Elucidating asymmetric yield behavior of copper nano-wires during tensile and compressive load

Wei Ting Liu, Chun I. Hsiao, Wen Dung Hsu

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1 Citation (Scopus)

Abstract

Molecular dynamic simulations were performed to investigate the effects of tensile and compressive loading on the mechanical properties of face-centered cubic single-crystal copper [001] nano-wires with diameters ranging from 2 to 10 nm. Characterization of the initial optimized structures revealed large variations in interatomic spacing, stress, and potential energy in all nano-wires, which resulted in tensile stress for surface atoms and compressive stress for internal atoms. This phenomenon is more apparent in thin nano-wires (<6 nm) than thick nano-wires (≥10 nm). These variations are the origins of asymmetric yielding and asymmetric Poisson ratio in [001] copper nano-wires during tension and compression. For example, the Poisson's ratio exceeds 0.5 as the compressive strain approaches yield, indicating that the mechanical properties of single-crystal [001] nano-wire show strong directionality. The finding provides a fundamental understanding of the influence of the wire diameter on the mechanical properties of [001] nano-wires.

Original languageEnglish
Article number143503
JournalJournal of Applied Physics
Volume114
Issue number14
DOIs
Publication statusPublished - 2013 Oct 14

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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