STRENGTH PROPERTIES OF POLED PZT SUBJECTED TO BIAXIAL FLEXURAL LOADING IN HIGH ELECTRIC FIELD

Journal Article · Fri Jan 01 00:00:00 EST 2010 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1551-2916.2010.03800.x· OSTI ID:991663

Wang, Hong ^[1]; Lin, Hua-Tay ^[1]; Wereszczak, Andrew A ^[1]

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1. ORNL

Failure of poled PZT has been experimentally studied using ball-on-ring (BoR) biaxial flexure strength tests with an electric field concurrently applied. The as-received and aged PZTs were tested in high electric fields of -3 to 4 times the coercive field. Both the sign and the magnitude of electric field had a significant effect on the strength of poled PZT. A surface flaw type with a depth of around 18 m was identified as the strength limiter and responsible for the failure of the tested PZT. With a value of 0.76 MPa m1/2 in the open circle condition, the fracture toughness of the poled PZT was affected by an applied electric field just as the strength was affected. These results and observations have the potential to serve probabilistic reliability analysis and design optimization of multilayer PZT piezo actuators.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 991663
• Journal Information: Journal of the American Ceramic Society, Vol. 93, Issue 9; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTUATORS
DEFECTS
DESIGN
ELECTRIC FIELDS
FRACTURE PROPERTIES
OPTIMIZATION
RELIABILITY
Piezoelectric
mechanical strength
flaw
Weibull modulus
electric field