Bending characteristics of bamboo (<Emphasis Type="Italic">Phyllostachys pubescens</Emphasis>) with respect to its fiber–foam composite structure |
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Authors: | Eiichi Obataya Peter Kitin Hidefumi Yamauchi |
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Institution: | (1) Graduate School of Life and Environmental Sciences, University of Tsukuba, Ibaraki 305-8572, Japan;(2) Institute of Wood Technology, Akita Prefectural University, Noshiro 016-0876, Akita, Japan |
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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. |
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