Failure Characteristics of PZT Ceramic During Cyclic Loading

Okayasu, Mitsuhiro; Ogawa, Tatsuro

doi:10.1007/s11664-020-08303-7

Cited by 3 publications

(3 citation statements)

References 17 publications

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“…In this work, the mean maximum voltage was used as a parameter to evaluate electrical power generation. Details of this approach can be found elsewhere [10]. The piezoelectric properties were further investigated at various temperatures (−190°C to 180°C).…”

Section: Experimental Conditionsmentioning

confidence: 99%

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Piezoelectric properties of lead zirconate titanate ceramics at low and high temperatures

Okayasu

Okawa

2021

Advances in Applied Ceramics

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The material properties and damage characteristics of lead zirconate titanate (PZT) ceramics were investigated at various temperatures (-190 °C to 180 °C). A positive voltage was obtained when the sample was cooled from 20 °C to -190 °C, while a negative voltage was obtained when the sample was warmed from -190 °C to 180 °C. The difference between the positive and negative values depended on the thermal stress. Compressive stress generated a more positive voltage in the cooling process, while tensile stress led to a more negative voltage in the warming process). The voltage values also depended on the cooling (or warming) rate of the sample, e.g., the greater the cooling (or warming) rate, the greater the voltage. When cyclic loading was conducted mechanically at -190 °C, the voltage reduced, but it was recovered after warming to 20 °C. Damage of the PZT ceramic (90° domain switching) was detected when the sample was cooled to -190 °C. This was due to the high thermal stress, resulting in a low voltage.

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Section: Experimental Conditionsmentioning

confidence: 99%

“…In this work, the mean maximum voltage was used as a parameter to evaluate electrical power generation. Details of this approach can be found elsewhere [10].…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Piezoelectric properties of lead zirconate titanate ceramics at low and high temperatures

Okayasu

Okawa

2021

Advances in Applied Ceramics

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“…The microstructural inhomogeneities cause mechanical discontinuities and thus induce high stress concentrations, which may induce crack initiation or subcritical crack growth [ 2 ]. More than 90% of electronic component failures are caused by fatigue [ 3 ]. Consequently, the study of fatigue crack growth is a key factor to determine the lifetime of these smart ceramic devices.…”

Section: Introductionmentioning

confidence: 99%

Cyclic Mechanical Fatigue Lifetime of Bi0.5Na0.5TiO3-Based Eco-Piezoceramics

et al. 2021

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The mechanical strength and cyclic fatigue behavior of PIC700 commercial eco-piezoceramic disks are investigated under biaxial loading on unpoled and poled samples. The bending strength of unpoled samples was higher than those of poled ones. Fatigue tests were conducted under a load ratio of 10 at a frequency of 20 Hz with a sinusoidal waveform. The curve fitting for the S-N fatigue diagram is used to predict the lifetime of these eco-piezoceramics and describe their fatigue behavior. It was also found that the unpoled samples exhibited higher fatigue resistance than the poled ones. The fatigue limit of maximum load for ten million cycles of unpoled and poled samples was estimated to be 160 and 135 MPa, respectively. The detailed observations of the fatigue fracture surfaces by scanning electron microscopy (SEM) indicated that a wavy surface with a mixture of transgranular and intergranular fractures occurred preferentially in the case of the poled material. On the other hand, transgranular fractures seem to be predominant in the unpoled samples. It appears that the poling process causes the change in failure characteristics due to domain orientation that leaves an anisotropic stress field in the material. The poled ceramics possess a local stress concentration created by the orientation under the electric poling field of the 90° ferroelectric–ferroelastic domains. Under this local stress concentration, a microstructural degeneration is induced by domain switching under the cyclic load that accelerates crack growth, thereby reducing fatigue lifetime.

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