Damage detection in honeycomb sandwich panels by active thermography

Sefa K. Mandal, Jamal S.M. Zanjani, Mehmet Yildiz

Research output: Contribution to conferencePaperpeer-review

Abstract

Infrared thermography is one of the effective non-destructive testing methods for damage characterization and identification in structural materials. Infrared thermography induces a temperature variation on the specimen and monitors the surface temperature to detect defects deep inside the structure. It offers advantages such as being non-contact inspect method, scanning large surface area and recording in real time. Although various techniques have been developed for infrared thermography, lock-in thermography (LT) and pulse thermography (PT) are the most preferred ones due to their rapid detection, in-service applicability. LT method uses a sinusoidal heat waves in different frequencies whereas PT, employs an instantaneous heat pulses to excite the specimen temperature and monitor its evolution to identify the defects and manufacturing flaws. In this study, both lock-in and pulse active thermography methods are used to detect different type of defects namely delamination, liquid ingress and debonding in a glass/phenolic prepreg with NomexTM honeycomb core sandwich composites which is a widely used material in aviation industry. The results are presented comparatively on the basis of advantages and disadvantages.

Original languageEnglish
Publication statusPublished - 2019
Event22nd International Conference on Composite Materials, ICCM 2019 - Melbourne, Australia
Duration: 11 Aug 201916 Aug 2019
Conference number: 22

Conference

Conference22nd International Conference on Composite Materials, ICCM 2019
Abbreviated titleICCM 2019
CountryAustralia
CityMelbourne
Period11/08/1916/08/19

Keywords

  • Infrared thermography
  • Nomex honeycomb
  • Non-destructive testing
  • Phenolic resin
  • Sandwich structure

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