Interaction between a semi-infinite crack and a screw dislocation in a piezoelectric material

Citation
Ky. Lee et al., Interaction between a semi-infinite crack and a screw dislocation in a piezoelectric material, J APPL MECH, 67(1), 2000, pp. 165-170
Citations number
17
Categorie Soggetti
Mechanical Engineering
Journal title
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
ISSN journal
00218936 → ACNP
Volume
67
Issue
1
Year of publication
2000
Pages
165 - 170
Database
ISI
SICI code
0021-8936(200003)67:1<165:IBASCA>2.0.ZU;2-N
Abstract
The interaction between a semi-infinite crack and a screw dislocation under antiplane mechanical and in-plane electrical loading in a linear piezoelec tric material is studied in the framework of linear elasticity theory. A st raight dislocation with the Burgers vector normal to the isotropic basal pl ane near a semi-infinite crack tip is considered. In addition to having a d iscontinuous electric potential across the slip plane, the dislocation is s ubjected to a line-force and a line-charge at the core. The explicit soluti on for the model is derived by means of complex variable and conformal mapp ing methods. The classical 1/root r singularity is observed for the stress, electric displacement, and electric field at the crack tip. The force on a screw dislocation due to the existence of a semi-infinite crack subjected to external electromechanical loads is calculated. Also, the effect of the screw dislocation with the line-force and line-charge at the core on the cr ack-tip fields is observed through the field intensity factors and the crac k extension force. [S0021-8936(00)01501-4].