Crack tip dislocation nucleation in FCC solids

被引：38
作者：
Knap, J [1 ]
Sieradzki, K
机构：
[1] CALTECH, Grad Aeronaut Labs, Pasadena, CA 91125 USA
[2] Arizona State Univ, Dept Mech & Aerosp Engn, Tempe, AZ 85287 USA
来源：
PHYSICAL REVIEW LETTERS | 1999年 / 82卷 / 08期
关键词：
D O I：
10.1103/PhysRevLett.82.1700
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We present results of molecular dynamic simulations aimed at examining crack tip dislocation emission in fee 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%.
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收藏
页码：1700 / 1703
页数：4
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