用单边缺口拉伸试样研究了外加应力强度因子对PZT5铁电陶瓷电致瞬时断裂以及在硅油中电致滞后断裂的影响. 结果表明, 在硅油中发生瞬时断裂的临界电场强度随外加应力强度因子的升高而线性下降. 外加正、负恒电场在硅油中能发生滞后断裂, 外加K则促进电致滞后断裂. 电致滞后断裂的门槛电场随K升高而线性下降, 且和电场符号无关.外加应力促进恒电场下的滞后断裂表明, 应力、电场和环境对铁电陶瓷的断裂存在耦合作用.
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.
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