Interaction of Screw Dislocation with Edge Interfacial Crack on Fine-Grained Piezoelectric Coating/Substrate

Abstract

The interaction between micro- and macrocracks in a fine-grained piezoelectric coating/substrate under remote antiplane mechanical and in-plane electrical loadings was studied. The principle of superposition and a mapping function method was used to transform the fine-grained coating/substrate structure containing the screw dislocation and the edge interfacial crack into the right semi-infinite plane piezoelectric bimaterial with screw dislocation to simplify the problem. Furthermore, the electric field, displacement field, intensity factors, and image force of these two problems were established. In addition, numerical calculations were then given graphically to study the effects of the elastic modulus of the material, the size of the crack, the thickness of the coating, and the screw dislocation angle on the edge interface crack and dislocation.

Interaction between Screw Dislocation and Interfacial Crack in Fine-Grained Piezoelectric Coatings under Steady-State Thermal Loading

“…According to reference [25], the finite interface region problem can be transformed into the right semi-infinite region problem by the following two mapping functions.…”

Transient Response of Multiple Interface Cracks in Fine-Grained Coating Composite Structures under Impact Loading

“…From the above overview, at present, most of the theoretical research on defects in piezoelectric materials remains at the normal grain size, but there is relatively little theoretical research on interface defects in fine-grained dielectric materials [20][21][22]. At the same time, the mechanical, dielectric, and piezoelectric properties of fine-grained piezoelectric materials are uncertain due to differences in grain size and preparation conditions, and the relationship between them has been mostly analyzed from an experimental perspective [23,24].…”