Effect of elecrical boundary conditions on dmain switching near the crack tip in piezoceramics

摘要

A finite element was developed to model the dielectric property of the medium that fills the crack cavity in a piezoelectric material. The element was interfaced with the commercial code ABAQUS which provides the piezoelectric element to model the cracked piezoelectric body. The crack cavity permeability effects on the near tip stresses and electric fields in a compact tension specimen were investigated and disussed. SThe domain switching zones corresponding to various loads and crack surface electric boundary conditions were obtaind. As expected, an increased permeabiity in the crack cavity decreased the size of domain switching zone. It was also found that the outcome of domain switching depends on the lading sequence.