期刊
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
卷 83, 期 -, 页码 142-153出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijsolstr.2016.01.007
关键词
Phase-field modeling; Relaxor ferroelectrics; Random field theory; Finite element methods
类别
资金
- Graduate School of Computational Engineering at Technische Universitat Darmstadt
- German Science Foundation in the framework of DFG [Xu121/1-2, SPP1599]
- 'Excellence Initiative' of the German Federal and State Governments
A mechanically coupled phase-field model is proposed for the first time to simulate the peculiar behavior of relaxor ferroelectrics. Based on the random field theory for relaxors, local random fields are introduced to characterize the effect of chemical disorder. This generic model is developed from a thermodynamic framework and the microforce theory and is implemented by a nonlinear finite element method. Simulation results show that the model can reproduce relaxor features, such as domain miniaturization, small remnant polarization and large piezoelectric response. In particular, the influence of random field strength on these features are revealed. Simulation results on domain structure and hysteresis behavior are discussed and compared with related experimental results. (C) 2016 Elsevier Ltd. All rights reserved.
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