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Title: | Prediction of Mechanical Properties of Steel Nanowires using Molecular Dynamics |
Authors: | Nadeesha, Tharundi M.D. Liyanage, J.K. Liyanage, Laalitha S. I. |
Keywords: | Nanowires, Uniaxial tensile test |
Issue Date: | 2021 |
Publisher: | Faculty of Computing and Technology, University of Kelaniya, Sri Lanka |
Citation: | Nadeesha, Tharundi M.D., Liyanage, J.K and Liyanage, Laalitha S. I. (2021). Prediction of Mechanical Properties of Steel Nanowires using Molecular Dynamics. In : 6th International Conference on Advances in Technology and Computing (ICATC–2021). Faculty of Computing and Technology, University of Kelaniya, Sri Lanka, p.9. |
Abstract: | Nanowires have received increasing interest due to their unique properties and potential applications [1]. Limited studies have been conducted on tensile strength and mechanical properties of pure iron and iron alloy-based nanowires using simulations. In this study, the dependence of the mechanical properties of steel nanowires with different carbon percentages at varying temperatures is investigated. Atomic interactions between Fe and C atoms are modelled using interatomic force fields for molecular dynamics (MD) simulations. Four interatomic potentials were evaluated [2][3][4][5][6] using their bulk properties. Modified embedded atom method (MEAM) potential by Liyanage et al. was selected due to its accuracy in predicting properties of BCC Fe, Fe-C in B1 rock salt structure, and properties of BCC iron structure with varying C percentages. Uniaxial tensile test simulations at varying C atom percentages and different temperatures are conducted using MD simulations with the LAMMPS package. The amount of C was varied from 0 – 10 % at temperatures ranging from 0.1 K – 900 K. Mechanical properties of steel nanowires were extracted from the stress-strain curves generated by the tensile simulations. Young’s modulus of the steel nanowires increased in the temperature range of 0.1 K – 300 K while decreased in the range of 600 K - 900 K with respect to the C %. Yield stress and Ultimate Tensile Stress gradually decreased with the increase of C atoms from 0 – 10 %. Predicted results were compared with the results of bulk steel experimental values [7]. The micro-structural changes in the nanowires were analysed with common neighbor analysis (CNA). CNA showed the rapid formation of slip planes with increasing C% and increased propagation of slip planes contributes to the reduction in the strength of the nanowires. |
URI: | http://repository.kln.ac.lk/handle/123456789/24390 |
Appears in Collections: | ICATC–2021 |
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