Ultrasonic Lamb wave-based debonding monitoring of advanced honeycomb sandwich composite structures

Shirsendu Sikdar, Wiesław Ostachowicz

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Honeycomb sandwich composites are extensively used in military shelters, aerospace structures, ground transportation structures, auto-racing bodies, ship panels, and other special purpose structures requiring lightweight construction materials. But debondings at the face-sheet-to-core junctions frequently occur due to the variable operating and loading conditions, which may menace the safety and overall integrity of the structural assembly. This paper aims to effectively identify such hidden debonding regions in these advanced structures, using Lamb wave-based monitoring technique. A semianalytical analysis of Lamb wave dispersion in a healthy sandwich structure is carried out to identify various Lamb modes and to study their propagation phenomenon. A combined finite element-based simulation and experimental analysis of Lamb wave propagation in sandwich panels (healthy and with debonding) are then carried out using piezoelectric transducer networks. It is observed that the presence of debonding significantly reduces the propagating Lamb wave mode amplitudes. A debonding detection algorithm, which uses the differential changes in Lamb mode amplitudes, is applied to efficiently identify single and multiple debonding regions in the structure.

Original languageEnglish
Article numbere12302
JournalStrain
Volume55
Issue number1
Early online date23 Oct 2018
DOIs
Publication statusPublished - 1 Feb 2019

Keywords

  • aramid honeycomb core
  • debonding
  • debonding index
  • dispersion
  • lamb wave
  • piezoelectric transducer
  • sandwich structure

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