Journal of Materials Science

, Volume 40, Issue 19, pp 5249–5253 | Cite as

Bamboo—A functionally graded composite-correlation between microstructure and mechanical strength

  • A. K. RayEmail author
  • S. Mondal
  • S. K. Das
  • P. Ramachandrarao


Bamboo is supposed to be one of the best functionally gradient composite materials available. In a piece of bamboo, not only the number of fibres (‘vascular bundles’) but also the fibre quality varies from outer to inner-most periphery. It has been observed that near the outer periphery, within 1 mm2 area, the number of fibres is approximately 8 whereas the same at the inner-most periphery is approximately 2. Again the cross-sectional shape of fibre at outer periphery is almost circular (diameter 0.14 mm) and compacted but at the inner-most periphery, a fibre (diameter of major axis 0.93 × diameter of minor axis 0.78 mm) has been sprayed, and contain matrix in it. This structural behaviour causes the variation of tensile strength, e.g., the strength of a fibre at the outer periphery is about 160 kg/mm2 and the same at the inner-most periphery is only 45 kg/mm2. It has also been observed that the matrix of bamboo can preferentially be removed from the fibre by alkali treatment. 10% NaOH can remove adhered matrix with little effect on fibres while 20% or stronger alkali reduces the strength of fibre.


Polymer Microstructure Tensile Strength Composite Material Mechanical Strength 
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Copyright information

© Springer Science + Business Media, Inc. 2005

Authors and Affiliations

  • A. K. Ray
    • 1
    Email author
  • S. Mondal
    • 1
  • S. K. Das
    • 1
  • P. Ramachandrarao
    • 2
  1. 1.National Metallurgical LaboratoryJamshedpurIndia
  2. 2.Banaras Hindu UniversityVaranasiIndia

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