Journal of Materials Science

, Volume 42, Issue 15, pp 5964–5972 | Cite as

Epoxy composites with 200 nm thick alumina platelets as reinforcements

  • Dharmendra Kumar Shukla
  • Venkitanarayanan Parameswaran


Composites were prepared by dispersing Alumina platelets of polygonal shape having a thickness of 200 nm and size of 5–10 μm in epoxy (LY 556) matrix using sonication. Good dispersion of the platelets was observed through scanning electron microscopy (SEM). The quasi-static plane-strain fracture toughness and tensile properties of the composites were determined for platelet volume fraction varying from 0% to 10%. The results indicated that addition of the platelets give considerable improvement in fracture toughness and good improvement in the elastic modulus of epoxy. For 10% volume fraction of the platelets, the fracture toughness improved by 110% where as the improvement in elastic modulus was 78%. However there was an associated reduction of 53% in tensile strength and 73% in failure strain. SEM of fractured surface was carried out to understand the various mechanisms responsible for the improvement in fracture toughness. By appropriately accounting for the orientation and stacking effects of the platelets, the applicability of predictive models, such as the Halpin-Tsai and Mori-Tanaka, for estimating the composite modulus is demonstrated.


Elastic Modulus Fracture Toughness Crack Front High Volume Fraction Failure Strain 



The authors acknowledge the financial support of Aeronautical Research and Development Board, India (ARDB/AE/19990054) and Ministry of Human Resource Development, India (MHRD-ME-TAT-20030334). We also acknowledge Department of Science and Technology, India (DST/INT/US-NSF/RPO-159/04) for the financial support under the INDO-US collaboration program.


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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Dharmendra Kumar Shukla
    • 1
  • Venkitanarayanan Parameswaran
    • 1
  1. 1.Department of Mechanical EngineeringIndian Institute of Technology KanpurKanpurIndia

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