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Microwave detection of third-order nonlinearities in fatigue cracks

Microwave detection of third-order nonlinearities in fatigue cracks

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The results of an experiment aimed at demonstrating the possibility of detecting third-order electromagnetic nonlinearities in tight fatigue cracks are described. The postulated non-linearity was found to exist in specimens of aluminium and stainless steel using a two-frequency system operating near 10 GHz. This phenomenon could prove to be useful for non-destructive evaluation.

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