Artificial disbonds for calibration of transient thermography inspection of thermal barrier coating systems

G. Ptaszek, P. Cawley, D. Almond, S. Pickering

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Transient thermography is commonly used for the detection of disbonds in thermal barrier coatings (TBC). As for other NDT techniques, reference test specimens are required for calibration, but unfortunately, real disbonds are very difficult to use because it is difficult to control their size, and larger ones tend to spall. Flat bottomed holes are commonly used, but these over-estimate the thermal contrast obtained for a defect of a given diameter. This paper quantifies the differences in thermal response using finite element analysis validated by experiments, and proposes a form of artificial disbond that gives a better representation of the thermal responses seen with real defects. Real disbonds tend to have a non-uniform gap between the disbonded surfaces across the defect, and the effect of this on the thermal response is evaluated using finite element simulations. It is shown that the effect can be compensated for by adjusting the diameter of the calibration defect compared to the real defect.

Original languageEnglish
Title of host publication50th Annual Conference of the British Institute of Non-Destructive Testing 2011, NDT 2011 Held in conjunction with the Materials Testing Exhibition, MT 2011
PublisherBritish Institute of Non-Destructive Testing
Number of pages1
ISBN (Print)9781618393432
Publication statusPublished - 1 Jan 2011
Event50th Annual Conference of the British Institute of Non-Destructive Testing 2011, BINDT 2011 - Telford, UK United Kingdom
Duration: 13 Sep 201115 Sep 2011

Publication series

Name50th Annual Conference of the British Institute of Non-Destructive Testing 2011, NDT 2011 Held in conjunction with the Materials Testing Exhibition, MT 2011

Conference

Conference50th Annual Conference of the British Institute of Non-Destructive Testing 2011, BINDT 2011
CountryUK United Kingdom
CityTelford
Period13/09/1115/09/11

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials
  • Safety, Risk, Reliability and Quality
  • Materials Science (miscellaneous)

Cite this

Ptaszek, G., Cawley, P., Almond, D., & Pickering, S. (2011). Artificial disbonds for calibration of transient thermography inspection of thermal barrier coating systems. In 50th Annual Conference of the British Institute of Non-Destructive Testing 2011, NDT 2011 Held in conjunction with the Materials Testing Exhibition, MT 2011 (50th Annual Conference of the British Institute of Non-Destructive Testing 2011, NDT 2011 Held in conjunction with the Materials Testing Exhibition, MT 2011). British Institute of Non-Destructive Testing.