Evaluation of the Accuracy of Wood Drilling Resistance Measurement Method in Dendrochronological Studies. P. 135–150

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UDС

674.038.1:620.179.1

DOI:

10.37482/0536-1036-2023-5-135-150

Abstract

One of the promising methods for determining physical and mechanical properties and structure of wood is the method based on the measurement of drilling resistance. Limitations of application of the method of measuring drilling resistance in dendrochronological studies are related to a number of factors that have a significant impact on the accuracy of determining the variation of physical and mechanical properties of wood within annual layers: the depth of drilling, its direction relative to the fibers, and the speed parameters of the drilling process. In order to assess the accuracy of measuring the radial growth of pine wood (Pinus sylvestris L.) with moisture content of 6–8 %, the ResistYX device and standard thin drill bits were used. On the basis of comparative analysis of radial wood growth determined by the optical method and the method of measuring resistance to drilling, it was found that in order to obtain accurate data on growth with a correlation coefficient greater than 0.7, it is recommended to measure no more than 17 annual layers on one sample, which corresponds to an average total width of annual layers of 36.6 mm. The influence of the main reasons for the decrease in the accuracy of radial growth determination by the drilling resistance measurement method was studied: geometrical parameters of the cutting part of a thin drill bit, deviation of the drilling direction from the specified one, impossibility of precise determination of the strictly radial drilling direction, wood flaws, as well as friction of the drill shank when the drilling depth increases. To increase the accuracy of the method of measuring drilling resistance in dendrochronological studies it is proposed to develop a method including the use of a special or newly developed tool for more accurate determination of the core and radial drilling of wood or round timber; to increase the rigidity of the thin drill bit; to provide the required fixation of the thin drill bit during its initial contact with wood and inside the device. Further studies in this direction will be associated with the assessment of measuring accuracy for the radial growth of coniferous wood by the feeding force for drill bit penetration.

Authors

Vasilii Yu. Chernov*, Candidate of Engineering, Assoc. Prof.;
ResearcherID: X-4439-2019, ORCID: https://orcid.org/0000-0001-9496-7340
Evgenii S. Sharapov, Doctor of Engineering, Assoc. Prof.; ResearcherID: B-8151-2014, ORCID: https://orcid.org/0000-0002-6500-5377
Ilschat G. Gaisin, Candidate of Engineering, Assoc. Prof.; ORCID: https://orcid.org/0000-0002-3707-1342

Affiliation

Volga State University of Technology, Lenina pl., 3, Yoshkar-Ola, 424000, Russian Federation; chernovvy@volgatech.net, SharapovES@volgatech.net, GaisinIG@volgatech.net

Keywords

annual layers of wood, dendrochronological studies, drilling resistance profile, optical method, thin drill bit, measurement accuracy, drilling resistance measurement method, ResistYX

Funding

The research was supported by the Ministry of Science and Higher Education of the Russian Federation (Grant № 075-15-2021-674/3) and Core Facility Centre «Ecology, biotechnologies and processes for obtaining environmentally friendly energy carriers» of the Volga State University of Technology, Yoshkar-Ola and by the Russian Science Foundation grant No. 22-79-00098, https://rscf.ru/project/22-79-00098/.

For citation

Chernov V.Yu., Sharapov E.S., Gaisin I.G. Evaluation of the Accuracy of Wood Drilling Resistance Measurement Method in Dendrochronological Studies. Lesnoy Zhurnal = Russian Forestry Journal, 2023, no. 5, pp. 135–150. (In Russ.). https://doi.org/10.37482/0536-1036-2023-5-135-150

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