Abstract
Domain polarization switch near the tip of a crack plays a critical role in the fracture or toughening of ferroelectric ceramics. The intensive electric field near a crack tip stimulates local domain switching. Experiment indicates that the domain band structure in front of an indentation crack is unconventional, attributed to the highly localized crack tip electric field. The partially switched ferroelectric grain resembles a banded Eshelby inclusion embedded in a polycrystalline ferroelectric matrix. The domain wall energy for unconventional domain structures is estimated via arrays of misfit dislocations. The analysis prescribed in this paper predicts important aspects including the volume fraction, the thickness, and the orientation of switched domain bands ahead of the crack.
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