TY - GEN
T1 - Destruction mechanism of multilayer ceramic actuators
AU - Uchino, Kenji
AU - Furuta, Atsushi
PY - 1992/1/1
Y1 - 1992/1/1
N2 - The destruction mechanism in multilayer ceramic actuators under cyclic electric fields has been investigated. Crack propagation has been observed dynamically using CCD (charge-coupled device) microscopy, and the accompanying characteristics of the induced displacement and acoustic emission were measured simultaneously. The piezoelectric Pb(Ni13/Nb23/)O3-PbTiO3 and the phase-transition-related actuator material (antiferroelectric) PbZrO3-PbSnO3-PbTiO3 exhibit a marked difference in the manner of destruction, probably due to the strain-induction mechanism. In the piezoelectrics, the crack initiated near the edge of the internal electrode and propagated basically in three directions: Two cracks moved toward the outside electrostrictively inactive region, forming an angle of 100 degrees with each other, while the third moved along the ceramic-electrode interface. In antiferroelectrics, the crack began slightly inside the edge of the internal electrode and propagated along the center area between the pair electrodes. Later crack branches were generated around the electrode edge. A very smart actuator system containing a safety feedback function, which can stop an actuator drive safely without causing any serious damage to the work, e.g., in a precision lathe machine, is proposed.
AB - The destruction mechanism in multilayer ceramic actuators under cyclic electric fields has been investigated. Crack propagation has been observed dynamically using CCD (charge-coupled device) microscopy, and the accompanying characteristics of the induced displacement and acoustic emission were measured simultaneously. The piezoelectric Pb(Ni13/Nb23/)O3-PbTiO3 and the phase-transition-related actuator material (antiferroelectric) PbZrO3-PbSnO3-PbTiO3 exhibit a marked difference in the manner of destruction, probably due to the strain-induction mechanism. In the piezoelectrics, the crack initiated near the edge of the internal electrode and propagated basically in three directions: Two cracks moved toward the outside electrostrictively inactive region, forming an angle of 100 degrees with each other, while the third moved along the ceramic-electrode interface. In antiferroelectrics, the crack began slightly inside the edge of the internal electrode and propagated along the center area between the pair electrodes. Later crack branches were generated around the electrode edge. A very smart actuator system containing a safety feedback function, which can stop an actuator drive safely without causing any serious damage to the work, e.g., in a precision lathe machine, is proposed.
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U2 - 10.1109/ISAF.1992.300660
DO - 10.1109/ISAF.1992.300660
M3 - Conference contribution
T3 - ISAF 1992 - Proceedings of the 8th IEEE International Symposium on Applications of Ferroelectrics
SP - 195
EP - 198
BT - ISAF 1992 - Proceedings of the 8th IEEE International Symposium on Applications of Ferroelectrics
A2 - Liu, Michael
A2 - Safari, Ahmad
A2 - Kingon, Angus
A2 - Haertling, Gene
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 8th IEEE International Symposium on Applications of Ferroelectrics, ISAF 1992
Y2 - 30 August 1992 through 2 September 1992
ER -