Correlation of Acoustic Emission and Fractographic Characteristics during Fatigue Crack Development
Proceedings of the 29th European Conference on Acoustic Emission Testing (EWGAE2010) 2010
Aleksandrs Urbahs, A Shaniavsky, Sergejs Doroško, Mukharbiy Banov

Traditional methods of non-destructive testing (NDT) are used to check the growth of fatigue cracks on the final stages of their development, but in some cases they do not ensure necessary safety level in the process of dangerous object operation. The early detection of fatigue cracks may be performed by method of acoustic emission (AE). This research was carried out for an aircraft undercarriage leg where a fatigue crack was grown from an artificial stress concentrator during cyclic loading. In the process of testing, the AE signals were continuously recorded. After disruption, the leg break was exposed to fractal analysis. The analysis showed that the crack was growing irregularly. Particularly, its development practically stopped for several times, which was related to the initial growth of multiple microcracks and their consecutive amalgamation. Then all microcracks merged into a single main crack. It was observed that the total AE reflects the main stages of fatigue crack development. Particularly, depending on the number of loading cycles, there have been revealed several stages that differed by various velocities of AE accumulation. AE velocity changes may be used to check failure initiation and main crack growth. It is also shown that during the stages of quick crack development, AE signals in the loading cycle gradually become regular, which may be used to check the dangerous growth of the main crack. On the final stage of testing, a residual strength test was carried out. It is shown that the measurement of AE activity makes it possible to observe the crack development when the object of research is exposed to step-by-step loading, besides it can be used to prevent bench overload during object disruption.


Atslēgas vārdi
acoustic emission, fractographic analysis, fatigue crack

Urbahs, A., Shaniavsky, A., Doroško, S., Banov, M. Correlation of Acoustic Emission and Fractographic Characteristics during Fatigue Crack Development. No: Proceedings of the 29th European Conference on Acoustic Emission Testing (EWGAE2010), Austrija, Vienna, 8.-10. septembris, 2010. Vienna: European Working Group on Acoustic Emission, 2010, 20.-27.lpp.

Publikācijas valoda
English (en)
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