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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
Article

Abstract

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.

Keywords

Polymer Microstructure Tensile Strength Composite Material Mechanical Strength 
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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References

  1. 1.
    S. SAHA and S. PAL, “Concise Encyclopaedia of Composite Materials” (Pergamon Press plc., Headington Hill Hall, Oxford OX3 OBW, UK, 1989) p. 243.Google Scholar
  2. 2.
    S. H. LI, S. Y. FU, B.L. ZHOU, Q. Y. ZENG and X. R. BAO, J. Mater. Sci. 29 (1994) 5990.CrossRefGoogle Scholar
  3. 3.
    S. JAIN, U. C. JINDAL and RAKESH KUMAR, ibid. 12 (1993) 558.Google Scholar
  4. 4.
    S. LI, Q. ZENG, Z. ZHENG, F. ZHANG and B. ZHOU, report No. PB94- 208477/XAD, Gov. Res. Announe. Index pp9; ISSN:0097-9007, Publication date 1992 (EMA Journal Announcement: 9504).Google Scholar
  5. 5.
    S. JAIN and R. KUMAR, Mater. Manuf. Process. 9 (1994) 813.Google Scholar
  6. 6.
    S. AMADA, Y. ICHIKAWA, T. MUNEKATA, Y. NAGASE and H. SHIMIZU, Composites Part B 28B (1997) 13.CrossRefGoogle Scholar
  7. 7.
    S. AMADA, Y. ITIKAWA, T. MUNEKATA, Y. NAGASE and A. KIRIGARI, in Proc. 5th Bioengineering Div. Conf., Jpn. Soc. Mech. Engg., 1993, p.62.Google Scholar
  8. 8.
    B. ZHOU, in 6th Workshop on Physics of Materials-frontiers of Advanced Materials, Physics and Technology, Shenyang, Peoples Republic of china, 1992, J. Mater. Sci. & Tech. (China) 9 (1993) 9.Google Scholar
  9. 9.
    QIYUN ZENG, SHIHONG LI, BENLIAN ZHOU and FUHE CAILIO XUEBAO, Acta Materiae Compositae Sinica 10 (1993) 1.Google Scholar
  10. 10.
    S. JAIN, R. KUMAR and U. C. JINDAL, J. Mater. Sci. 27 (1992) 4598.CrossRefGoogle Scholar
  11. 11.
    A. K. RAY, S. K. DAS, S. MANDAL and P. RAMACHANDRARAO, ibid. 39 (2004) 1055.CrossRefGoogle Scholar
  12. 12.
    S. AMADA, Mater. Res. Soc. Bull. 20 (1995) 35.Google Scholar

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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