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    IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
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    Summary

    This study models nonlinear behavior in layered surface acoustic wave (SAW) resonators using finite element computations. It addresses incomplete material data with scaling factors, validating results with third-order nonlinearity measurements.

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    Area of Science:

    • Materials Science
    • Solid State Physics
    • Acoustics

    Background:

    • Nonlinear behavior in layered surface acoustic wave (SAW) resonators is crucial for device performance.
    • Accurate higher-order material constants are essential for nonlinear simulations but often unavailable.

    Purpose of the Study:

    • To investigate the nonlinear behavior of layered SAW resonators using finite element (FE) computations.
    • To develop a method for handling incomplete higher-order material tensor data in simulations.

    Main Methods:

    • Utilized finite element (FE) computations to model nonlinear behavior.
    • Employed scaling factors as phenomenological estimates for incomplete nonlinear material tensors (up to fourth order).
    • Applied an isotropic approximation for fourth-order elastic constants of LiTaO3.

    Main Results:

    • The fourth-order elastic tensor was found to be dominated by a single fourth-order Lamé constant.
    • The FE model successfully investigated third-order nonlinearity in layered SAW resonators.
    • Model predictions were validated against experimental measurements of third-order effects.

    Conclusions:

    • The developed FE approach effectively models nonlinear SAW resonator behavior despite incomplete material data.
    • Scaling factors provide a viable method for estimating missing higher-order material constants.
    • Understanding nonlinear effects is critical for advanced SAW resonator design.