研究目的
Investigating the forced vibration and control analysis of functionally graded graphene-polymer composites bonded with piezoelectric layers under strong electric fields.
研究成果
The study demonstrates that the stiffness and resonant frequencies of FG-GPL/polymer composite shells can be enhanced by varying the GPL distribution patterns and weight fractions. The nonlinear model predicts higher actuation authority than the linear model, allowing for effective vibration control with lower applied voltages. The results provide benchmark problems for future advances in the design of smart GPL/polymer composites.
研究不足
The study is limited to small displacement analysis and does not consider large displacement/rotation increments. The nonlinear model is suitable for quasi-static loading and applied electric fields not beyond the coercive limit of the material.
1:Experimental Design and Method Selection:
The study uses a modified Halpin-Tsai micromechanics model to evaluate the effective material properties of GPL/polymer composites and two rotationally invariant non-linear constitutive relations for electromechanical coupling. A four-node shell element based on the Reissner-Mindlin hypothesis is developed for analysis.
2:Sample Selection and Data Sources:
Different non-uniform gradient distributions of graphene platelets (GPLs) are assumed through the thickness direction of the composite shells.
3:List of Experimental Equipment and Materials:
The study involves GPL/polymer composites and piezoelectric layers (PZT 3203HD and PZT 3230HD) with specified material properties.
4:Experimental Procedures and Operational Workflow:
The finite element method is used to simulate the forced vibrations of the composite shells under mechanical and electrical loads, including active vibration control using negative velocity feedback control algorithm.
5:Data Analysis Methods:
The study performs time and frequency response analysis to evaluate the vibration response and damping characteristics of the composite shells.
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