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Effect of Domain Switching on Cracking in Ferroelectric Ceramic Actuators  

Jeong Kyoung Moon (전남대학교 대학원 기계공학과)
Kim Jae Yun (전남대학교 대학원 기계공학과)
Beom Hyeon Gyu (인하대학교 기계공학과)
Publication Information
Journal of the Korean Society for Precision Engineering / v.22, no.2, 2005 , pp. 113-119 More about this Journal
Abstract
A crack emanating from an internal electrode or a conducting damage path in ferroelectric ceramic actuators is analyzed. The boundary of the domain switching zone near the edge of the internal electrode in a ceramic multilayer actuator is determined based on the nonlinear electric theory. The stress intensity factor induced by a ferroelectric domain switching under small scale conditions is numerically obtained for flaws of various sizes near the electrode edge. It is found that stress intensity factor near the crack tip depends on the material property of the electrical nonlinearity.
Keywords
Domain switching; Crack; Ferroelectric ceramic actuators; Stress intensity factor; Internal electrode; Electrical nonlinearity;
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