Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Structural health monitoring of a fixed structure based on the ultrasonic technique
Submission Author:
Larissa Pereira , MG
Co-Authors:
Larissa Pereira, Fernanda Beatriz Aires de Freitas, Beatriz Marangoni, leandro stival, Valder Steffen Jr, Aldemir Ap Cavalini Jr
Presenter: Larissa Pereira
doi://10.26678/ABCM.COBEM2023.COB2023-0301
Abstract
The number of techniques used for fault detection or structural health monitoring has significantly increased in recent years, stimulated by concerns about damage to structures that can cause tragic accidents and high repair and maintenance costs. The Structural Health Monitoring (SHM) techniques can mitigate these problems because it is applied for incipient fault detection purposes, allowing for timely preventive measures, reducing maintenance costs, providing greater reliability and safety, and increasing the product's service life. Ultrasonic structural integrity monitoring is one of the most used non-destructive tests. Its applications include thickness measurement, identification of discontinuities, and evaluation of corrosion, with internal discontinuity evaluation being its primary application. The detection of discontinuities through an ultrasonic device is performed by monitoring the sonic reflections transmitted to the material through a transducer attached to the structure. A high-frequency sound beam is introduced into the material to be inspected, reflecting off interfaces and detected by the device, determining the presence or absence of discontinuities. In the present contribution, the ultrasonic technique was applied to a fixed structure, a 1020 steel beam with 44.45 mm thickness, 850 mm length, and 50.8 mm width, using conventional Ultrasonic transducers to identify damage in the structures and their growth. The beam was subjected to successive cuts in the same region, and the ultrasonic technique was used to monitor its propagation. For this aim, transducers with different angle heads (0°, 45°, 60°, and 70°) alongside the beam were used. Different from the commonly adopted procedure for discontinuity detection based on the ultrasonic technique, in this case, the transducers were kept fixed to follow the growth of the cuts in different positions. The preliminary results demonstrated that it was possible to identify the damage propagation using the proposed procedure. Therefore, it can be inferred that the technique can be effectively explored in different conditions.
Keywords
Structural Health Monitoring (SHM), Ultrasonic testing, Fault Detection
