Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Experimental study of fatigue crack propagation monitoring using Acoustic Emission
Submission Author:
Beatriz Marangoni , MG
Co-Authors:
Beatriz Marangoni, Fernanda Beatriz Aires de Freitas, Larissa Pereira, leandro stival, Aldemir Ap Cavalini Jr, Valder Steffen Jr
Presenter: Beatriz Marangoni
doi://10.26678/ABCM.COBEM2023.COB2023-0645
Abstract
Acoustic Emission (AE) is one of the structural integrity monitoring (SHM) techniques that in recent years has been used for monitoring and fault diagnosis. Given this, this technique is capable of detecting the growth of defects in real-time using a high-sensitivity sensor. In AE applications, different characteristics extracted from elastic waves (such as count, peak amplitude, energy, rise time, duration, etc.) are used to diagnose the damage to the analyzed material. Due to this high effectiveness in identifying failures, AE was applied in this work to monitor the propagation of a fatigue crack in a 1020 steel beam. Three AE sensors were used, coupled to a 25.4 mm thick beam, 850 mm long and 50.8 mm wide, subjected to fatigue due to variable excitation caused by an eccentric disc motor. A “V” notch was made on this beam to facilitate crack propagation (stress concentrator). According to the analysis of the acquired signals, it was possible to identify the growth of the fatigue crack from different parameters of the AE waves. The preliminary results obtained showed that the EA technique was effective in structural monitoring to predict material fatigue failure.
Keywords
Fatigue crack, structural integrity, acoustic emission
