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This is a In Vitro Study study (also classified as: Observational).

Nonlinear Frequency Mixing of Counter-Propagating Lamb Waves at a Contacting Interface of Plates

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Theory and measurements demonstrate mixed-frequency Lamb waves can detect closed defects in plates, suggesting a new inspection method.

The sum-frequency component generation indicates closed defects can be detected when scanning Lamb waves across the interface, enhancing defect characterization.
Measurements revealed that the amplitude of the sum-frequency component is proportional to the product of the primary-wave amplitudes, confirming theoretical predictions.
A theoretical model was developed for scanning the mixing zone of Lamb waves, aiding in the identification of defect locations in plates.
This research highlights innovative techniques for inspecting plate materials, potentially improving the reliability of structural assessments.

Biwa et al. (2025) studied this question.

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