Abstract
Single-edge-notch-beam (SENB) specimens of soft lead zirconate titanate (PZT) with three different poling directions are tested to determine the fracture resistance enhanced by poling. The specimens poled along the thickness direction toughen the most, while those poled along the longitudinal direction toughen the least. Vickers' indents are carried out to illustrate three-dimensional aspects of poling. Qualitative explanation is given, which incorporates both domain switching and poling-induced microcrack orientations.
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