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Damage detection in foam core sandwich structures using guided waves

  • N. TerrienEmail author
  • D. Osmont
Part of the Springer Proceedings in Physics book series (SPPHY, volume 128)

Abstract

Sandwich structures, consisting of two face sheets and an intermediate foam core, have a high potential in aerospace applications. However, they are rarely used because it is difficult to inspect them by the conventional non-destructive techniques. Indeed, non visible damage of the sandwich face sheets can in fact be accompanied by a large skin/foam core delamination. This paper describes a new approach to detect sub-interface damage in such structures by using ultrasonic guided waves. These waves are excited with a PZT disc permanently bonded on the structure and their interaction with foam core damages is detected by scanning the structure with an air-coupled transducer. To carry out this monitoring technique, the first step was to analyse the propagation of waves guided in such sandwiches with both numerical and experimental tools. This allowed selecting the specific waves and their frequency which will be the most sensitive to skin/foam core delaminations and to make easier the interpretation of the measured waveforms. Finally, an adapted signal processing was implemented in order to localize and to characterize delaminations in sandwich panels.

Keywords

Signal Processing High Potential Sandwich Structure Damage Detection Monitoring Technique 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  1. 1.ONERA, DMSC/CS2Châtillon cedexFrance

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