Fatigue crack detection on structural steel members by using ultrasound excited thermography = Erkennung von Ermüdungsrissen in Stahlbauteilen durch ultraschallangeregte Thermografie

by Robin Marc Plum

Institution: Universität Karlsruhe
Year: 2015
Keywords: Non-destructive testing, steel, fatigue crack, ultrasound, infrared thermography
Record ID: 1109434
Full text PDF: http://digbib.ubka.uni-karlsruhe.de/volltexte/documents/3540568


Ultrasound excitation of structural steel members leads to localised energy dissipation at existent fatigue cracks and thus allows for thermographic flaw detection. Essential effects on the defect-selective heating such as flaw size, plate thickness, crack mouth opening or static preload are systematically investigated. Laser vibrometry measurements of the crack edges, theoretical modelling of frictional heating and numerical simulations contribute to the understanding of the involved physics.