A Proposal for Optimization of Crystal Orientations in Piezoelectric Ceramics by Multiscale Finite Element Analysis through Crystallographic Homogenization Method
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概要
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Polycrystalline piezoelectric ceramics have a large possibility to exhibit higher performance in a macroscopic scale by design of crystal morphology in a microscopic scale. In this paper, a multi-scale finite element method by using crystallographic homogenization theory has been applied to a typical piezoelectric ceramics, barium titanate (BaTiO3) in order to estimate macroscopic properties considering microscopic crystal morphology. Then, microscopic crystal orientation distribution has been optimized by steepest decent method to maximize macroscopic piezoelectric strain constant d333. Computational results indicated that BaTiO3 polycrystal consisting of three layers with different crystal orientations has the highest piezoelectric performance d333=258 pC/N, that is beyond single crystal because of mechanical effect in microscopic inhomogeneous structure.
- 一般社団法人 日本機械学会の論文
著者
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UETSUJI Yasutomo
Department of Mechanical Engineering, Osaka Institute of Technology
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Nakamachi Eiji
Department Of Mechanical Engineering Osaka Institute Of Technology
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Uetsuji Yasutomo
Department Of Mechanical Engineering Osaka Institute Of Technology
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Tsuchiya Kazuyoshi
Department Of Precision Engineering Tokai University
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HORIO Mitsuteru
Graduate School of Engineering, Osaka Institute of Technology
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