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Proceedings Paper

Effect of cyclic electric fields on crack growth in a moderately soft piezoelectric ceramic
Author(s): S. H. Ferguson; H. W. King; N. Mrad; D. F. Waechter; B. Yan; R. Blacow; S. E. Prasad
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Paper Abstract

Pre-existing cracks, introduced by a Vickers diamond hardness indenter in BM500 (Navy Type II) PZT, exhibit visible growth and thickening when subjected to low frequency electric fields with amplitudes above a threshold on the order of 1.66 Ec. Thickening, but no growth, of cracks is also observed after cycles of a field of 1.64 Ec. The threshold field is related to the ferroelectric, piezoelectric and elastic properties of the ceramic. At fields above the threshold, cracks grow to a limiting size after a relatively low number of cycles, and then increase in width, as opposed to length, when further electric cycles are applied. The maximum size to which field-induced cracks grow is of the order of the separation of the electrodes. Changes observed in the resonance peaks of impedance spectra may be used as a basis for non-destructive identification of defects in piezoelectrics.

Paper Details

Date Published: 10 April 2007
PDF: 4 pages
Proc. SPIE 6529, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2007, 652928 (10 April 2007); doi: 10.1117/12.716885
Show Author Affiliations
S. H. Ferguson, Univ. of Victoria (Canada)
H. W. King, Univ. of Victoria (Canada)
N. Mrad, Defence R&D Canada (Canada)
D. F. Waechter, Sensor Technology Ltd. (Canada)
B. Yan, Sensor Technology Ltd. (Canada)
R. Blacow, Sensor Technology Ltd. (Canada)
S. E. Prasad, Sensor Technology Ltd. (Canada)

Published in SPIE Proceedings Vol. 6529:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2007
Masayoshi Tomizuka; Chung-Bang Yun; Victor Giurgiutiu, Editor(s)

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