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Edge dislocations in crystal structures considered as traveling waves in discrete models


Carpio, Ana y Bonilla, L.L. (2003) Edge dislocations in crystal structures considered as traveling waves in discrete models. Physical Review Letters, 90 (13). ISSN 0031-9007

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The static stress needed to depin a 2D edge dislocation, the lower dynamic stress needed to keep it moving, its velocity, and displacement vector profile are calculated from first principles. We use a simplified discrete model whose far field distortion tensor decays algebraically with distance as in the usual elasticity. Dislocation depinning in the strongly overdamped case (including the effect of fluctuations) is analytically described. N parallel edge dislocations whose average interdislocation distance divided by the Burgers vector of a single dislocation is L≫1 can depin a given one if N=O(L). Then a limiting dislocation density can be defined and calculated in simple cases.

Tipo de documento:Artículo
Materias:Ciencias > Física > Física matemática
Ciencias > Física > Física de materiales
Código ID:15012

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Última Modificación:28 Oct 2016 08:04

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