Designing Cofired Multilayer Electrostrictive Actuators for Reliability

Winzer, S. R.; Shankar, Nachiket; Ritter, Andrew

doi:10.1111/j.1151-2916.1989.tb06069.x

Cited by 181 publications

(68 citation statements)

References 3 publications

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“…Instantaneous failure of piezoelectric devices can arise due to events like fracture of the entire device [7,8] or dielectric breakdown. [9±11] In contrast, fatigue is termed as the gradual degradation of material or device properties during cyclic loading.…”

Section: Introductionmentioning

confidence: 99%

Fatigue In Bulk Lead Zirconate Titanate Actuator Materials

2005

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Fatigue in ferroelectric ceramics is the gradual change of material properties with cyclic loading. It is caused by microscopic material modifications of mechanical or electrical origin. Due to the electromechanical coupling, both mechanisms can yield similar or even identical changes in properties. Macroscopically, a reduction of switchable polarization is anticipated and asymmetries in the macroscopic hysteresis curves arise due to charge carrier migration. This review elaborates on the multiple loading scenarios that lead to asymmetries in material response and loss in performance. The disparities between unipolar, bipolar, and mixed electromechanical loading are displayed. Possible microscopic origins are categorized. The strong similarities in the roles of microcracks, dielectric layers, and grain boundaries are worked out.

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Section: Introductionmentioning

confidence: 99%

Fatigue In Bulk Lead Zirconate Titanate Actuator Materials

2005

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“…Numerous investigations have been carried out during the past decades to understand the fracture behavior of multilayer actuators. Theoretical models have been developed for fracture mechanics analysis of multilayer ceramics based on the electrostrictive theory [34,43,99,131,137], the linear theory of piezoelectricity [38,67,98,126,139], and nonlinear approaches taking into account the ferroelectric and ferroelastic behaviors [24,53,72,146]. Using these models, the electromechanical fields can be analyzed near the electrode edge and some design criteria regarding the geometry of the actuators and electrodes can be proposed to reduce the probability of fracture from the electrode edge.…”

Section: Crack Initiation Patterns At Electrode Edges In Multilayer Fmentioning

confidence: 99%

Phase-Field Modeling of Fracture in Ferroelectric Materials

Abdollahi

Arias

2014

Arch Computat Methods Eng

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This paper presents a family of phase-field models for the coupled simulation of the microstructure formation and evolution, and the nucleation and propagation of cracks in single and polycrystalline ferroelectric materials. The first objective is to introduce a phase-field model for ferroelectric single crystals. The model naturally couples two existing energetic phasefield approaches for brittle fracture and ferroelectric domain formation and evolution. Simulations show the interactions between the microstructure and the crack under mechanical and electromechanical loadings. Another objective of this paper is to encode different crack face boundary conditions into the phase-field framework since these conditions strongly affect the fracture behavior of ferroelectrics. The smeared imposition of these conditions are discussed and the results are compared with that of sharp crack models to validate the proposed approaches. Simulations show the effects of different conditions and electromechanical loadings on the crack propagation. In a third step, the model is modified by introducing a crack non-interpenetration condition in the variational approach to fracture accounting for the asymmetric behavior in tension and compression. The modified model makes it possible to explain anisotropic crack growth in ferroelectrics under the Vickers indentation loading. This model is also employed for the fracture analysis of multilayer ferroelectric actuators, which shows the potential of the model for future applications. The coupled phase-field model is also extended to polycrystals by introducing realistic polycrystalline microstructures in the model.

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“…Interfacial fracture between piezoelectric actuators/sensors and elastic substrates presents an important concern in multilayer devices (Winzer et al, 1989;Furuta and Uchino, 1993;Kim and Jones, 1996), especially under mechanical and electric cyclic loading. Recent development of a new experimental technique by Du et al (2001) aims specifically at addressing this issue.…”

Section: Introductionmentioning

confidence: 99%

Interfacial cracks between piezoelectric and elastic materials under in-plane electric loading

Liu

Hsia

2003

Journal of the Mechanics and Physics of Solids

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Evaluation of crack tip driving force for interfacial cracks between piezoelectric actuators and elastic substrates is crucial to successful applications of smart materials and smart structures.Here the behavior of an interfacial crack between a piezoelectric material and an elastic material under in-plane electric loading is studied. The displacement mismatch along a bonded interface due to electric potential loading on the piezoelectric material is modeled by an array of uniformly distributed dislocations along the interface. Using Fourier transformation method, the governing equations are converted to an integral equation, which is then converted to a standard Hilbert problem. A closed form solution for stresses, electric field, and electric displacements along the bonded interface is obtained. The results agree very well with that from numerical simulations using the finite element method. The results show that the closed form solution is not only accurate for far field distributions of stresses and electric variables, but also accurate for the asymptotic distributions near the crack tip. The solution also suggests the likelihood of domain switch in the piezoelectric material near the crack tip.

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Designing Cofired Multilayer Electrostrictive Actuators for Reliability

Cited by 181 publications

References 3 publications

Fatigue In Bulk Lead Zirconate Titanate Actuator Materials

Fatigue In Bulk Lead Zirconate Titanate Actuator Materials

Phase-Field Modeling of Fracture in Ferroelectric Materials

Interfacial cracks between piezoelectric and elastic materials under in-plane electric loading

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