Ansatz zur Risserkennung in Stahlblechen anhand der Verzerrung von Lamb-Wellen


Medium: journal article
Language(s): de 
Published in: Bautechnik, , n. 6, v. 91
Page(s): 425-429
DOI: 10.1002/bate.201300086

Lamb-wave distortion as approach to detect cracks in steel plates

The work presented here examines fatigue of steel specimens based on harmonic-distortion of Lamb-waves. Cyclic tension load is applied on notched steel specimens until failure under Low-Cycle-Fatigue (LCF) occurs. The fatigue test is interrupted every 1000 load cycles. An actuator excites Lamb-waves with singular frequencies and frequency bands in a range from 1 to 500 kHz. After the Lamb-waves passed the notch they are recorded by a sensor. Analysing the spectra shows a declining of the average amplitude with increasing material fatigue. These results provide an approach to develop a robust crack detection methodology. A major advantage of such an approach is the ability to detect cracks at least shortly before they become visible without requiring reference measurements of the undamaged structure.

Keywords: fatigue, steel structures, structural health monitoring, crack detection, Lamb waves, harmonic-distortion
Available from: Refer to publisher


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