研究目的
To propose and theoretically design piezoelectric composites with a core-shell structure to achieve high displacement response under low applied electric fields.
研究成果
The core-shell structural design in piezoelectric composites significantly enhances displacement response under low applied electric fields, with up to 25 times improvement over pure ceramics. This is achieved by optimizing shell volume fraction, core dielectric permittivity, and Young's modulus, leveraging enhanced local electric fields and easier deformation.
研究不足
The study is theoretical and based on simulations, not experimental validation. It assumes linear piezoelectric effects and ignores electrostriction, which may not hold in real materials. The core materials are artificially created and may not be practically achievable.
1：Experimental Design and Method Selection:
A finite element method (FEM) is used to simulate the distribution of local electric field and displacement response in piezoelectric composites with core-shell structures. The design involves a core of non-piezoelectric material and a shell of piezoelectric material, with simulations assuming linear piezoelectric effects and ignoring electrostriction.
2：Sample Selection and Data Sources:
The computational region is a square with a side length of 60 μm, generated using Voronoi tessellation with an average grain size of ~5 μm and shell volume fractions ranging from 5% to 20%. Barium titanate (BT) is used as the piezoelectric shell material, with material parameters preset in COMSOL Multiphysics based on Auld's book. The core material is artificially created with specified dielectric permittivity and Young's modulus.
3：0%. Barium titanate (BT) is used as the piezoelectric shell material, with material parameters preset in COMSOL Multiphysics based on Auld's book. The core material is artificially created with specified dielectric permittivity and Young's modulus. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: COMSOL Multiphysics
4：3 software is used for simulations. No physical equipment is mentioned as it is a theoretical study. Experimental Procedures and Operational Workflow:
The bottom boundaries are fixed and connected to a positive electrode, while the top boundaries are free and grounded. Simulations vary shell volume fraction (0-20%), core dielectric permittivity (5000-20000), core Young's modulus (
5：01-10 GPa), and applied electric field (1-6 kV/mm). Data Analysis Methods:
Results are analyzed through plots of maximum displacement as functions of various parameters, and local electric field distributions are examined using relative electric field calculations.
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