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Use of Ultrasound Excited Thermography Applied to Massive Steel Components: Emerging Crack Detection Methodology

Plum, Robin 1; Ummenhofer, Thomas 1
1 Karlsruher Institut für Technologie (KIT)


In the field of nondestructive testing of structural components, active thermography methods are increasingly in demand. The most experience is available in testing of carbon-fiber-reinforced plastic (CFRP) or similar types of composite material. One of the emerging techniques is ultrasound excited thermography, which has not been fully transferred to massive steel members used in constructional steelwork thus far. The idea of ultrasound excitation is to generate elastic waves that propagate inside the investigated structure. In case of internal flaws, such as cracks, the boundary faces move relative to each other. The resulting rubbing and clapping of crack faces generate frictional heat, which is detected by means of an infrared camera. This paper demonstrates the usage of high-frequency mechanical excitation to detect cracks in hot-rolled girders and reduced plate specimens. The ultrasonic lock-in and the ultrasonic sweep thermography approaches are presented. Localized heating of the crack regions and distributed heating patterns caused by material damping can be observed. The influences of the tuned frequency and the crack depth as well as effects of prestressing and repeated excitation are discussed. ... mehr

DOI: 10.1061/(ASCE)BE.1943-5592.0000355
Zitationen: 8
Zitationen: 9
Zugehörige Institution(en) am KIT Versuchsanstalt für Stahl, Holz und Steine (VAKA)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2013
Sprache Englisch
Identifikator ISSN: 1084-0702
KITopen-ID: 1000035262
Erschienen in Journal of Bridge Engineering
Verlag American Society of Civil Engineers (ASCE)
Band 18
Heft 6
Seiten 455-463
Nachgewiesen in Dimensions
Web of Science
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