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Title: Leaky guided waves in generic bars: Numerical prediction and experimental validation by means of ultrasonic underwater testing

Abstract

Guided Ultrasonic Waves (GUWs) are used in several industrial and civil applications for the non-destructive tests and inspection of mechanical waveguides immersed in fluids. As well known, the impedance mismatch at the fluid-structure interface causes the bulk waves traveling inside the waveguide to be partially refracted in the surrounding fluid. The leakage of bulk waves involves continuous energy radiation along the propagation direction, resulting in high attenuation rates and, consequently, reduced inspection ranges. In this work, the dispersion behaviour of leaky guided waves that propagate in immersed waveguides of general cross-section is investigated. To this end, a Semi-Analytical Finite Element (SAFE) method coupled with a 2.5D Boundary Element method (BEM) is used to extract the wave dispersion equation. The proposed formulation avoids the well known limitations of analytical methods in treating complex geometries as well as those of Finite Element-based methods in representing propagation processes in unbounded domains. Numerical and experimental results are presented, in which the dispersion curves are extracted for different bars of arbitrary shape immersed in water. The results obtained in this paper can be useful for the design of testing conditions in practical applications and to tune experimental set up.

Authors:
;  [1];  [2]
  1. Civil, Architectural and Environmental Engineering (CAEE) Department, Drexel University, 3141 Chestnut St., Philadelphia PA 19104 (United States)
  2. Dipartimento di Ingegneria Civile, Ambientale e dei Materiali (DICAM), Università degli Studi di Bologna, Viale Risorgimento 2, Bologna 40136 (Italy)
Publication Date:
OSTI Identifier:
22263812
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1581; Journal Issue: 1; Conference: 40. annual review of progress in quantitative nondestructive evaluation, Baltimore, MD (United States), 21-26 Jul 2013, 10. international conference on Barkhausen noise and micromagnetic testing, Baltimore, MD (United States), 21-26 Jul 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BOUNDARY ELEMENT METHOD; CROSS SECTIONS; DISPERSIONS; FORECASTING; INSPECTION; NONDESTRUCTIVE TESTING; ULTRASONIC WAVES; WAVEGUIDES

Citation Formats

Mazzotti, Matteo, Bartoli, Ivan, and Marzani, Alessandro. Leaky guided waves in generic bars: Numerical prediction and experimental validation by means of ultrasonic underwater testing. United States: N. p., 2014. Web. doi:10.1063/1.4864871.
Mazzotti, Matteo, Bartoli, Ivan, & Marzani, Alessandro. Leaky guided waves in generic bars: Numerical prediction and experimental validation by means of ultrasonic underwater testing. United States. https://doi.org/10.1063/1.4864871
Mazzotti, Matteo, Bartoli, Ivan, and Marzani, Alessandro. 2014. "Leaky guided waves in generic bars: Numerical prediction and experimental validation by means of ultrasonic underwater testing". United States. https://doi.org/10.1063/1.4864871.
@article{osti_22263812,
title = {Leaky guided waves in generic bars: Numerical prediction and experimental validation by means of ultrasonic underwater testing},
author = {Mazzotti, Matteo and Bartoli, Ivan and Marzani, Alessandro},
abstractNote = {Guided Ultrasonic Waves (GUWs) are used in several industrial and civil applications for the non-destructive tests and inspection of mechanical waveguides immersed in fluids. As well known, the impedance mismatch at the fluid-structure interface causes the bulk waves traveling inside the waveguide to be partially refracted in the surrounding fluid. The leakage of bulk waves involves continuous energy radiation along the propagation direction, resulting in high attenuation rates and, consequently, reduced inspection ranges. In this work, the dispersion behaviour of leaky guided waves that propagate in immersed waveguides of general cross-section is investigated. To this end, a Semi-Analytical Finite Element (SAFE) method coupled with a 2.5D Boundary Element method (BEM) is used to extract the wave dispersion equation. The proposed formulation avoids the well known limitations of analytical methods in treating complex geometries as well as those of Finite Element-based methods in representing propagation processes in unbounded domains. Numerical and experimental results are presented, in which the dispersion curves are extracted for different bars of arbitrary shape immersed in water. The results obtained in this paper can be useful for the design of testing conditions in practical applications and to tune experimental set up.},
doi = {10.1063/1.4864871},
url = {https://www.osti.gov/biblio/22263812}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1581,
place = {United States},
year = {Tue Feb 18 00:00:00 EST 2014},
month = {Tue Feb 18 00:00:00 EST 2014}
}