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Article dans une revue

Nonlinear elastic imaging with amplitude and frequency modulated low frequency sources

Abstract : The use of low frequency waves is the most practical means to investigate nonlinear elastic properties of hysteretic media, such as the strain dependence of wave velocity. Indeed, the rapid increase in damping as a function of frequency makes high frequency waves unable to provide sufficient strain energy to successfully excite nonlinearity. The drawback is that low frequency waves are not suitable for imaging, due to their long wavelength and resulting intrinsic averaging of nonlinear effects over large spatial scales. To address this, we propose here an amplitude modulation of swept sources that allows us to correlate the frequency at which harmonics are detected with the position of the source of nonlinearity, taking advantage of the different strain distributions in the sample at different frequencies.
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https://hal-univ-lemans.archives-ouvertes.fr/hal-02989183
Contributeur : Mourad Bentahar <>
Soumis le : jeudi 5 novembre 2020 - 09:39:02
Dernière modification le : lundi 17 mai 2021 - 12:34:58

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Mourad Bentahar, C. Mechri, M. Scalerandi. Nonlinear elastic imaging with amplitude and frequency modulated low frequency sources. Applied Physics Letters, American Institute of Physics, 2020, 117 (8), pp.084101. ⟨10.1063/5.0016357⟩. ⟨hal-02989183⟩

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