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Defect characterization by inductive heated thermography

: Noethen, M.; Meyendorf, N.


Thompson, D.O. ; American Institute of Physics -AIP-, New York:
Review of progress in quantitative nondestructive evaluation. Vol.31. Pt.A : 38th Annual Review of Progress in Quantitative Nondestructive Evaluation, University of Vermont, Burlington, VT, U.S.A, July 17-22, 2011
Woodbury, NY: AIP Press, 2012 (AIP Conference Proceedings 1430)
ISBN: 978-0-7354-1014-5
ISBN: 978-0-7354-1013-8
ISBN: 0-7354-1013-5
Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE) <38, 2011, Burlington/Vt.>
Fraunhofer IZFP, Institutsteil Dresden ( IKTS-MD) ()

During inductive-thermographic inspection, an eddy current of high intensity is induced into the inspected material and the thermal response is detected by an infrared camera. Anomalies in the surface temperature during and after inductive heating correspond to inhomogeneities in the material. A finite element simulation of the surface crack detection process using active thermography with inductive heating has been developed. The simulation model is based on the finite element software ANSYS. The simulation tool was tested and used for investigations on steel components with different longitudinal orientated cracks, varying in shape, width and height. This paper focuses on surface connected longitudinal orientated cracks in austenitic steel. The results show that depending on the excitation frequency the temperature distribution of the material under test are different and a possible way to measure the depth of the crack will be discussed.