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Tensile properties and fracture behaviour of carbon fibre filament materials

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Abstract

Monotonic tensile properties and fracture behaviour of carbon fibre filament materials, namely single/mono- and multi-filaments (two and four filaments) as well as virgin carbon tows have been evaluated and discussed. Micro composite or single fibre approach is used in this study, which facilitated the evaluation of tensile properties and nature of fracture of carbon filament materials in a relatively short time with a large number of inexpensive trials. Tensile tests have been conducted on these filament materials at ambient temperature and laboratory air atmosphere. Load–elongation and the corresponding stress–strain plots thus obtained have been analysed to understand the tensile behaviour. The peak tensile strength of single carbon filament is found to be 3.8 GPa, and the value of the resilience obtained is 19 MJ/m3. The peak tensile strength was found to increase moderately with further increase in number of filaments. However, the value of resilience was found to increase with increase in the number of fibres, which is attributed to the controlled failure of multi-filaments. On the other hand, the tensile strength of virgin carbon tow without matrix was found to be 1.13 GPa, and the value of the fracture energy was determined to be 9.9 MJ/m3, which is nearly one fourth or even less than the corresponding values of the mono- and multi-filaments. The data obtained in the case of the virgin carbon tows were further analysed to evaluate the Weibull statistical parameters.

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Acknowledgements

The authors are indebted to Dr. AM Srirama Murty and Dr. G Malakondaiah, former and present Directors, respectively, Defence Metallurgical Research Laboratory (DMRL) for their constant encouragement, and kind permission to publish this article. The authors express their grateful thanks to Dr. M Srinivas and Dr. Vikas Kumar of DMRL for many useful suggestions. The authors are also grateful to Smt. G Rohini Devi, Scientist, Advanced Systems Laboratory, Hyderabad for the provision of the facilities to conduct some of the experiments for this study. Funding from DRDO is gratefully acknowledged.

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  1. S. Nithya

    Present address: Department of Mechanical and Industrial Engineering, Concordia University, Montreal, H3G 2W1, Canada

Authors and Affiliations

  1. Defence Metallurgical Research Laboratory, PO Kanchanbagh, Hyderabad, 500 058, India

    Sweety Kumari & J. Subrahmanyam

  2. Advanced Systems Laboratory, PO Kanchanbagh, Hyderabad, 500 058, India

    N. Padmavathi

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

    N. Eswara Prasad

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  1. Sweety Kumari
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  2. S. Nithya
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  3. N. Padmavathi
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  4. N. Eswara Prasad
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  5. J. Subrahmanyam
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Correspondence to N. Eswara Prasad.

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Kumari, S., Nithya, S., Padmavathi, N. et al. Tensile properties and fracture behaviour of carbon fibre filament materials. J Mater Sci 45, 192–200 (2010). https://doi.org/10.1007/s10853-009-3916-7

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  • DOI: https://doi.org/10.1007/s10853-009-3916-7

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