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Issue 9 (1) 2010 pp. 35-43

Waldemar Moliński, Edward Roszyk

Poznań University of Life Sciences

RESTRICTION OF SWELLING OF WOOD SUBJECTED TO BENDING STRESS AND MOISTENING IN THE COMPRESSED ZONE

Keywords: mechano-sorptive creep, swelling pressure, beech wood, bending, asymmetric moistening
Abstract:

The study was undertaken to show the possibility of wood swelling pressure determination on the basis of the time course of its mechano-sorptive creep induced by bending stress of different values and simultaneous moistening of the compressed zone.The creep was induced in the conditions of three-point bending of beech wood (Fagus sylvatica L.). The bending pressure applied in the radial direction was of the magnitude of 0.05, 0.1 and 0.15 of the mean destroying stress determined for the samples of moisture content of about 7%. Immediately after application of loading the samples were subjected to asymmetric moistening in the zone of compressive stress. For the sake of comparison also the free sorptive deformation of analogous samples was observed. On the basis of the linear relations between the deformation (recorded at specific time intervals during the process of mechano-sorptive creep) and the bending stress applied, it was possible to determine the values of the stress at which the samples would remain in the non-deformed state despite their asymmetric moistening. The maximum swelling pressure determined in this way is by about 50% greater than that found in the direct way.

pub/.pdf Full text available in english in Adobe Acrobat format:
http://www.forestry.actapol.net/pub/4_1_2010.pdf

For citation:

MLA Moliński, Waldemar, and Edward Roszyk. "Restriction of swelling of wood subjected to bending stress and moistening in the compressed zone." Acta Sci.Pol. Silv. 9.1 (2010): 35-43.
APA Moliński W., Roszyk E. (2010). Restriction of swelling of wood subjected to bending stress and moistening in the compressed zone. Acta Sci.Pol. Silv. 9 (1), 35-43
ISO 690 MOLIńSKI, Waldemar, ROSZYK, Edward. Restriction of swelling of wood subjected to bending stress and moistening in the compressed zone. Acta Sci.Pol. Silv., 2010, 9.1: 35-43.
Streszczenie w języku polskim:
http://www.forestry.actapol.net/tom9/zeszyt1/streszczenie-4.html