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Interaction between a piezoelectric screw dislocation and a finite crack with surface piezoelectricity

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Abstract

We analytically investigate the contribution of surface piezoelectricity to the interaction between a piezoelectric screw dislocation and a finite crack in a hexagonal piezoelectric solid. The piezoelectric screw dislocation suffers jumps in the displacement and in the electric potential across the slip plane, and meanwhile it is subjected to a line force and a line charge at its core. The original boundary value problem is reduced to two sets of coupled first-order Cauchy singular integro-differential equations by considering a distribution of line dislocations, electric-potential-dislocations, line forces and line charges on the crack. By using a diagonalization method, the two sets of equations are decoupled into four independent singular integro-differential equations, each of which can be numerically solved by means of the collocation method. Our analysis reveals that in general the stresses, strains, electric displacements and electric fields exhibit both the weak logarithmic and the strong square root singularities at the two crack tips. The image force acting on the piezoelectric screw dislocation due to its interaction with the finite crack is calculated.

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Authors and Affiliations

  1. School of Mechanical and Power Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China

    Xu Wang & Yang Xu

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  1. Xu Wang
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  2. Yang Xu
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Correspondence to Xu Wang.

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Wang, X., Xu, Y. Interaction between a piezoelectric screw dislocation and a finite crack with surface piezoelectricity. Z. Angew. Math. Phys. 66, 3679–3697 (2015). https://doi.org/10.1007/s00033-015-0584-0

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  • DOI: https://doi.org/10.1007/s00033-015-0584-0

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