Interaction of a screw dislocation with an interfacial edge crack in a two-phase piezoelectric material |
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Authors: | Liu Jinxi Liu Ai Jiang Zhiqing |
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Institution: | (1) Department of Mechanics and Engineering Science, Shijiazhuang Railway Institute, 050043 Shijiazhuang, China |
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Abstract: | The interaction of a screw dislocation with an interfacial edge crack in a two-phase piezoelectric medium is investigated.
Closed-form solutions of the elastic and electrical fields induced by the screw dislocation are derived using the conformal
mapping method in conjunction with the image principle. Based on the electroelastic fields derived, the stress and electric
displacement intensity factors, the image force acting on the dislocation are given explicitly. We find that the stress and
electric displacement intensity factors depend on the effective electroelastic material constants. In the case where one of
two phases is purely elastic, the stress intensity factor and image force are plotted to illustrate the influences of electromechanical
coupling effect, the position of the dislocation and the material properties on the interaction mechanism.
The project supported by the Doctoral Foundation of Hebei Province (B2003113) |
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Keywords: | two-phase medium piezoelectricity screw dislocation stress intensity factors image force |
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