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From visual grading and dynamic modulus of European beech (Fagus sylvatica) logs to tensile strength of boards
ID Plos, Mitja (Author), ID Fortuna, Barbara (Author), ID Šuligoj, Tamara (Author), ID Turk, Goran (Author)

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Abstract
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.

Language:English
Keywords:visual grading, machine grading, beech, tension strength, longitudinal vibration, dynamic modulus, hardwood, pregrading, moisture equilibrium, modulus of elasticity
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FGG - Faculty of Civil and Geodetic Engineering
Publication status:Published
Publication version:Version of Record
Year:2022
Number of pages:18 str.
Numbering:Vol. 13, iss. 1, art. 77
PID:20.500.12556/RUL-135497 This link opens in a new window
UDC:539.412:624.011.1
ISSN on article:1999-4907
DOI:10.3390/f13010077 This link opens in a new window
COBISS.SI-ID:92687363 This link opens in a new window
Publication date in RUL:16.03.2022
Views:733
Downloads:112
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Record is a part of a journal

Title:Forests
Shortened title:Forests
Publisher:MDPI
ISSN:1999-4907
COBISS.SI-ID:3872166 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:06.01.2022

Secondary language

Language:Slovenian
Keywords:vizualno razvrščanje, strojno razvrščanje, bukev, natezna trdnost, vzdolžne vibracije, dinamični modul, les listavcev, predrazvrščanje, vlažnostno ravnovesje, modul elastičnosti

Projects

Funder:EC - European Commission
Funding programme:ERA-NET Plus, WoodWisdom-net
Acronym:EU HARDWOODS

Funder:EC - European Commission
Funding programme:FP7
Project number:321573
Name:WoodWisdom-Net+ Pacing Innovation in the Forest-Based Sector
Acronym:WOODWISDOM-NET+

Funder:Other - Other funder or multiple funders
Funding programme:Slovenia, Ministry of Education, Science, and Sport
Acronym:EU HARDWOODS

Funder:EC - European Commission
Funding programme:European Regional Development Fund
Acronym:TIGR4SMART

Funder:Other - Other funder or multiple funders
Funding programme:Slovenia, Ministry of Education, Science, and Sport
Acronym:TIGR4SMART

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