研究目的
To analyze the propagation behavior of Love-type wave in an exponentially graded piezoelectric-viscoelastic material (EGPVM) stratum lying over a functionally graded piezoelectric-viscoelastic material (FGPVM) substrate due to an impulsive point source at its interfacial surface.
研究成果
The study successfully derives frequency and damping equations for Love-type wave propagation in the composite structure. Key findings include the decrease in phase velocity with increasing wave number, the enhancing effects of piezoelectric constants and certain gradient parameters on phase velocity, and the suppressing effects on attenuation. The results are validated against classical Love wave equations and have potential applications in designing surface acoustic wave devices and sensors.
研究不足
The study is theoretical and assumes specific material properties and gradients; experimental validation is not provided. The analysis is limited to the selected materials and may not generalize to other composites. Higher-order effects and approximations are neglected in the solution.
1：Experimental Design and Method Selection:
The study uses analytical methods involving Green's function and boundary conditions to derive frequency and damping equations for Love-type wave propagation in a bimaterial layered structure.
2：Sample Selection and Data Sources:
Two piezoelectric-viscoelastic materials, Epoxy-BNKLBT for the EGPVM stratum and Epoxy-KNLNTS for the FGPVM substrate, are selected based on material properties from references (Li and Dunn, 2001; Kwok et al., 2010).
3：0). List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: No specific equipment or materials are listed; the study is theoretical and computational.
4：Experimental Procedures and Operational Workflow:
The procedure involves deriving electro-visco-mechanical field equations, applying Fourier transforms, solving using Green's function, and applying boundary conditions to obtain frequency and damping equations. Numerical computations are performed with assumed material parameters.
5：Data Analysis Methods:
Data is analyzed by solving the derived equations numerically and graphically illustrating phase velocity and attenuation coefficient against wave number.
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