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Crack kinking in a piezoelectric solid

โœ Scribed by Ting Zhu; Wei Yang

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
348 KB
Volume
36
Category
Article
ISSN
0020-7683

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โœฆ Synopsis

The intrinsic coupling between the mechanical and the electric _elds assigns a unique feature for the fracture in a piezoelectric solid[ We model the kink of a crack by continuous distribution of edge dislocations and electric dipoles[ The problem admits an approach based on the Stroh formalism[ A set of coupled singular integral equations are derived for the dislocation and electric dipole density functions associated with a kinked crack[ Numerical results indicate that the crack tends to propagate in a straight line under a tensile stress and a positive electric _eld[ For a crack subjected to the mixed mode mechanical loading\ a superimposed positive electric _eld tends to reduce the kink angle[ The in~uence of the non!singular T! stress!charge parallel to a crack is also investigated[ It is shown that a transverse tensile stress or a positive transverse electric _eld will lead to further deviation of the kinked crack from the crack extension line[

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