20.500.12556/RUL-135497 From visual grading and dynamic modulus of European beech (Fagus sylvatica) logs to tensile strength of boards The aim of the present paper is to assess the non-destructive indicating properties of Slovenian beech (Fagus sylvatica) logs and correlate them with the mechanical properties of the final product, which is boards. Beech logs were visually graded according to the standard procedure and vibrational frequencies were measured. Logs were further on sawn into boards which were also non-destructively tested in wet and dry conditions. Finally, the boards were experimentally tested in tension. Special focus was directed towards visual parameters of the beech logs and their influence on the overall quality of the output material. The longitudinal natural frequencies of the logs were studied as potential indicating properties. The results showed that a majority of the visual log grading parameters do not result in good quality timber in terms of strength and stiffness properties, and only few are decisive for the final classification. The coefficient of determination of the static MOE vs. dynamic MOE of logs was r$^2$ = 0.13, whereas vs. the MOE of wet boards was r$^2$ = 0.49. Using a few visual characteristics in combination with dynamic measurements of logs and of wet boards could help to increase the yield of high quality beech wood. visual grading machine grading beech tension strength longitudinal vibration dynamic modulus hardwood pregrading moisture equilibrium modulus of elasticity vizualno razvrščanje strojno razvrščanje bukev natezna trdnost vzdolžne vibracije dinamični modul les listavcev predrazvrščanje vlažnostno ravnovesje modul elastičnosti true false true Angleški jezik Slovenski jezik Članek v reviji 2022-03-16 15:31:41 2022-03-16 15:31:43 2022-09-14 04:13:38 0000-00-00 00:00:00 2022 0 0 18 str. iss. 1, art. 77 Vol. 13 Jan. 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 539.412:624.011.1 1999-4907 10.3390/f13010077 92687363 RAZ_Plos_Mitja_2022.pdf RAZ_Plos_Mitja_2022.pdf 1 F52F07AB83BB2DD099A544FFCB297482 ee500c01ff3c82c8a38517ee788c89ae1bb98727855e2d1367e173289ff533d1 21f6557b-a536-11ec-8556-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=154605 https://www.mdpi.com/1999-4907/13/01/77 1 cbcf5bae-a535-11ec-8556-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=154604 Fakulteta za gradbeništvo in geodezijo 0 0 0