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다양한 전계인가율과 온도에서 강유전 세라믹의 이력선도 계측과 기준 잔류 분극 및 변형률 거동 예측
지대원,김상주,Ji, Dae Won,Kim, Sang-Joo 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.6
A poled lead zirconate titanate (PZT) rectangular parallelepiped specimen was subjected to through-thickness electric fields at five loading rates and four temperatures. The rates of the electric field were 0.01, 0.10, 0.25, 0.50, and $1.00MVm^{-1}s^{-1}$; the temperatures were 20, 50, 80, and $110^{\circ}C$. From the measured polarization hysteresis responses, the so-called reference remnant polarization and strains were calculated. Using the calculated reference remnant polarization hysteresis loops, the effects of loading rates and temperature were discussed; using the calculated reference remnant strains, strain butterfly loops were calculated and compared with observations.
상온과 고온에서 압축하중을 받는 PZT에서의 잔류상태변수와 선형재료상수의 변화
지대원,김상주,Ji, Dae Won,Kim, Sang-Joo 한국세라믹학회 2013 한국세라믹학회지 Vol.50 No.1
A poled lead zirconate titanate (PZT) cube specimen is subjected to impulse-type compressive stress with increasing magnitude in parallel to the poling direction at four room and high temperatures. During the ferroelastic domain switching induced by the compressive stress, electric displacement in the poling direction and longitudinal and transverse strains are measured. Using the measured responses, linear material properties, namely, the piezoelectric and elastic compliance coefficients, are evaluated by a graphical method, and the effects of stress and temperature are analyzed. Finally, the dependency of the evaluated linear material properties on relative remnant polarization is analyzed and discussed.