Ultrasonic characterization of solid and laminated wood of Fagus crenata
DOI:
https://doi.org/10.54167/tch.v18i3.1636Keywords:
ultrasound velocity, dynamic modulus, melamine-urea formaldehyde, wood density, small specimensAbstract
The objective of the research was to determine the density, ultrasound velocity, and dynamic modulus of solid and laminated Fagus crenata wood. Measurements of ultrasound speed were taken at nine positions in the radial direction and three in the tangential and longitudinal directions on six solid wood samples and six laminated samples using melamine-urea formaldehyde resin as the adhesive. A completely randomized experiment was designed. The density of laminated wood experienced an 18 % increase compared to solid wood. The lamination of F. crenata wood increases both the speed and the dynamic modulus of the laminated wood in the radial direction by 70 % and in the longitudinal direction by 1 %, while it decreases in the tangential direction by 19 %. The wood lamination process reduces the natural variability of ultrasound speed by 2 % and the dynamic modulus by 5 %. The results of the research are limited by the use of small-sized specimens. It is advisable to conduct experiments with similar specimens to the actual dimensions in the field for the engineering calculation of structural elements.
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