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Screw Dislocations in a Two‐Phase Plate and a Sandwich Specimen
Author(s) -
Wang ShingDar
Publication year - 1999
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/(sici)1521-3951(199910)215:2<933::aid-pssb933>3.0.co;2-d
Subject(s) - materials science , phase (matter) , dislocation , shear modulus , composite material , nucleation , shear (geology) , modulus , physics , thermodynamics , quantum mechanics
The problems of a screw dislocation in a two‐phase plate with two arbitrary thicknesses and in a sandwich specimen of finite thickness have been solved completely. The stress fields and image forces on a screw dislocation for the two cases are given. There exist equilibrium positions in the soft phase or not depending on the thickness and shear modulus ratio being larger or smaller than the critical value. Dislocations in a two‐phase plate are most likely to pile up and nucleate micro‐cracks in the soft phase at a distance smaller than 0.2 thickness of the soft phase from interface. It is found that when the thickness ratio of the soft phase over the hard phase is greater than 20, the distance between stable equilibrium point and the interface arranged in decreasing order is: sandwich specimen > two‐phase plate > thin film on a semi‐infinite substrate.