Micromechanical modelling of switching phenomena in polycrystalline piezoceramics: application of a polygonal finite element approach

Computational Mechanics - Tập 48 - Trang 421-435 - 2011
K. Jayabal1, A. Menzel1,2, A. Arockiarajan3, S. M. Srinivasan3
1Department of Mechanical Engineering, Institute of Mechanics, TU Dortmund, Dortmund, Germany
2Division of Solid Mechanics, Lund University, Lund, Sweden
3Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai, India

Tóm tắt

A micromechanically motivated model is proposed to capture nonlinear effects and switching phenomena present in ferroelectric polycrystalline materials. The changing remnant state of the ferroelectric crystal is accounted for by means of so-called back fields—such as back stresses—to resist or assist further switching processes in the crystal depending on the local loading history. To model intergranular effects present in ferroelectric polycrystals, the computational model elaborated is embedded into a mixed polygonal finite element approach, whereby an individual ferroelectric grain is represented by one single irregular polygonal finite element. This computationally efficient coupled simulation framework is shown to reproduce the specific characteristics of the responses of ferroelectric polycrystals under complex electromechanical loading conditions in good agreement with experimental observations.

Tài liệu tham khảo

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