Nonlinear elastic wave propagation and breathing-debond identification in a smart composite structure

Shirsendu Sikdar, Wim Van Paepegem, Wiesław Ostachowicz, Mathias Kersemans

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17 Citations (Scopus)


This paper addresses a problem on geometric-nonlinearity, due to the occurrence of breathing-debond in a smart composite structure (SCS). In order to solve the problem, elastic wave propagation based numerical simulations and laboratory experiments were carried out on SCS with baseplate – stiffener debonds. The frequency-domain analysis of the numerical and experimental signals shows that the presence of breathing-debond produces a prominent nonlinear response in terms of higher-harmonics. It was also noticed that the magnitudes of those harmonics significantly change with the increase in propagation distance. A baseline-free online breathing-debond source localization strategy is proposed that exclusively uses the changes in second harmonic magnitudes of the elastic wave signals registered at the sensor-networks in SCSs. The study was further extended for variable debond sizes and locations. It is observed that the proposed monitoring strategy is capable of localizing a wide range of breathing-debond sources in the SCSs.

Original languageEnglish
Article number108304
Number of pages12
JournalComposites Part B: Engineering
Early online date17 Aug 2020
Publication statusPublished - 1 Nov 2020
Externally publishedYes

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