Crack instability of ferroelectric solids under alternative electric loading
Crack instability of ferroelectric solids under alternative electric loading
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交替电加载下铁电固体的裂纹不稳定性
DOI：
10.1016/j.jmps.2015.04.014
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发表时间：
2015-08
影响因子：
5.3
通讯作者：
Dai-Ning Fang
中科院分区：
文献类型：
--
作者：
Yong-Mao Pei;Yu-Jie Wei;Bin Liu;Dai-Ning Fang
在技术应用中广泛使用的压电和铁电材料的低断裂韧性引起了对其耐久性和安全性的极大关注。到目前为止，这些材料中电场诱导疲劳裂纹扩展的机理还不完全清楚。在这里，我们报告的实验观察，在高频率或大幅度的交替电加载引起显着的温度上升在裂纹尖端的铁电固体。温度的升高降低了裂纹尖端附近材料的畴变能垒，提高了应力强度因子，最终导致裂纹失稳扩展。而在低频或小振幅时，裂纹尖端温度上升平缓，并迅速饱和，没有裂纹扩展现象。结合对裂纹尖端非线性传热的理论分析，构建了裂纹尖端安全工作区域随电场频率和幅值的变化曲线，并通过实验对安全图进行了验证。揭示的电-热-力耦合影响断裂的机理可直接用于指导压电和铁电器件的设计和安全评估。
The low fracture toughness of the widely used piezoelectric and ferroelectric materials in technological applications raises a big concern about their durability and safety. Up to now, the mechanisms of electric-field induced fatigue crack growth in those materials are not fully understood. Here we report experimental observations that alternative electric loading at high frequency or large amplitude gives rise to dramatic temperature rise at the crack tip of a ferroelectric solid. The temperature rise subsequently lowers the energy barrier of materials for domain switch in the vicinity of the crack tip, increases the stress intensity factor and leads to unstable crack propagation finally. In contrast, at low frequency or small amplitude, crack tip temperature increases mildly and saturates quickly, no crack growth is observed. Together with our theoretical analysis on the non-linear heat transfer at the crack tip, we constructed a safe operating area curve with respect to the frequency and amplitude of the electric field, and validated the safety map by experiments. The revealed mechanisms about how electro-thermal-mechanical coupling influences fracture can be directly used to guide the design and safety assessment of piezoelectric and ferroelectric devices.
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