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Effect of Notch Root Radius on the Fracture Toughness of Epoxy and 0.5 wt% Amino MWCNTs-Reinforced Nanocomposite

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Abstract

Significantly improved fracture toughness can be imparted by introducing amino multi-walled carbon nanotubes to neat epoxy resin. The present work reports on the fracture toughness evaluation of neat epoxy resin and its nanocomposite. Both the materials with varied finite notch root radii ρ, (in the range of 110–750 µm) are subjected to mode-I (tensile) fracture. The study reveals that the critical notch root radius (below which the apparent fracture toughness KIQ does not vary with ρ) of neat epoxy is 340 µm and the same for nanocomposite is 300 µm.

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Acknowledgments

The authors would like to thank Shri Anil Kumar and Dr I. Srikanth of Advanced Systems Laboratory, DRDO for their help in providing facilities for material processing and testing. We would also like to thankfully acknowledge the reviewers for their valuable comments on text of a manuscript and many useful suggestions.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Vignan Institute of Technology and Science, Deshmukhi, Hyderabad, 508 284, India

    K. Chandra Shekar

  2. Department of Mechanical Engineering, Jawaharlal Nehru Technological University College of Engineering, Hyderabad, 500 085, India

    B. Anjaneya Prasad

  3. Regional Centre for Military Airworthiness (Materials), CEMILAC, DRDO, PO Kanchanbagh, Hyderabad, 500 058, India

    N. Eswara Prasad

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  1. K. Chandra Shekar
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  2. B. Anjaneya Prasad
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  3. N. Eswara Prasad
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Correspondence to K. Chandra Shekar.

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Chandra Shekar, K., Anjaneya Prasad, B. & Eswara Prasad, N. Effect of Notch Root Radius on the Fracture Toughness of Epoxy and 0.5 wt% Amino MWCNTs-Reinforced Nanocomposite. Trans Indian Inst Met 69, 1069–1075 (2016). https://doi.org/10.1007/s12666-015-0623-8

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  • DOI: https://doi.org/10.1007/s12666-015-0623-8

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