Nonlinear elastic imaging using reciprocal time reversal and third order symmetry analysis

Francesco Ciampa, Michele Meo

Research output: Contribution to journalArticle

37 Citations (Scopus)
71 Downloads (Pure)

Abstract

This paper presents a nonlinear imaging method for the detection of the nonlinear signature due to impact damage in complex anisotropic solids with diffuse field conditions. The proposed technique, based on a combination of an inverse filtering approach with phase symmetry analysis and frequency modulated excitation signals, is applied to a number of waveforms containing the nonlinear impulse responses of the medium. Phase symmetry analysis was used to characterize the third order nonlinearity of the structure by exploiting its invariant properties with the phase angle of the input waveforms. Then, a “virtual” reciprocal time reversal imaging process, using only one broadcasting transducer and one receiving transducer, was used to insonify the defect taking advantage of multiple linear scattering as mode conversion and boundary reflections. The robustness of this technique was experimentally demonstrated on a damaged sandwich panel, and the nonlinear source, induced by low-velocity impact loading, was retrieved with a high level of accuracy. Its minimal processing requirements make this method a valid alternative to the traditional nonlinear elastic wave spectroscopy techniques for materials showing either classical or non-classical nonlinear behavior.
Original languageEnglish
Pages (from-to)4316-4323
JournalJournal of the Acoustical Society of America
Volume131
Issue number6
DOIs
Publication statusPublished - 2012

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transducers
waveforms
impact damage
broadcasting
symmetry
elastic waves
low speed
impulses
phase shift
nonlinearity
signatures
requirements
defects
scattering
spectroscopy
excitation
Imaging
Symmetry
Damage
Impulse

Cite this

Nonlinear elastic imaging using reciprocal time reversal and third order symmetry analysis. / Ciampa, Francesco; Meo, Michele.

In: Journal of the Acoustical Society of America, Vol. 131, No. 6, 2012, p. 4316-4323.

Research output: Contribution to journalArticle

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