期刊
PHILOSOPHICAL MAGAZINE
卷 92, 期 23, 页码 2947-2956出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786435.2012.682176
关键词
edge dislocation; mechanical stability; finite element method
Dislocations have been considered as mechanically unstable defects in bulk crystals, ignoring the Peierls oscillations. Eshelby [J. Appl. Phys. 24 (1953) p. 176] had showed that a screw dislocation can be stable in a thin cylinder. In the current work, considering Eshelby's example of an edge dislocation in a single crystalline plate, we show that an edge dislocation can be stable in a finite crystal. Using specific examples, we also show that the position of stability of an edge dislocation can be off-centre. This shift in the stability from the centre marks the transition from a stable dislocation to an unstable one. The above-mentioned tasks are achieved by simulating edge dislocations using the finite element method.
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