514 結晶均質化法に基づく圧電弾性体のマルチスケールモデリング

概要

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The macroscopic ferroelectric properties of piezoelectric polycrystals are strongly affected by the microscopic non-homogeneous crystal structure. In our previous study, a multi-scale finite element procedure based on crystallographic homogenization method has been developed to estimate macroscopic properties considering distributions of crystal orientations. In this paper, the crystal orientation of barium titanate has been measured by EBSD (Electron Back Scatter Diffraction Patterns), and the experimental result has been introduced to the microscopic structure model. As the prediction of macroscopic properties depends on the sampling procedure of the experimental crystal orientation, the effects of number of sampling points and sampling area have been investigated. As a result, both effective values have been caught to estimate macroscopic ferroelectric properties.
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