小样品力学性能试验方法(Modified Small Punch Tests, 简称MSP)是评价陶瓷材料力学性能的一种有效方法. 采用改进型多场耦合小冲压(MSP)试验法评价了Pb(Zr,Ti)O3陶瓷(PZT)在力电耦合和纯力场下的疲劳性能. 通过对比在纯力场和力电耦合下的力学性能可以看出: 与纯力场下相比, PZT陶瓷在力电耦合下的断裂强度会降低. 在力场和电场的同时作用下, 疲劳寿命显著缩短, 压电陶瓷材料内部易出现沿晶断裂.
Modified small punch (MSP) tests are effective evaluation methods for mechanical properties by using small specimens. Fatigue properties of PZT ceramics under electro-mechanical coupling field and pure force field were evaluated with multi-fields coupling MSP tests. It is found that the fracture strength of the samples under electro- mechanical field would sharply decrease, compared with the samples under pure force field. Fatigue life would decrease greatly and intergranular fracture would happen easily under electro-mechanical coupling field.
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