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Proceedings Paper

Numerical modeling of frictional heating based vibrothermography
Author(s): Farid Mabrouki; Marc Thomas; Marc Genest; Abbas Fahr
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Paper Abstract

This paper investigates the use of finite element to model frictional heating based vibrothermography for the detection of fatigue cracks in steel specimens. First, a finite element modal analysis is carried out to predict the optimal excitation frequencies. Some thermographic experiments using an infrared camera are carried out to help updating a coupled thermo-mechanical model built to simulate the thermographic inspection process and to explain the heat generation and transfer related to it. Experimental investigations also confirmed that the technique is able to detect cracks as short as 0.1 mm. The developed model is able to simulate the thermographic inspection process with a maximum error of 2.13 % on the temperature distribution. The Fourier transform applied to numerical data reveals that the temperature evolution at the crack face changes according to the excitation frequency and is modulated due to the nonlinearity induced by the crack. The model also serves to confirm that the test is non-destructive since the calculated stress at the crack tip is less than the specimen material's yield stress.

Paper Details

Date Published: 8 April 2009
PDF: 10 pages
Proc. SPIE 7295, Health Monitoring of Structural and Biological Systems 2009, 72951F (8 April 2009); doi: 10.1117/12.815351
Show Author Affiliations
Farid Mabrouki, National Research Council Canada (Canada)
Ecole de Technologie Supérieure (Canada)
Marc Thomas, Ecole de Technologie Supérieure (Canada)
Marc Genest, National Research Council Canada (Canada)
Abbas Fahr, National Research Council Canada (Canada)

Published in SPIE Proceedings Vol. 7295:
Health Monitoring of Structural and Biological Systems 2009
Tribikram Kundu, Editor(s)

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