Studies of crack growth and propagation of single-crystal nickel by molecular dynamics

Po Hsien Sung, Tei-Chen Chen

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

Abstract: The crack growth and propagation of pre-cracked single-crystal nickel under mode I loading conditions are investigated by molecular dynamics simulation based on the many-body tight-binding potential. The effects of temperature, loading rate, and orientations are evaluated in terms of atomic trajectories, von Mises stress, and a centrosymmetry parameter. Simulation results clearly show that partial dislocations begin to slip at the crack tip and propagate along the close-packed (1 1 1) plane until fracture. There are different modes of crack propagation between finite or infinite length in y direction. A brittle-to-ductile transition occurs between temperatures of 50 and 700 K, with the brittle fracture response more obvious at lower temperature. The critical stress increases with increasing strain rate and decreasing temperature. The magnitude of critical stress is σc<111> > σc<100> > σc<110> for difference direction Ni nanoribbons, indicating that the critical stress is strongly dependent on the crystallographic direction.

Original languageEnglish
Article number6394
Pages (from-to)151-158
Number of pages8
JournalComputational Materials Science
Volume102
DOIs
Publication statusPublished - 2015 Jan 1

All Science Journal Classification (ASJC) codes

  • Computer Science(all)
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Computational Mathematics

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