Abstract
Subjected to the prior out-of-plane poling, the ferroelectrics can be toughened considerably. The present paper describes the variation of the stress intensity factor (SIF) by 90° switching in ferroelectrics. The analysis is carried out for the combined mechanical and electrical loading, with simple relations obtained for the case of the purely electrical loading. The out-of-plane poling is found to raise the SIF for the crack initiation, but appreciably reduces the SIF for the crack growth in a steady state. More stable fracture resistance curves can be achieved by the out-of-plane poling. This prediction is supported quantitatively by the testing data of SENB specimens of PZT-5 samples, when the toughening effects of polings in three orthogonal directions are compared.
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The project supported by Sino-Germany Center for Science and Technology (G2050/8)
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Wei, Y., Fei, F. Toughening of ferroelectrics by the out-of-plane poling. Acta Mech Sinica 19, 147–153 (2003). https://doi.org/10.1007/BF02487676
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DOI: https://doi.org/10.1007/BF02487676