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Related Experiment Videos

Acoustoelastic effect in stressed heterostructures.

Alexander Vladimirovich Osetrov1, Heinz-Jürgen Fröhlich, Reinhold Koch

  • 1St Petersburg State Electrotechnical University, Russia.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|February 9, 2002
PubMed
Summary

The acoustoelastic (AE) effect, where mechanical stress alters acoustic wave velocity, was calculated for biaxially stressed layered systems. The study found the AE effect is direction-dependent and can change sign, with maximal velocity changes for specific wave types and propagation directions.

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Area of Science:

  • Acoustics
  • Solid Mechanics
  • Materials Science

Background:

  • Mechanical stresses significantly impact acoustic wave propagation, a phenomenon known as the acoustoelastic (AE) effect.
  • Understanding the AE effect in layered systems is crucial for non-destructive evaluation and material characterization.

Purpose of the Study:

  • To extend the transfer matrix method for calculating the AE effect in biaxially stressed layered systems.
  • To investigate the angular dispersion of the AE effect for transverse bulk modes and surface acoustic waves on Ge(001).
  • To analyze the AE effect for Love modes in layered Ge/Si(001) systems.

Main Methods:

  • Extended the transfer matrix method to account for density changes, residual stress, and modified elastic stiffness tensors due to strain and third-order constants.

Related Experiment Videos

  • Applied the generalized method to calculate the angular dispersion of the AE effect for various acoustic wave modes on Ge(001) and Ge/Si(001) systems.

    • Main Results:

    • The AE effect was found to be highly dependent on the wave propagation direction, with the potential to change sign.
    • Maximal velocity changes were observed for transversally polarized waves propagating along the [110] direction on Ge(001).
    • For layered Ge/Si(001) systems, the AE effect for Love modes increased with layer thickness and approached maximum values even with substrate penetration.

    Conclusions:

    • The extended transfer matrix method accurately predicts the AE effect in biaxially stressed layered systems.
    • The directionality and sign changes of the AE effect highlight the importance of considering stress state and propagation direction in acoustic wave analysis.
    • Layer thickness plays a critical role in the AE effect of Love modes in layered structures.