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An Investigation on the Growth Strains and Stresses of
Habibollah Khademi Eslam
Last modified: 2009-09-07
Abstract
Habibollah Khademi Eslam1 Arash Faraj Pour 2
(1) Laboratory of Wood Science and Technology, Science & Research Branch,
Islamic Azad University (IAU), Tehran, Iran
(2) Laboratory of Wood Science and Technology, Science & Research Branch,
Islamic Azad University (IAU), Astara, Iran
Abstract
In order to make an estimation on the amount of the longitudinal and tangential growth strains, 22 trees were selected from two different regional locations in north of Iran. The single-hole strain gauge method was used to measure the percentage of LRSM (longitudinal released strain maturation) and HTR (hygrothermal recovery) of transverse strains. Results showed that a good relationship exists between some environmental conditions and the amount of LRSM. Also, according to the data obtained from lab experiments, the amount of HTR increases by applying heat treatments and shows a good relationship with the increase of temperature at heat treatments. It was found that the increase in release of transverse strains in most of the samples obeyed a similar fashion and it was discovered that the best and optimum heat treatment in order to reach less deformation of wood texture could be in temperatures of around 45°C for Populus deltoides.
(1) Laboratory of Wood Science and Technology, Science & Research Branch,
Islamic Azad University (IAU), Tehran, Iran
(2) Laboratory of Wood Science and Technology, Science & Research Branch,
Islamic Azad University (IAU), Astara, Iran
Abstract
In order to make an estimation on the amount of the longitudinal and tangential growth strains, 22 trees were selected from two different regional locations in north of Iran. The single-hole strain gauge method was used to measure the percentage of LRSM (longitudinal released strain maturation) and HTR (hygrothermal recovery) of transverse strains. Results showed that a good relationship exists between some environmental conditions and the amount of LRSM. Also, according to the data obtained from lab experiments, the amount of HTR increases by applying heat treatments and shows a good relationship with the increase of temperature at heat treatments. It was found that the increase in release of transverse strains in most of the samples obeyed a similar fashion and it was discovered that the best and optimum heat treatment in order to reach less deformation of wood texture could be in temperatures of around 45°C for Populus deltoides.