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

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

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

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

Department of Mechanical Engineering

Research output: Chapter or section in a book/report/conference proceeding › Chapter in a published conference proceeding

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 language	English
Title of host publication	50th Annual Conference of the British Institute of Non-Destructive Testing 2011, NDT 2011 Held in conjunction with the Materials Testing Exhibition, MT 2011
Publisher	British Institute of Non-Destructive Testing
Number of pages	1
ISBN (Print)	9781618393432
Publication status	Published - 1 Jan 2011
Event	50th Annual Conference of the British Institute of Non-Destructive Testing 2011, BINDT 2011 - Telford, UK United Kingdom Duration: 13 Sept 2011 → 15 Sept 2011

Publication series

Name	50th Annual Conference of the British Institute of Non-Destructive Testing 2011, NDT 2011 Held in conjunction with the Materials Testing Exhibition, MT 2011

Conference

Conference	50th Annual Conference of the British Institute of Non-Destructive Testing 2011, BINDT 2011
Country/Territory	UK United Kingdom
City	Telford
Period	13/09/11 → 15/09/11

Funding

This work has been supported by ALSTOM POWER Switzerland and the Engineering and Physical Sciences Research Council via an Engineering Doctorate studentship for G. Ptaszek in the UK Research Centre for NDE (RCNDE).

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.

Artificial disbonds for calibration of transient thermography inspection of thermal barrier coating systems. / Ptaszek, G.; Cawley, P.; Almond, D. et al.
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, 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).

Research output: Chapter or section in a book/report/conference proceeding › Chapter in a published conference proceeding

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, 50th Annual Conference of the British Institute of Non-Destructive Testing 2011, BINDT 2011, Telford, UK United Kingdom, 13/09/11.

Ptaszek G, Cawley P, Almond D, Pickering S. 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. British Institute of Non-Destructive Testing. 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).

Ptaszek, G. ; Cawley, P. ; Almond, D. et al. / Artificial disbonds for calibration of transient thermography inspection of thermal barrier coating systems. 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, 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).

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

Abstract

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