Local fracture properties in ferroelectric relaxor PZN-4.5%PT single crystals

William S. Oates; Kyle G. Webber; Christopher S. Lynch; Alain B. Kounga Njiwa; Doru C. Lupascu

doi:10.1117/12.598813

16 May 2005 Local fracture properties in ferroelectric relaxor PZN-4.5%PT single crystals

William S. Oates, Kyle G. Webber, Christopher S. Lynch, Alain B. Kounga Njiwa, Doru C. Lupascu

Proceedings Volume 5761, Smart Structures and Materials 2005: Active Materials: Behavior and Mechanics; (2005) https://doi.org/10.1117/12.598813
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2005, San Diego, California, United States

Abstract

Local fracture properties in poled [Pb(Zn_1/3Nb_2/3)O₃]_(1-x)-[PbTiO₃]_x (x=0.045, PZN-4.5%PT) ferroelectric relaxor single crystals were assessed. The crystals were cut along the [100], [010], and [001] planes. Scanning electron micrographs of Vickers indentations for two different crack orientations were used to determine the crack tip toughness (K_tip) and the local critical energy release rate (G_tip). Cracks oriented along the [010] and [110] crystal planes were found to have practically identical local fracture properties. These properties were determined using Stroh's formalism to account for the large anisotropic material coefficients.

Citation Download Citation

William S. Oates, Kyle G. Webber, Christopher S. Lynch, Alain B. Kounga Njiwa, and Doru C. Lupascu "Local fracture properties in ferroelectric relaxor PZN-4.5%PT single crystals", Proc. SPIE 5761, Smart Structures and Materials 2005: Active Materials: Behavior and Mechanics, (16 May 2005); https://doi.org/10.1117/12.598813

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