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Abstract

A method for detecting a defect in a region of interest within a part to be tested includes the step of,

for a reference part identical to the part to be tested but free from defects, determining a set of resonant modes each defining:a resonant frequency of the reference part, considering that the modulus of elasticity of the reference part is constant, anda field of mechanical stresses on and/or in the reference part that are generated when the reference part resonates at the resonant frequency. The method includesselecting the resonant mode, referred to as “optimum resonant mode”, that generates, in the region of interest, a maximum mechanical stress anddetermining a loading mode, referred to as “optimum” loading mode, that primarily activates the optimum resonant mode, a loading mode defining at least an excitation wave, an injection zone where the excitation wave is injected into the reference part, and an output zone where an output wave resulting from the excitation wave passing through from the injection zone to the output zone is picked up. The method includescarrying out nonlinear resonant spectrometry analysis based on the optimum loading mode, so as to determine a nonlinearity parameter for each of the part to be tested and reference part and classifying the part to be tested on the basis of the difference between the nonlinearity parameters for the part to be tested and for the reference part.”

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