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First principles study of breaking energy and mechanical strength of Kevlar-29

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Abstract

The first principles study is performed for the mechanical strength of Kevlar-29, and is based on density functional theory. The bond strength is investigated relative to the displacement of central nitrogen atom along X, Y and Z directions, respectively. The structural property analysis explains the asymmetric nature. A higher bond breaking energy is observed during compression along Z direction and vice versa for elongation. It is an insulator of forbidden energy gap which increases while compression and reduces during elongation. Crystal orbital overlap population reveals the higher strength of anti-bonding orbitals. It is mechanically stronger along the Z-axis and weaker along the Y-axis.

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Acknowledgements

The authors gratefully acknowledge the management of Shri Shankaracharya Technical Campus-SSGI for the computing facility in the research laboratory. The first and third authors acknowledge the kind support of the Department of Mechanical Engineering, BIT, Durg.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Bhilai Institute of Technology, Durg, 491001, India

    Harsha Verma & Jitendra Chauhan

  2. Department of Applied Physics, FET-SSGI Shri Shankaracharya Technical Campus, Junwani, Bhilai, 490020, India

    B Keshav Rao & Mohan L Verma

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  1. Harsha Verma
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  2. B Keshav Rao
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  3. Mohan L Verma
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  4. Jitendra Chauhan
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Correspondence to B Keshav Rao.

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Verma, H., Rao, B.K., Verma, M.L. et al. First principles study of breaking energy and mechanical strength of Kevlar-29. Bull Mater Sci 42, 76 (2019). https://doi.org/10.1007/s12034-019-1747-y

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  • DOI: https://doi.org/10.1007/s12034-019-1747-y

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