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Detecting and Monitoring Cracks in Aerospace Materials Using Post-Processing of TSA and AE Data

1
School of Engineering, University of Liverpool, The Quadrangle, Brownlow Hill, Liverpool L69 3GH, UK
2
Cardiff University School of Engineering, Cardiff University, Queens Building, The Parade, Cardiff CF24 3AA, UK
3
Strain Solutions Ltd., Dunston Innovation Centre, Dunston Road, Chesterfield, Derbyshire S41 8NG, UK
*
Author to whom correspondence should be addressed.
Metals 2019, 9(7), 748; https://doi.org/10.3390/met9070748
Received: 7 May 2019 / Revised: 20 June 2019 / Accepted: 26 June 2019 / Published: 4 July 2019
(This article belongs to the Special Issue Thermal Methods for Damage Evaluation of Metallic Materials)
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Abstract

Thermoelastic stress analysis (TSA) is a non-contact technique for measuring the distribution of stress in the surface of a component subject to cyclic loading by using a sensitive infrared camera. The stress concentrations indicative of a crack can be located and tracked using an optical flow method, allowing the position of the crack-tip to be identified at a given time. Acoustic emission (AE) has been used to validate the TSA algorithm. AE events from cracking, located using the Delta-T Mapping method, were detected several seconds before the TSA algorithm first detected cracking; however, TSA provided significantly more accurate location information. View Full-Text
Keywords: thermoelastic stress analysis; acoustic emission; optical flow; Delta-T Mapping; crack tracking thermoelastic stress analysis; acoustic emission; optical flow; Delta-T Mapping; crack tracking
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Supplementary material

  • Externally hosted supplementary file 1
    Doi: http://dx.doi.org/10.17638/datacat.liverpool.ac.uk/903
    Description: Raw data to accompany accepted manuscript: Detecting and monitoring cracks in aerospace materials using post-processing of TSA and AE data
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Middleton, C.A.; McCrory, J.P.; Greene, R.J.; Holford, K.; Patterson, E.A. Detecting and Monitoring Cracks in Aerospace Materials Using Post-Processing of TSA and AE Data. Metals 2019, 9, 748.

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