用单边缺口拉伸试样研究了外加应力强度因子对PZT-5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EF随外加应力强度因子KI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KI则促进电致滞后断裂.电致滞后断裂的门槛电场EDF随KI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.
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