The effect of uniaxial stress on the electro-mechanical response of 8/65/35 PLZT
- Georgia Inst. of Tech., Atlanta, GA (United States). George W. Woodruff School of Mechanical Engineering
8/65/35 PLZT is characterized under stress and electric field loading above the coercive field. Strain-electric field and electric-displacement-electric-field hysteresis loops are measured at various compressive stress levels showing the effect of stress on the electro-mechanical coupling. Stress-strain curves are run at zero electric field, showing that depolarization begins at as little as 5 MPa. The limitations of linear constitutive modeling and the limitations of this composition of PLZT as an actuator material are examined. The yield or ferroelastic switching stress is suggested as a good criteria for assessing the capability of actuator ceramics. This parameter is an indication of the actuation limitations of the material. An equivalence of the slopes of the strain-electric-field curve at several compressive stress levels and the electric-displacement-stress curve at the same stress level is observed. This suggests that the conjugacy of the piezoelectric coefficients may hold during path dependent polarization switching.
- OSTI ID:
- 415406
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 10 Vol. 44; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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