Crack Tip Dislocation Nucleation in FCC Solids
Crack Tip Dislocation Nucleation in FCC Solids
复制标题
FCC 固体中的裂纹尖端位错成核
DOI:
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发表时间:
1999
期刊:
影响因子:
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通讯作者:
K. Sieradzki
中科院分区:
文献类型:
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作者:
J. Knap;K. Sieradzki
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{close_quote}s continuum formulation [J.thinspthinspMech.thinspthinspPhys.thinspthinspSolids {bold 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{percent}. {copyright} {ital 1999} {ital The American Physical Society}