TY - JOUR
T1 - Crack tip dislocation nucleation in FCC solids
AU - Knap, J.
AU - Sieradzki, Karl
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1999
Y1 - 1999
N2 - 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%.
AB - 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%.
UR - http://www.scopus.com/inward/record.url?scp=18144432388&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=18144432388&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.82.1700
DO - 10.1103/PhysRevLett.82.1700
M3 - Article
AN - SCOPUS:18144432388
SN - 0031-9007
VL - 82
SP - 1700
EP - 1703
JO - Physical Review Letters
JF - Physical Review Letters
IS - 8
ER -