Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Detection of a Submillimeter Notch Type Defect at Multiple Orientations by a Lamb Wave A0 Mode at 550 kHz for Long Range Shm Applications

Version 1 : Received: 12 February 2024 / Approved: 12 February 2024 / Online: 13 February 2024 (07:49:31 CET)

A peer-reviewed article of this Preprint also exists.

Capineri, L.; Taddei, L.; Marino Merlo, E. Detection of a Submillimeter Notch-Type Defect at Multiple Orientations by a Lamb Wave A0 Mode at 550 kHz for Long-Range Structural Health Monitoring Applications. Sensors 2024, 24, 1926. Capineri, L.; Taddei, L.; Marino Merlo, E. Detection of a Submillimeter Notch-Type Defect at Multiple Orientations by a Lamb Wave A0 Mode at 550 kHz for Long-Range Structural Health Monitoring Applications. Sensors 2024, 24, 1926.

Abstract

The early detection of small cracks in large structures is a crucial requirement for the implementation of structural health monitoring (SHM) system with a low transducer density. This work presents the results of the analysis of scattering of a submillimeter notch type defect with semielliptical shape with a groove at constant width 100µm in a 4.1mm thick aluminum plate. The defect is investigated with an ultrasonic guided wave (UGW) A0 mode at 550 kHz to cover long range in a thick plate. The mode selection is obtained by interdigital transducers designed to operate with 5mm central wavelength. The novel contribution is the assessment of the scattering amplitudes at different orientations of the defect when the distance is large as 35 cm in pulse-echo mode or 70 cm in pitch-catch mode. The system model is based on Finite Element Model (FEM) simulations and the results are in good agreement with experimental tests. The detection of the defect is obtained by comparing the scattered signals from the defect with base line signals of the pristine laminate. The analysis of scattering features and the efficient excitation with a probing UGW show the potential implementation in real structural health monitoring (SHM) systems.

Keywords

interdigital transducers; structural health monitoring; submillimeter notch; scattering; long range; Lamb waves; FEM simulation

Subject

Engineering, Electrical and Electronic Engineering

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our Diversity statement.

Leave a public comment
Send a private comment to the author(s)
* All users must log in before leaving a comment
Views 0
Downloads 0
Comments 0


×
Alerts
Notify me about updates to this article or when a peer-reviewed version is published.
We use cookies on our website to ensure you get the best experience.
Read more about our cookies here.