Transactions of Nanjing University of Aeronautics & Astronautics
Temperature-Dependence of Microstructure Evolution in a Ferroelectric Single Crystal with Conducting Crack
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Abstract:
The different temperature-induced nonlinear behavior near a conducting crack tip in a ferroelectric single crystal is studied based on a phase field approach containing the time-dependent Ginzburg-Landau equation. Since domain switching in a crack tip plays an important role in the fracture behavior, by using three-dimensional nonlinear finite element method, the temperature-induced domain switching behavior of a ferroelectric single crystal is simulated under applied electrical and mechanical loads. The simulations show that increasing the temperature will enhance the crack propagation under a strong electric field, which results in switching-weakening. In particular, increasing the temperature from 300°C to 600°C will impede the crack propagation under combined mechanical and electric field loading, which results in switching-toughening. Salient features of the results are consistent with many experimental observations.
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We thank the support from the National Natural Science Foundation of China (11232007). Thanks also go to Prof. Zhang Tongyi for helpful discussions to improve the present work.
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