Phys. Rev. Lett. 82, 1700–1703 (1999)Crack Tip Dislocation Nucleation in FCC SolidsReceived 19 November 1998; published in the issue dated 22 February 1999 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%. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.82.1700
DOI:
10.1103/PhysRevLett.82.1700
PACS:
61.72.Lk, 61.72.Nn, 62.20.Fe, 62.20.Mk
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