A Micromechanics Method to Study the Effect of Domain Switching on Fracture Behavior of Polycrystalline Ferroelectric Ceramics

CHENG Jin-quan; WANG Biao; DU Shan-yi

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Article Navigation > Applied Mathematics and Mechanics > 2002 > 23(11): 1113-1123

CHENG Jin-quan, WANG Biao, DU Shan-yi. A Micromechanics Method to Study the Effect of Domain Switching on Fracture Behavior of Polycrystalline Ferroelectric Ceramics[J]. Applied Mathematics and Mechanics, 2002, 23(11): 1113-1123.

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A Micromechanics Method to Study the Effect of Domain Switching on Fracture Behavior of Polycrystalline Ferroelectric Ceramics

Research Center of Composite Materials, Harbin Institute of Technology, Harbin 150001, P R China

Received Date: 2000-11-18
Rev Recd Date: 2002-07-15
Publish Date: 2002-11-15

Abstract

Abstract

The effect of domain switching on anisotropic fracture behavior of polycrystalline ferroelectric ceramics was revealed on the basis of the micromechanics method.Firstly,the electroelastic field inside and outside an inclusion in an infinite ferroelectric ceramics is carried out by the way of Eshelby-Mori-Tanaka.s theory and a statistical model,which accounts for the influence of domain switching. Further,the crack extension force(energy-release rate)G_ext for a penny-shape crack inside an effective polycrystalline ferroelectric ceramics is derived to estimate the averaged effect of domain switching on the fracture behavior of polycrystalline ferroelectric ceramics.The simulations of the crack extension force for a crack in a BaTiO₃ ceramics are shown that the effect of domain switching must be taken into consideration while analyzing the fracture behavior of polycrystalline ferroelectric ceramics.These results also demonstrate that the influence of the applied electric field on the crack propagation is more profound at smaller mechanical loading and the applied electric field may enhance the crack extension in a sense,which are consistent with the experimental results.
- ferroelectrics,
- domain switching,
- fracture behavior

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References(26)

References

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