Crack propagation induced by incompatible domain switching in BaTiO3 crystal under electric field loading

被引：1
|
作者：
Li, Yingwei [1 ,2 ]
Zhu, Dapeng [1 ,2 ,3 ]
机构：
[1] Wuhan Univ, Sch Civil Engn, Wuhan 430072, Peoples R China
[2] Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China
[3] Wuchang Univ Technol, Sch Intelligent Construct, Wuhan 430223, Hubei, Peoples R China
来源：
ENGINEERING FRACTURE MECHANICS | 2021年 / 256卷
基金：
中国国家自然科学基金;
关键词：
BaTiO3 crystal Incompatible domain switching Stress concentration Crack propagation Electrical boundary condition; FERROELECTRIC SINGLE-CRYSTALS; BOUNDARY-CONDITIONS; FRACTURE-MECHANICS; PERMEABLE CRACKS; CERAMICS DRIVEN; ENERGY DENSITY; FATIGUE; GROWTH; TIP; BEHAVIOR;
D O I：
10.1016/j.engfracmech.2021.107988
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Using a system composed of a polarized light microscopy and a charge coupled device (CCD), the crack propagation behavior in BaTiO3 (BTO) crystal under electric field was in situ investigated with the field direction parallel or perpendicular to the crack surface. In addition, the growth behavior of Vickers indentation surface cracks under alternating electric field was also in situ investigated. Three crack propagation modes induced by incompatible domain switching were proposed based on our observation. The electrical boundary condition of the crack surface was also characterized by measuring and comparing the hysteresis loop of a perfect BTO crystal without crack and a BTO crystal completely fractured in half. Results demonstrate that the electrical boundary condition of a fresh natural crack is permeable, and evolves from permeable to partial permeable during cyclic electric field loading.
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收藏
页数：13
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