EFFECT OF HIGH TEMPERATURE AND HIGH HUMIDITY TREATMENT ON BENDING PROPERTIES OF WOOD

Authors

  • Yoshitaka Kubojima
  • Isao Kobayashi
  • Youki Suzuki Forestry and Forest Products Research Institute 1 Matsunosato, Tsukuba, Ibaraki 305-8687
  • Mario Tonosaki Shikoku Research Center Forestry and Forest Products Research Institute Asakura Nishimachi, Kochi 780-8077

Abstract

Japanese cedar (Cryptomeria Japonica D. Don) 110 110 1000-mm green boxed-heart timbers were dried under high temperature (110-140C) and high humidity (0.01-0.24 MPa gauge pressure) conditions until the weight remained unchanged. Then strength properties were examined. Wood became brittle because of the high temperature and high humidity treatment. We hypothesize that the wood was seriously damaged by hydrolysis because of the long treatment time used in this study and that the large cross-sectional area and high set gauge pressure lengthened the time of water loss from the wood. We considered viscosity and plasticity, rather than elasticity, to be the main factors that contributed to the decrease of work for rupture.

Author Biographies

Yoshitaka Kubojima

Researcher

Isao Kobayashi

Researcher

Youki Suzuki, Forestry and Forest Products Research Institute 1 Matsunosato, Tsukuba, Ibaraki 305-8687

Researcher

Mario Tonosaki, Shikoku Research Center Forestry and Forest Products Research Institute Asakura Nishimachi, Kochi 780-8077

Director

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Published

2015-10-19

Issue

Vol. 47 No. 4 (2015)

Section

Research Contributions

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