Vibrational properties of wetwood of todomatsu (<Emphasis Type="Italic">Abies sachalinensis</Emphasis>) at high temperature |
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| Authors: | Hisashi Ohsaki Yoshitaka Kubojima Mario Tonosaki Masamitsu Ohta |
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| Institution: | (1) Hokkaido Forest Products Research Institute, 1-10 Nishikagura, Asahikawa 071-0198, Japan;(2) Forestry and Forest Products Research Institute, Tsukuba Norin Kenkyu Danchi-nai, Ibaraki 305-8687, Japan;(3) Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan |
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| Abstract: | The object of this study was to understand precisely the drying characteristics of wetwood of todomatsu (Abies sachalinensis Mast.). For this purpose, the vibrational properties of wetwood of todomatsu at high temperature were compared with those
of normal parts that had lower green moisture content than the wetwood. Specimens were cut respectively from the wetwood and
normal parts, and matched in the radial direction. The specimens and the measuring systems were placed in an electric drying
oven and free-free vibration tests were conducted in the oven under absolutely dry conditions. The wetwood and the normal
parts were tested separately. The temperature was raised from room temperature to 200°C and then lowered to 50°C in steps
of 25°C. The specific Young’s modulus decreased with an increase in temperature during the heating process while it increased
with the decreasing temperature during the cooling process. There was no significant difference in the specific Young’s modulus
between the wetwood and the normal part at all tested temperatures. The loss tangent took a minimum value at about 100°C in
both the heating and cooling processes. There was no significant difference in the loss tangent between the wetwood and the
normal part. Thus, the elastic and viscoelastic behaviors of the wetwood appear to be similar to those of the normal part
in the temperature range of an actual kiln-drying process. |
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| Keywords: | Wetwood Japanese fir Vibrational properties High-temperature drying |
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