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Doświadczalna analiza wpływu wilgotności na parametry mechaniczne drewna iglastego

Habyk Dominika, Goździewska Marlena, Kiełbratowski Janusz, Ryncewicz Krzysztof

Builder

2023

R.27, nr 9

11--15

W artykule przedstawiono wyniki badań, których celem była ocena wpływu wilgotności wybranych gatunków drewna iglastego na wytrzymałość na zginanie oraz ściskanie wzdłuż i w poprzek włókien, a także wpływ na moduł sprężystości podłużnej przy zginaniu. W każdej próbie przebadano po 12 próbek w stanie suchym oraz po 12 próbek po zawilgoceniu dla drewna sosnowego i świerkowego. W toku przeprowadzonych badań stwierdzono zarówno spadki wytrzymałości w kolejnych próbach, jak i spadki modułu Younga przy zginaniu. Odnotowano też zmianę charakteru zniszczenia próbek w zależności od wilgotności.

The article presents the results of research aimed at evaluating the influence of moisture of selected coniferous wood species on bending strength and compression along and across the grain, as well as the effect on Young's modulus during bending. In each test, 12 dry samples and 12 wet samples were tested for two types of wood: pine and spruce. In the course of the tests, decreases in both strength in subsequent tests as well as decreases in Young's modulus during bending were found. It was also found that the nature of the destruction of the samples changed depending on the humidity.

Wood density in European larch (Larix decidua Mill.) from selected provenances grown at the Siemianice Forest Experimental Station

Szaban Jarosław, Kowalkowski Wojciech, Łacka Agnieszka, Karaszewski Zbigniew

Drewno : prace naukowe, doniesienia, komunikaty

2021

vol. 64, nr 207

27--41

The purpose of this study was to determine variation in the density of wood from different provenances, growing under the same soil and climate conditions. Samples were obtained from an experimental site located at the Siemianice Forest Experimental Station. We analyzed larch wood samples from trees aged 48 years, collected from six different provenances in Poland. Diameter at breast height (DBH) and tree height were used to calculate the parameters for sample trees, from which a 70 cm segment was cut, from breast height upwards (up to 2 m of tree height). Samples with dimensions 20 × 20 × 30 mm were obtained from the material. Sample volume was determined by stereometry. Relative density was determined for 890 samples. The highest wood density was found in trees from Czerniejewo, and the lowest in trees from Rawa Mazowiecka. Analysis of variance, including the mean wood density values of trees, did not demonstrate significant differences between provenances in terms of this characteristic. Mean relative density was higher in larch wood samples from the heartwood zone. The density of samples cut closer to the bark was lower, as the value was affected by the large content of sapwood. A relation was found between the provenances from which the study material was sourced and the relative density of wood.