Embedded atom method simulations of single crystal nickel ductile fracture

G. P. Potirniche*, M. F. Horstemeyer, G. J. Wagner, P. M. Gullett

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Molecular dynamics simulations of single crystal nickel were performed to analyze the influence of specimen size on ductile fracture. Uniaxial tension of four specimen sizes ranging from approximately 5,000 atoms to 170,000 atoms with the same initial void volume fraction was performed at high rates of deformation (108 - 1010/sec). The 3D specimens were given a rectangular initial shape with uniform thickness and were provided with one and two cylindrical voids. Parameters quantifying damage evolution such as, post-initial yielding stress-strain behavior and void volume fraction evolution were computed as the voids grew and coalesced due to the increasing applied tractions. The results showed that the different specimen size changes the dislocation pattern, the void aspect ratio, and the stress-strain response of the specimens. From zero to 20% strain the void growth is dominated by dislocation nucleation that correlates with the size scale influence observed by Horstemeyer et al. [1]. Beyond 20% the size scale differences cease to be relevant because the effects of dislocation nucleation are overcome by dislocation interaction. This study provides the fodder for development of continuum damage mechanics phenomenological models for use in nanocrystalline materials.

Original languageEnglish (US)
Title of host publication11th International Conference on Fracture 2005, ICF11
Pages3860-3865
Number of pages6
StatePublished - Dec 1 2005
Event11th International Conference on Fracture 2005, ICF11 - Turin, Italy
Duration: Mar 20 2005Mar 25 2005

Publication series

Name11th International Conference on Fracture 2005, ICF11
Volume5

Other

Other11th International Conference on Fracture 2005, ICF11
CountryItaly
CityTurin
Period3/20/053/25/05

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

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