PSI - Issue 52

Alessandro De Luca et al. / Procedia Structural Integrity 52 (2024) 424–429 Alessandro De Luca / Structural Integrity Procedia 00 (2019) 000 – 000

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Undamaged config.

Damaged config.

Figure 6. Signal envelopes for directions a) parallel, b) orthogonal and c) oblique with respect to the load for the undamaged and damaged configurations 4. Conclusions In this work, GW propagation on an aluminium flat panel subjected to different levels of tensile loads (20, 30, 40 kN), each individually, using an electromechanical testing machine, the Zwick/Roell 250, equipped with a 250 kN load cell. Through a 5-PZT array, GW diagnostic signals were acquired along different measurement paths and analysed in terms of amplitude. Analysis of the data showed that the signal amplitudes increase as the load increases for the sensor path located along the load direction, whilst along the transversal direction the signal amplitude decreases as the load increases. Then, tests campaign was repeated under a combined damage and load scenario. Also in this case, it was observed that the signal amplitudes change but, under certain conditions, the effects of stress and damage can compensate each other, leading to false positives or false negatives. Acknowledgements This research study was carried out in the framework of the project “GENESIS— self-diaGnostic hydrogEN vESsel Integrity System”, funded by the University of Campania “Luigi Vanvitelli” as part of fundamental and applied research projects programme dedicated to young researchers. References [1] C.G. Soares, Y. Garbatov, Reliability of maintained, corrosion protected plates subjected to non-linear