higher on about 10 % for specimens with width of 95 mm, 8 % for width of 145 mm and 12 % for width of 170 mm then the ones from ultrasound tester for the same specimens’ width. Nevertheless, the correlations between MOE, measured with these two non-destructive methods, are sufficient and fluctuating from 0.46 to 0.69.
Keywords: wood, non-destructive methods, time of flight, modulus of elasticity, strength
Authors
Sveikataite D.
Department of Mechanical Wood Technology, Kaunas University of Technology, Kaunas, Lithuania
Miseikyte S.
Department of Mechanical Wood Technology, Kaunas University of Technology, Kaunas, Lithuania
Baltrusaitis A.
Wood Technology Department, Faculty of Design and Technologies, Kaunas University of Technology, Kaunas, Lithuania
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