抄録
This paper discusses the delayed fracture and localized polarization switching near a crack tip in three-point bending piezoceramics under electromechanical loading. Delayed fracture experiments were performed on the piezoelectric ceramics with single-edge precracked-beam method. A nonlinear finite element analysis was also employed to calculate the fracture mechanics parameters such as energy release rate for the permeable, impermeable, open and discharging crack face boundary conditions. The effects of applied electric field and localized polarization switching on the fracture mechanics parameters and lifetime vs energy release rate curves were then examined
