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Title: サーモグラフィ装置を用いた木材の横圧縮変形時の温度測定
Other Titles: Temperature Measurement during Deformation by Lateral Compression of Wood Using a Thermography Device
Authors: 栗山, 欣悟  KAKEN_name
澤田, 豊  kyouindb  KAKEN_id
藤井, 義久  KAKEN_name
奥村, 正悟  KAKEN_name
Author's alias: Kuriyama, Kingo
Sawada, Yutaka
Fujii, Yoshihisa
Okumura, Shogo
Keywords: サーモグラフイ
lateral compression of wood
plastic deformation
thermal energy
finite element method
Issue Date: 10-Dec-2002
Publisher: 京都大学大学院農学研究科附属演習林
Journal title: 森林研究 = Forest research, Kyoto
Volume: 74
Start page: 149
End page: 157
Abstract: ヒノキの気乾材を横圧縮した時の変形と温度上昇の関係を検討するため, サーモグラフィ装置を用いて表面温度の測定を行い, 変形に要した仕事に対する試料に蓄えられた熱エネルギーの割合を計算した.その結果, 変形仕事の約24~28%が熱エネルギーに変換されていることが分かった.また, 圧縮後の試料の自然及び強制回復における回復率を調べたところ, 熱水で回復させた場合は元の寸法の約90%以上まで回復した.さらに, 試験中の試料からの熱流出の影響を検討するため, 解析式と有限要素法を用いて試料温度を計算した結果, 解析式からは表面の温度が約1.91℃上昇したとき, 中心部では2.13~2.25℃の温度上昇があること, 有限要素法の結果から推定した熱エネルギーへの変換割合は45~52%になる事などが分かった.
In order to examine the relationship between deformation and temperature rise during lateral compression of air-dried wood specimen of hinoki, surface temperature was measured using a thermography device, and was calculated the ratio of work of deformation to thermal energy accumulated in a specimen. The thermal energy was estimated to be 24-28% of the work of deformation. Compressed specimens recovered in height to about 90% of its original dimension after immersion in boiling water. Furthermore, the analysis on the effect of thermal dissipation to surroundings on the surface temperature of specimen during the experiment showed that the temperature rise in center part was higher by 0.22-0.34℃ than that on the surface. From finite element method (FEM) analysis, the thermal energy generated in specimens was estimated to be 45-52% of the work of deformation.
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