Interactions between domain switching and crack propagation in poled BaTiO3 single crystal under mechanical loading
Interactions between domain switching and crack propagation in poled BaTiO3 single crystal under mechanical loading
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机械载荷下极化 BaTiO3 单晶的畴切换与裂纹扩展之间的相互作用
DOI:
10.1016/j.actamat.2007.06.024
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发表时间:
2007-10
期刊:
影响因子:
9.4
通讯作者:
中科院分区:
文献类型:
--
作者:
In this paper, the interactions between the crack propagation and corresponding domain switching in ferroelectric single crystal under mechanical loading were investigated. An experimental setup with a polarized light microscope (PLM) was designed and constructed to in situ observe the crack propagation in poled BaTiO3specimens subjected to three-point-bending loading. The observed domain switching was stimulated by the intensive stress field near the crack tip, and the theoretical R-curve taking into account the domain switching toughening agrees well with the experimental results quantitatively. It is confirmed from the actual switched zone that the 90° domain switching is the major mechanism of the fracture toughening, and the apparent fracture toughness increases by 150% in the BaTiO3single crystal specimen.
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