Piezoelectric screw dislocations interacting with a circular inclusion with imperfect interface |
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Authors: | B Jin Q H Fang |
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Institution: | (1) College of Civil Engineering, Hunan University, Changsha, 410082, People’s Republic of China;(2) College of Mechanicsand Aerospace, Hunan University, Changsha, 410082, People’s Republic of China |
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Abstract: | The electroelastic coupling interaction between multiple screw dislocations and a circular inclusion with an imperfect interface
in a piezoelectric solid is investigated. The appointed screw dislocation may be located either outside or inside the inclusion
and is subjected to a line charge and a line force at the core. The analytic solutions of electroelastic fields are obtained
by means of the complex-variable method. With the aid of the generalized Peach–Koehler formula, the explicit expressions of
image forces exerted on the piezoelectric screw dislocations are derived. The motion and the equilibrium position of the appointed
screw dislocation near the circular interface are discussed for variable parameters (interface imperfection, material electroelastic
mismatch, and dislocation position), and the influence of the nearby parallel screw dislocations is also considered. It is
found that the piezoelectric screw dislocation is always attracted by the electromechanical imperfect interface. When the
interface imperfection is strong, the impact of material electroelastic mismatch on the image force and the equilibrium position
of the dislocation becomes weak. Additionally, the effect of the nearby dislocations on the mobility of the appointed dislocation
is very important. |
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Keywords: | Screw dislocations Imperfect interface Piezoelectric solid Image force |
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