Journal
NONDESTRUCTIVE TESTING AND EVALUATION
Volume 25, Issue 3, Pages 205-218Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/10589750903242533
Keywords
eddy current thermography; induction thermography; finite element modelling
Funding
- EPSRC, UK Research Centre in NDE
- Engineering and Physical Sciences Research Council [EP/F022522/1, EP/F023324/1] Funding Source: researchfish
- EPSRC [EP/F022522/1, EP/F023324/1] Funding Source: UKRI
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Thermographic inspection with eddy current (EC) excitation is an emerging integrative NDTE method with the ability to inspect for defects over large areas. The resultant surface heat distribution from direct EC heating and diffused heat can be obtained easily with a thermal camera, but techniques for the determination of heating mechanisms around a particular defect for quantitative defect characterisation are required. In this paper, numerical modelling and experimental studies are applied to understand EC stimulated thermography on simple discontinuity defects, including transient EC distribution and heating propagation for slots and notches. This fundamental understanding of transient EC distribution and heating propagation will aid in the development of feature extraction and pattern recognition techniques for the quantitative analysis of EC thermography images and defect characterisation.
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