Interrelations of Wood Physical and Mechanical Properties and Patterns of Their Change within the Birch Stem

Authors

DOI:

https://doi.org/10.37482/0536-1036-2021-6-150-159

Keywords:

birch wood, wood density, compressive strength along the grain, sound velocity, interrelation of physical and mechanical parameters

Abstract

The physical and mechanical properties of standing wood are not constant along the tree height and diameter. They also differ depending on the tree species and conditions of its growth. So, the research purpose is to identify patterns of change and interrelations between the parameters of density, compressive strength and sound propagation velocity along the wood fibers inside the stem of a birch tree growing in the forests of the Middle Volga region of Russia, where such research had never been conducted before. The work was carried out on two sampling areas laid out by standard methods in birch forests of natural origin with average productive capacity on the territory of the Scientific-Experimental Forest District of the Volga State University of Technology in the Mari El Republic. The average age of the birch trees is about 70 yrs, breast height diameter is 30 cm, and height is 28.5 m; 14 sample trees were studied; 0.5 m long chucks were cut out from their stems at a height of 1.3 m from the butt end and at relative heights of 0.25H, 0.5H, and 0.75H. Experimental work was carried out in a laboratory environment with modern technical facilities using standard procedures. Mathematical models describing the changes in the parameters stated above and the interrelations between them with regard to the stem diameter at relative heights were obtained. The research results generally confirmed the findings of other researchers on densitograms and other physical and mechanical properties of wood within the tree stem. However, the features listed above were revealed for birch trees growing under such conditions; in particular, it concerns the ratio of strength and density, as well as the wood strength and the velocity of sound propagation through the fibers. The results obtained have both scientific and practical value as a basis for the development of a non-destructive method for predicting technical properties of standing wood as well as timber for producing assortments for special purposes.
For citation: Fedyukov V.I., Chernov V.Yu., Chernova M.S., Tsoy O.V. Interrelations of Wood Physical and Mechanical Properties and Patterns of Their Change within the Birch Stem. Lesnoy Zhurnal [Russian Forestry Journal], 2021, no. 6, pp. 150–159. DOI: 10.37482/0536-1036-2021-6-150-159

Funding: The research was supported by the Ministry of Science and Higher Education of the Russian Federation (Grant No. 075-15-2021-674) and the Core Facility Centre “Ecology, Biotechnology, and Processes for Producing Environmentally Friendly Energy Carriers” of the Volga State University of Technology, Yoshkar-Ola.

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Author Biographies

В. И. Федюков, Volga State University of Technology

Doctor of Engineering, Prof.; ResearcherID:ABC-7222-2021

В. Ю. Чернов, Volga State University of Technology

Doctor of Engineering, Prof.; ResearcherID: X-4439-2019

М. С. Чернова, Volga State University of Technology

Postgraduate Student; ResearcherID: X-4073-2019

О. В. Цой, Volga State University of Technology

External PhD Student; ResearcherID: ABC-7278-2021

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Published

2021-12-09

How to Cite

Федюков, В. И., В. Ю. Чернов, М. С. Чернова, and О. В. Цой. “Interrelations of Wood Physical and Mechanical Properties and Patterns of Their Change Within the Birch Stem”. Lesnoy Zhurnal (Forestry Journal), no. 6, Dec. 2021, pp. 150-9, doi:10.37482/0536-1036-2021-6-150-159.

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MECHANICAL TECHNOLOGY OF WOOD AND WOOD SCIENCE

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