Crack tip dislocation nucleation in FCC solids

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39 Scopus citations


We present results of molecular dynamic simulations aimed at examining crack tip dislocation emission in fcc solids. The results are analyzed in terms of recent continuum formulations of this problem. In mode II, Au, Pd, and Pt displayed a new unanticipated mechanism of crack tip dislocation emission involving the creation of a pair of Shockley partials on a slip plane one plane below the crack plane. In mode I, for all the materials examined, Rice’s continuum formulation [J. Mech. Phys. Solids 40, 239 (1992)] underestimated the stress intensity for dislocation emission by almost a factor of 2. Surface stress corrections to the emission criterion brought the agreement between continuum predictions and simulations to within 20%.

Original languageEnglish (US)
Pages (from-to)1700-1703
Number of pages4
JournalPhysical Review Letters
Issue number8
StatePublished - 1999

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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