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Effects of grain shape anisotropy, porosity, and microcracks on the elastic and dielect...
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Effects of grain shape anisotropy, porosity, and microcracks on the elastic and dielectric constants of polycrystalline piezoelectric ceramics
作者:
Martin L. Dunn,
期刊:
Journal of Applied Physics
(AIP Available online 1995)
卷期:
Volume 78,
issue 3
页码: 1533-1541
ISSN:0021-8979
年代: 1995
DOI:10.1063/1.360246
出版商: AIP
数据来源: AIP
摘要:
A theoretical approach is proposed to estimate the effects of grain shape anisotropy on the overall response of polycrystalline piezoelectric ceramics. The self‐consistent approach is applicable to a polycrystal with arbitrary grain shapes, orientations, and anisotropy, but emphasis is placed on the effective bulk and shear moduli and the dielectric constant of a polycrystal consisting of randomly oriented piezoelectric grains. Because typical piezoelectric ceramics often contain substantial porosity, the effects of randomly oriented pores of various shapes on the overall electroelastic properties are considered. Analytical predictions are compared to simplified predictions which ignore the effects of piezoelectricity at the grain level and the effects of grain shape. Analytical predictions are in good agreement with measurements for unpoled, porous BaTiO3polycrystals. AFORTRANcomputer program developed to implement the theory is available upon request from the author. ©1995 American Institute of Physics.
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