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Journal of Wood Science

Official Journal of the Japan Wood Research Society

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Cooling set and its recovery in water-saturated bamboo under large bending deformation

Journal of Wood Science volume 55, pages 100–106 (2009)Cite this article

Abstract

To clarify the bending properties and cooling set for bamboo under large deformation, the relationship between applied deflection and residual deflection was investigated, and comparison was made with the results of thermal recovery and anatomical changes due to deformation. No clear effect of initial deflection on set measured after a long time was found for wood and bamboo loaded on the epidermis side (Bepi). On the other hand, set for bamboo loaded on the endodermis side (Bendo) increased with deformation level. Recovery from the deformation with time for Bendo was almost complete at around 1000 min after unloading in the three-point bending method. This recovery behavior was not seen for Bepi or wood. It was considered that no failure was caused in the bent specimen, because most of the deformation was completely recovered by reheating to the temperature at which the specimens were deformed before cooling. The recovery from deformation for Bendo loaded by the four-point bending method continued even after 1000 min. From microscopic observations, shearing deformations were seen for Bendo loaded by the three-point bending method. From these results, it can be considered that shearing deformations between the two loaded points effectively contribute to decreased recovery force from deformations for Bendo.

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Authors and Affiliations

  1. Research Division of Agriculture, Graduate School of Kyoto Prefectural University, 1-5 Shimogamo-hangicho, Sakyo-ku, Kyoto, 606-8522, Japan

    Masamitsu Nakajima & Yutaka Ishimaru

  2. Research Division of Life and Environmental Sciences, Graduate School of Kyoto Prefectural University, Kyoto, 606-8522, Japan

    Yuzo Furuta & Makoto Ohkoshi

Authors
  1. Masamitsu Nakajima
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  2. Yuzo Furuta
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  3. Yutaka Ishimaru
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  4. Makoto Ohkoshi
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Corresponding author

Correspondence to Masamitsu Nakajima.

Additional information

Part of this report was presented at the 54th Annual Meeting of the Japan Wood Research Society in Sapporo, August 2004

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Nakajima, M., Furuta, Y., Ishimaru, Y. et al. Cooling set and its recovery in water-saturated bamboo under large bending deformation. J Wood Sci 55, 100–106 (2009). https://doi.org/10.1007/s10086-008-1002-4

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  • DOI: https://doi.org/10.1007/s10086-008-1002-4

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