研究了不同极化状态下PZT--5H 铁电陶瓷压痕裂纹在应力和电场单独作用以及耦合作用下的扩展行为。结果表明, 压痕裂纹残余应力引起的应力场强度因子近似等于断裂韧性。对沿长度方向极化的试样, 正、负电场均能引起压痕裂纹的扩展, 但正电场的作用更大。电场和应力的耦合作用表现为对应力的线性叠加。
Propagating of unloaded indentation crack in a PZT--5H ferroelectric ceramics with various poling states under single or combined action of mechanical and electric loading has been investigated. The results show that the stress intensity factor induced by the residual stress of an unloaded indentation crack is approximately equal to the fracture toughness. The applied stress or/and electric field, positive and negative, can cause propagating of the indentation crack, and the combined effect of mechanical and electric loadings corresponds to applying an efficient stress.
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