Enhancing Role of Stress on Electric Field Induced Delayed Fracture of a PZT--5 Ferroelelctric Ceramics
应力促进PZT铁电陶瓷的电致滞后断裂

The effect of applied stress intensity factor on the electric field--induced delayed fracture of PZT--5 ferroelectric ceramics in silicon oil, has been investigated using single--edge notched specimens poled along the longitudinal direction. The results show that the critical electric field for instant fracture in silicon oil decreases linearly with increasing the applied stress intensity factor. The threshold electric field for electric field--induced delayed fracture in silicon oil decreases linearly with increasing the applied stress intensity factor. The results indicate that there exists a coupling action between stress, electric field and environment on the delayed fracture of the ferroelectric ceramics.