Method for analyzing and predicting strength of crack-containing ferroelectric material under effect of force-electricity-heat coupling field

A technology of ferroelectric materials and prediction methods, applied in chemical property prediction, computer material science, cheminformatics data warehouse, etc., can solve the lack of systematic research, the inability to simulate the evolution of ferroelectric microstructure, and the inability to accurately reflect the physical essence and other problems, to achieve good adaptability and stability, simple process effect

Inactive Publication Date: 2020-05-05
CHANGZHOU INST OF TECH
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Problems solved by technology

[0006] (2) There is a lack of systematic research on the ferroelectric domain transformation of cracked ferroelectric materials under the action of mechanical-electric-thermal complex external electric field, the movement of domain walls, the evolution of microstructure and the distribution of stress field at the crack tip.
Therefore, there is a problem that it can

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  • Method for analyzing and predicting strength of crack-containing ferroelectric material under effect of force-electricity-heat coupling field
  • Method for analyzing and predicting strength of crack-containing ferroelectric material under effect of force-electricity-heat coupling field
  • Method for analyzing and predicting strength of crack-containing ferroelectric material under effect of force-electricity-heat coupling field

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] The elliptical crack in the ferroelectric material is simulated as an electric inclusion model, that is, the inside of the crack is simulated by an electric inclusion with the same dielectric constant as water, silicone oil or air. In order to focus on the influence of external loads on ferroelectric materials, the electric inclusions here only consider the electric energy, ignoring the influence of small elastic energy; at the same time, it is assumed that the electric inclusions have good dielectric properties, and the influence of temperature changes on the dielectric properties of the electric inclusions is ignored. Constant influence. The invention provides a powerful finite element simulation method, by studying the interaction between electric inclusions and microstructures, the electric hysteresis loops of different electric inclusion models ar...

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Abstract

The invention discloses a method for analyzing and predicting the strength of a crack-containing ferroelectric material under the effect of a force-electricity-heat coupling field. The method comprises the steps: building a new phase field model of multi-field coupling by considering oval cracks in the ferroelectric material as electric inclusions; solving a force-electricity-heat multi-field coupling problem of crack-containing ferroelectric single crystal; giving hysteresis loops of different electric inclusion models, and controlling the dielectric constant of electric inclusion to improvethe material performance or prevent degradation of the material performance; and obtaining domain structures and stress field distribution of ferroelectric single crystals of different electric inclusion models under the effect of a given electromechanical load in different temperature environments. According to the method disclosed by the invention, the correlation between the evolution of the micro domain structure and the macroscopic local stress concentration of the crack-containing ferroelectric material under the action of the force-electricity-heat coupling field is uniformly expressedby using the effective model. Therefore, a theoretical basis is provided for structural safety design and health prediction of a ferroelectric component under a complex or extreme environmental load.

Description

technical field [0001] The invention relates to a method for analyzing and predicting the strength of a crack-containing ferroelectric material, in particular to a method for analyzing and predicting the strength of a crack-containing ferroelectric material under the action of a force-electricity-thermal coupling field. Background technique [0002] Ferroelectric materials such as BaTiO 3 , PbTiO 3 , PZT, etc., due to its inherent electromechanical coupling effect and rapid response, has become a research hotspot for new functional materials and components. However, ferroelectric materials are mostly brittle materials, and defects such as microcracks will inevitably occur during the preparation process. The existence of these defects destroys the geometric or physical continuity of the structure, and local stress concentration and electric field concentration will occur near the discontinuity area, resulting in mechanical failure of materials and structures, which has attr...

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Application Information

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IPC IPC(8): G16C60/00G16C20/30G16C10/00G16C20/90
CPCG16C10/00G16C20/30G16C20/90G16C60/00
Inventor 黄成祁霄陈良友孙晓峰武之炜
Owner CHANGZHOU INST OF TECH
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