Effective permittivity of air-filled cracks in piezoelectric ceramics due to crack bridging

Neumeister, Peter; Jurisch, Martin; Jelitto, Hans; Engert, Andrea Raphaela; Schneider, Gerold A.; Balke, Herbert

doi:10.1016/j.actamat.2012.10.006

Cited by 7 publications

(4 citation statements)

References 22 publications

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“…The electric potential distributions observed by Kelvin Probe Force Microscopy have verified regions of higher electric potentials in cracks for both a PZT ceramic and BaTiO 3 single crystal. Not only high electric field strength was calculated in the crack tip region, an effective permittivity of approximately 40 times the permittivity of air was estimated for the crack medium in PZT [9,19]. For BaTiO 3 , the highly concentrated potential distribution was also found in the crack region in comparison to other regions [20].…”

Section: Discussionmentioning

confidence: 99%

Investigation of partial discharge in piezoelectric ceramics

et al. 2016

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Section: Discussionmentioning

confidence: 99%

Investigation of partial discharge in piezoelectric ceramics

et al. 2016

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“…For the type of fracture mechanics model considered here, even the grain structure of the material is neglected and straight cracks are assumed. However, it is observed in fracture experiments with PZT that the fracture surfaces have typically a roughness on the order of the grain size [31,32]. Hence, the characteristic dimensions being associated with crack bridging and, possibly, microcracking effects are probably determined by the grain size as well.…”

Section: Characteristic Size Of the Fpzmentioning

confidence: 96%

On the Prediction of R-Curves for Ferroelectroelastic Ceramics

Stark

Neumeister

Balke

2013

Journal of Applied Mechanics

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In ferroeiectroeiastic ceramics, the process of fracture is accompanied by significant inelastic deformation due to domain switching. This leads to an apparent toughening of the material, which is known as R-curve behavior. A promising approach to predict Rcwves is based on one parameter fracture criteria. The scope of this paper is the examination of the physical validity of these criteria for realistic material behavior. Besides a general discussion of the problem, fracture of the lead zirconate titanate ceramic PIC151 is examined. Thereby, restriction is made to purely mechanical material behavior. The results indicate that the usage of one parameter fracture criteria is questionable. This is due to a confiict between the length scale of the zone wherein the asymptotic crack tip singularity dominates in the field solution of the continuum model and the length scale associated with the fi-acture process zone. It is concluded that an incorporation of the fracture process into the used fracture mechanics model is necessary to capture transient fracture of ferroeiectroeiastic ceramics properly.

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“…Ricoeur A., Kuna M. [12] showed that usage of boundary condition ( 14) makes a substantial difference (about 10 %) in the intensity factors for the Griffith crack.…”

Section: Innovative Technologies In Development Of Construction Industrymentioning

confidence: 99%

Fracture Analysis of Piezoceramic CT-Specimen for Different Types of Crack Face Boundary Conditions

Ivashov

Семенов

2015

AMM

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At the moment a problem of fracture and lifetime estimation for piezoelectric materials is not completely solved. The paper considers fundamentals of linear fracture electromechanics, fracture parameters and fracture criteria. The main difference from linear mechanics is crack face boundary conditions taking into account relative permeability of media inside the crack gap and coulomb traction. Different types of crack face boundary conditions and their numerical implementation are described. The paper presents results of finite element modeling of fracture toughness experiments on the compact tension specimens under combined electromechanical loading. Different types of crack face boundary conditions were tested and comparison of fracture parameters and fracture criteria was carried out.

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Effective permittivity of air-filled cracks in piezoelectric ceramics due to crack bridging

Cited by 7 publications

References 22 publications

Investigation of partial discharge in piezoelectric ceramics

Investigation of partial discharge in piezoelectric ceramics

On the Prediction of R-Curves for Ferroelectroelastic Ceramics

Fracture Analysis of Piezoceramic CT-Specimen for Different Types of Crack Face Boundary Conditions

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