Application of the Fatigue Crack Opening/ Closing Effect for Aircraft SHM

7th International Symposium on NDT in Aerospace: Proceedings 2016
Vitālijs Pavelko

The effect of the Lamb wave interaction with fatigue crack in Al2024-T3 sheet at static and cyclic loading was investigated. Mentioned effect is associated with the crack opening/closing that change acoustic impedance of a crack. On-line and off-line measurement results are similar and very close one to other. The contrast between the behaviour of elastic waves at closed and opened crack enables to conduct online the reference-free SHM. Example of possible SHM system for monitoring of repaired skin of hermetic fuselage is proposed and its efficiency is demonstrated in a special test.

Keywords
Aerospace, aircraft, piezoseramic sensor, fatigue crack, crack opening/closing, mechanical load
Hyperlink
https://www.ndt-aerospace.com/Portals/aerospace2015/BB/tu2a2.pdf

Pavelko, V. Application of the Fatigue Crack Opening/ Closing Effect for Aircraft SHM. In: 7th International Symposium on NDT in Aerospace: Proceedings, Germany, Bremen, 16-18 November, 2015. Bremen: 2016, pp.1-8. ISSN 1435-4934.

Publication language
English (en)