Eddy-current induced thermography—probability of detection study of small fatigue cracks in steel, titanium and nickel-based superalloy
Source abstract
Abstract
Abstract Eddy-current induced thermography (induction thermography, hereon referred to as eddytherm) is an active thermographic method which is capable of rapid and non-contacting detection of out-of-plane cracks in electrically conductive parts. In an eddytherm inspection, the part is induction heated; cracks cause localised changes in the induced eddy-current flow and the associated Joule heating is imaged at the surface of the part with an infrared camera. In this study the detectability of fatigue cracks in steel, titanium and Waspaloy is quantified by novel but simple image processing routines which are specifically applicable to eddytherm inspection. The quantitative detection data is then input into a cumulative log-normal probability of detection model to estimate the probability of detecting the fatigue cracks as a function of crack length. a90,95 (i.e., the crack length which can be detected 90% of the time with 95% confidence) is found to be 0.60 mm for steel, 0.78 mm for titanium and 1.50 mm for Waspaloy (a nickel-based superalloy), showing eddytherm to be an extremely sensitive method.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Thermography and Photoacoustic Techniques · Calibration and Measurement Techniques · Ultrasonics and Acoustic Wave Propagation
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (35)
Show source-provided references
1. BS EN 571-1. Non-destructive testing. Penetrant testing. General principles; 1997.
2. Nondestructive testing handbook
3. BS EN ISO 15549. Non-destructive testing. Eddy current testing. General principles ;2010.
4. Nondestructive testing handbook
5. Sonic infrared (IR) imaging and fluorescent penetrant inspection probability of detection (POD) comparison10.1063/1.2718008 ↗
6. Fluorescent penetrant inspection probability of detection demonstrations performed for space propulsion10.1063/1.1570359 ↗
7. Rummel · 1997
8. Mechanisms and models for crack detection with induction thermography10.1063/1.2902698 ↗
9. Modelling and evaluation of eddy current stimulated thermography10.1080/10589750903242533 ↗
10. Netzelmann U, Walle G. Induction thermography as a tool for reliable detection of surface defects in forged components. 2008; 177.
11. Thermographic crack detection by eddy current excitation10.1080/10589750701447920 ↗
12. Weekes B. Investigation of infrared thermography NDE techniques for use in power station environments, EngD thesis. London: Imperial College; 2011.
13. A calibration procedure for sonic infrared nondestructive evaluation10.1063/1.3169518 ↗
14. Lockin vibrothermal inspection of polymer composites
15. Infrared imaging of defects heat by a sonic pulse10.1063/1.1150630 ↗
16. Thermographic techniques for the detection of cracks in metallic components10.1784/insi.2011.53.11.614 ↗
17. NDT Resource Center. Penetrant testing materials. 〈http://www.ndt-ed.org/EducationResources/CommunityCollege/PenetrantTest/PTMaterials/ptmaterials.htm〉; [accessed 10.08.11].
18. Crack detection using pulsed eddy current stimulated thermography
19. Thermographic crack detection in ferritic steel components using inductive heating
20. Mathworks MATLAB documentation, Medfilt2. 〈http://www.mathworks.co.uk/help/toolbox/images/ref/medfilt2.html〉; [accessed 10.08.11].
21. Shepard D. A two-dimensional interpolation function for irregularly-spaced data. 1968;517–24.10.1145/800186.810616 ↗
22. Berens A. NDE reliability data analysis. In: Metals handbook Volume 17: Nondestructive evaluation and quality control, Materials park. Ohio: ASM International; 1988. p. 689–701.
23. Georgiou G. Probability of detection (POD) curves: derivation, applications and limitations, Research Report 454, Health and safety executive, prepared by Jacobi Consulting Limited; 2006.
24. Cramer · 1951
25. Lawless · 1982
26. Bushberg · 2006
27. Amplitude modulated lockin vibrothermography for NDE of polymers and composites10.1080/09349849609409580 ↗
28. Infrared imaging of defects heated by a sonic pulse10.1063/1.1150630 ↗
29. Prediction of the thermosonic signal from fatigue cracks in metals using vibration damping measurements10.1063/1.2361091 ↗
30. Detection of impact damage in CFRP composites by thermosonics10.1080/10589750701447540 ↗
31. Quantitative multi-inspection-site comparison of probability of detection for vibrothermography nondestructive evaluation data10.1007/s10921-011-0105-9 ↗
32. History of Penetrants: The First 20 Years, 1941–1961
33. 1971 · 5
34. US Department of Transportation/Federal Aviation Administration ANE-110. Damage tolerance for high energy turbine engine rotors. AC-33.14-1; 2001.
35. US Department of Transportation/Federal Aviation Administration AR-05/34. High-speed bolthole eddy-current scanning for in-service inspection of engine disks; 2005.