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1994 Fiscal Year Final Research Report Summary

Thermal behavior at wood and composite wood surfaces

Research Project

Project/Area Number 05452321
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 林産学
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

SADOH Takeshi  Kyoto Univ., Faculty of Agr., Professor, 農学部, 教授 (00026494)

Co-Investigator(Kenkyū-buntansha) NAKAMURA Masashi  Kyoto Univ., Faculty of Agr., Instructure, 農学部, 助手 (10227936)
MASUDA Minoru  Kyoto Univ., Faculty of Agr., Associate Professor, 農学部, 助教授 (40027165)
Project Period (FY) 1993 – 1994
KeywordsWood / Wood composite / Surface / Thermal behavior / Fiber orientation / Density / Knot / Defect
Research Abstract

The end surfaces absorbed 1.2 times more heat than did these of edge-grained surfaces when the surfaces are irradiated with incandescent lamps. The rate of surface temperature rise for various wood and composite wood with various colors and densities was determined when they were irradiated with incandescent lamps.
Thermal behavior at a boundary between human skin and wood composites was simulated. The thermal transfer model based on numerical method with finite differences was proposed to analyze the changes in temperature and rate of heat transfer at the interfeaces. The model was valuable to estimate the sensory warmth felt by man's palm in conact with the wood surface.
The thermogaphic method was applied to detect the knots, using with a difference in thermal properties of knot from the surrounding tissues for softwood species. The lumber surface was radiated with incandescent lamps and the rate of change in surface temperature was measured. As the results the rate of temprature rise was the lowest on the knot, follwed by distored grain region. From the thermograph at 60s after commencement of heating it has been found that the knot sizes could be detected.
Heat is generated according to the energy loss of hysteresis loops which is obs erved at stress-strain curves of defect portions. Cracks and some kinds of defects could be detected by chermal images with repeated bending.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 佐道 健: "皮膚/木質材料界面における熱挙動のシミュレーション" 材料. 42. 157-161 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 佐道 健: "材面での温度分布画像を用いた節の検出" 木材学会誌. 39. 13-18 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 村田功二: "木材表面の熱吸収に及ぼす表面色および繊維の潜り角の影響" 木材学会誌. 40. 1131-1133 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 村田功二: "節を含む針葉樹表層での熱伝導と熱吸収" 木材学会誌. 40. 1180-1184 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takeshi, SADOH: "Detection of knots in hinoki and karamatsu lumber by thermography." Mokuzai Gakkaishi. Vol.39 (1). 13-18 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takeshi, SADOH: "Computer simulation of thermal behavior at human skin-woody material interfaces." J.Society of Materials Science Japan. Vol.42 (473). 157-161 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Koji, MURATA: "Effect of colors and diving angles of fibers on thermal absorption by wood surfaces." Mokuzai Gakkaishi. Vol.40 (10). 1131-1133 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Koji, MURATA: "Heat absorptionm and transfer in softwoods and their knot surfaces." Mokuzai Gakkaishi. Vol.40 (11). 1180-1184 (1994)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1996-04-15  

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