Multiscale Numerical Study on Polycrystalline Ferroelectric Solids

Abstract eng:
A multiscale finite element modelling is presented for polycrystalline ferroelectric materials with MPB (morphotropic phase boundary). The purpose of this study is to reveal nonlinear behaviors caused by domain switching and structural phase transition. The homogenization theory was employed for scale-bridging between macrostructure and microstructure. Crystal morphologies, which were characterized as an inhomogeneous structure composed of many grains and domains with individual orientations, were modeled at a microscopic scale. Then nonlinear response of the macrostructure was evaluated through monitoring microstructural crystal morphology change. The proposed simulation was applied to a polycrystalline PZT (lead zirconate titanate) at MPB.

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