1. Nonlinear coda wave interferometry for the global evaluation of damage levels in complex solids
- Author
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Alain Le Duff, Stéphane Letourneur, Vincent Tournat, Odile Abraham, Yuxiang Zhang, Olivier Durand, Bertrand Lascoup, Laboratoire d'Acoustique de l'Université du Mans (LAUM), Centre National de la Recherche Scientifique (CNRS)-Le Mans Université (UM), Département Mesure, Auscultation et Calcul Scientifique (IFSTTAR/MACS), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-PRES Université Nantes Angers Le Mans (UNAM), ESEO - Groupe Radio et Hyperfréquences, ESEO-Tech, Université Bretagne Loire (UBL)-Université Bretagne Loire (UBL), IRT Jules Vernes, Laboratoire Géophysique et évaluation non destructive (IFSTTAR/GERS/GeoEND), Laboratoire d'acoustique de l'université du Mans ( LAUM ), Le Mans Université ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Géophysique et évaluation non destructive ( IFSTTAR/GERS/GeoEND ), and Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux ( IFSTTAR ) -PRES Université Nantes Angers Le Mans ( UNAM )
- Subjects
INTERFEROMETRIE ,Acoustics and Ultrasonics ,Acoustics ,Coda wave interferometry ,01 natural sciences ,Coda ,[SPI]Engineering Sciences [physics] ,Nonlinear acoustics ,Nonlinear wave modulation ,0103 physical sciences ,[ SPI ] Engineering Sciences [physics] ,[ SPI.GCIV ] Engineering Sciences [physics]/Civil Engineering ,010301 acoustics ,ONDE ,Parametric statistics ,010302 applied physics ,Physics ,Scattering ,ULTRASON ,ONDE SISMIQUE ,[SPI.GCIV]Engineering Sciences [physics]/Civil Engineering ,Interferometry ,Nonlinear system ,ACOUSTIQUE ,Ultrasonic sensor ,Nonlinear scattering ,Global evaluation of damage level - Abstract
A nonlinear acoustic method to assess the damage level of a complex medium is discussed herein. Thanks to the highly nonlinear elastic signatures of cracks or, more generally, internal solid contacts, this method is able to distinguish between contributions from linear wave scattering by a heterogeneity and contributions from nonlinear scattering by a crack or unbounded interface. The coda wave interferometry (CWI) technique is applied to reverberated and scattered waves in glass plate samples featuring various levels of damage. The ultrasonic coda signals are recorded in both the absence and presence of an independent and lower-frequency elastic “pump” wave, before being analyzed by CWI. The monitored CWI parameters quantifying changes in these coda signals, which therefore quantify the nonlinear wave-mixing effects between the coda and pump waves, are found to be dependent on the damage level in the sample. A parametric study is also performed to analyze the influence of sensor positions and average temperature on the method’s output. The reported results could be applied to the non-destructive testing and evaluation of complex-shape materials and multiple scattering samples, for which conventional ultrasonic methods show strong limitations.
- Published
- 2017
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