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Mechanical Behaviour of Wood Compressed in Radial Direction: Part II. Influence of Temperature and Moisture Content

  • Fund Project:

    This work was founded by a grant from the Natural Sciences and Engineering Research Council of Canada and New Brunswick Innovation Foundation. Their support is acknowledged greatly.

  • This study investigated the influence of temperature and moisture content on the mechanical properties of wood compressed in radial direction. Jack pine (Pinus banksiana) and balsam poplar (Populus balsamifera) specimens were tested under a combination of temperature (20 ℃, 55 ℃, 90 ℃, and 125 ℃) and moisture content (2%, 7%, 12%, and 17%). The yield stress (σy) and modulus of elasticity (MOE) of the specimens were determined from the stress- strain response. It was found that an increase in either temperature or moisture content of wood generally caused a decrease in the mechanical properties for both species. The t-test results revealed that jack pine specimens are more sensitive to changes in temperature and moisture content than balsam poplar. For jack pine specimens, at any of the temperatures, the moisture content of 12% was found to be a crucial level to start a significant decrease in σy and MOE, while at any of the moisture content, a change in temperature from 55 ℃ to 90 ℃ exhibited a significant change in σyand MOE. The regression models developed can be used to predict σyand MOE as a function of temperature and moisture content.
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Mechanical Behaviour of Wood Compressed in Radial Direction: Part II. Influence of Temperature and Moisture Content

  • a Wood Science & Technology Centre, University of New Brunswick, Fredericton, NB, E3C 2G6;
  • b Department of Civil & Environmental Engineering, University of Alberta, Edmonton, AB, T6G 1H9;
  • c Faculty of Forestry & Environmental Management, University of New Brunswick, Fredericton, NB, E3B 5A3
Fund Project:  This work was founded by a grant from the Natural Sciences and Engineering Research Council of Canada and New Brunswick Innovation Foundation. Their support is acknowledged greatly.

Abstract: This study investigated the influence of temperature and moisture content on the mechanical properties of wood compressed in radial direction. Jack pine (Pinus banksiana) and balsam poplar (Populus balsamifera) specimens were tested under a combination of temperature (20 ℃, 55 ℃, 90 ℃, and 125 ℃) and moisture content (2%, 7%, 12%, and 17%). The yield stress (σy) and modulus of elasticity (MOE) of the specimens were determined from the stress- strain response. It was found that an increase in either temperature or moisture content of wood generally caused a decrease in the mechanical properties for both species. The t-test results revealed that jack pine specimens are more sensitive to changes in temperature and moisture content than balsam poplar. For jack pine specimens, at any of the temperatures, the moisture content of 12% was found to be a crucial level to start a significant decrease in σy and MOE, while at any of the moisture content, a change in temperature from 55 ℃ to 90 ℃ exhibited a significant change in σyand MOE. The regression models developed can be used to predict σyand MOE as a function of temperature and moisture content.

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