Автор: Panayot Panayotov

Статии

COMPETITIVE ANALYSIS OF MECHANICAL PROPERTIES OF THERMALLY MODIFIED WOOD PRODUCED IN SUNFLOWER OIL

Автори: Panayot Panayotov, Zhivko Georgiev, Vasil Merdzhanov

Резюме

Thermally modification processes change mechanical properties of wood. These changes depend on the temperature treatment. In this article are reported mechanical properties changes in spruce, beech and poplar wood, modified in temperature 200 °C sunflower oil. It is determined: density, bending strength, compressive strength on fiber direction, sharing strength on fiber direction, splitting strength on received wood according to BDS 16987:89. About comparison are studied mechanical properties of untreated samples. It is proven that the modified wood in sunflower oil has lower density and lower bending strength in parallel comparing with untreated wood.

Ключови думи: thermally modified wood, mechanical properties, beech-, spruce-, poplar- wood

EN Version

CORRELATION BETWEEN PHYSICAL AND MECHANICAL PROPERTIES OF THE WOOD

Автори: Todor Petkov, Panayot Panayotov

Резюме

The results of testing for the presence of correlation and how strong it is between some physical – mechanical properties - bending strength, modulus of elasticity in bending and density are established. This analysis compared the coefficients of correlation between one or more pairs of variables in order to determine statistical correlations between them. The results reflect the behavior of the test specimens made from the wood of various tree species common in Bulgaria – white pine, spruce, black pine, beech and oak.

Ключови думи: correlation coefficient, physical - mechanical properties of wood

EN Version