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Wood Science and Technology

, Volume 41, Issue 5, pp 385–400 | Cite as

Bending characteristics of bamboo (Phyllostachys pubescens) with respect to its fiber–foam composite structure

  • Eiichi ObatayaEmail author
  • Peter Kitin
  • Hidefumi Yamauchi
Original

Abstract

The bending properties of split bamboo culm were compared with those of spruce and beech wood specimens. The bamboo allowed large flexural deformation since its outer layer retains the tensile stress while the softer inner layer undergoes large compressive deformation. The results suggested that the combination of the fiber-rich outer part and the compressible inner part was responsible for the flexural ductility of split bamboo. To clarify the compressible nature of the inner part of bamboo, the longitudinal surfaces of the bamboo and wood specimens were microscopically observed before and after a large longitudinal compression. Although the wood specimens showed serious and localized buckling, the inner part of the bamboo specimens showed no such visible buckling. In the latter case, the foam-like parenchyma cells absorbed the large compressive deformation by their microscopic buckling and simultaneously, the alignment of sclerenchyma fibers was maintained by the surrounding parenchyma matrix. The flexural elasticity of the bamboo was compared to that of the wood in respect of remaining strain during cyclic bending tests. No clear difference was recognized between their remaining strains. This fact indicated that the bamboo was not so flexible elastically, although its fiber–foam combination and intelligent fiber distribution improve flexural ductility.

Keywords

Parenchyma Cell Wood Specimen Localize Buckling Bamboo Fiber Longitudinal Compression 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Eiichi Obataya
    • 1
    Email author
  • Peter Kitin
    • 2
  • Hidefumi Yamauchi
    • 2
  1. 1.Graduate School of Life and Environmental SciencesUniversity of TsukubaIbarakiJapan
  2. 2.Institute of Wood TechnologyAkita Prefectural UniversityNoshiroJapan

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