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Stability of the Dislocation Dipole in Half‐Space
Author(s) -
Bacon D. J.
Publication year - 1968
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19680290203
Subject(s) - dipole , dislocation , peierls stress , isotropy , stress field , condensed matter physics , materials science , stress (linguistics) , shear stress , surface (topology) , plane (geometry) , shear (geology) , geometry , physics , mathematics , optics , composite material , dislocation creep , thermodynamics , quantum mechanics , linguistics , philosophy , finite element method
The stability of an edge dislocation dipole of infinite length lying parallel to the free surface of an isotropic, semi‐infinite medium has been investigated by determining the dipole orientation for which the stress on both poles is less than a chosen dislocation friction stress. It is found that the effects of the surface are considerable, despite the fact that the stress field of the dipole is short‐ranged. In particular, the surface can induce orientations of stability which are not expected from the infinite body behaviour. Similar results are likely to arise for prismatic dislocation loops in bounded media. Some aspects of the effect of an applied shear stress on the dipole are also studied.