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(분역회전),Crack(균열),Ferroelectric ceramic actuatorse(강유전체 세라믹 액추에이터),Stress intensity factor(응력확대계수),Internal electrode(내부전극),Electrical nonlinearity(전기적비선형성)