scholarly journals Comparative Study of Coupling Techniques in Lamb Wave Testing of Metallic and Cementitious Plates

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4068 ◽  
Author(s):  
Santiago Vázquez ◽  
Jorge Gosálbez ◽  
Ignacio Bosch ◽  
Alicia Carrión ◽  
Carles Gallardo ◽  
...  
Keyword(s):  
Lamb Waves ◽  
Bulk Wave ◽  
Water Tank ◽  
Non Destructive Testing ◽  
Signal Identification ◽  
Destructive Testing ◽  
Good Correspondence ◽  
Coupling Techniques ◽  
Non Destructive ◽  
Experimental Dispersion

Lamb waves have emerged as a valuable tool to examine long plate-like structures in a faster way compared to conventional bulk wave techniques, which make them attractive in non-destructive testing. However, they present a multimodal and dispersive nature, which hinders signal identification. Oblique incidence is one of the most known methods to generate and receive Lamb waves and it is applied in different experimental arrangements with different types of sensors. In this work, several setups were conducted and compared to determine the optimal ones to launch and detect ultrasonic Lamb waves, especially in non-homogeneous specimens. The chosen arrangements were contact with angle beam transducers, immersion in a water tank, localised water coupling using conical containers and air coupling. Plates of two different materials were used, stainless steel and Portland cement mortar. Theoretical and experimental dispersion curves were compared to verify the existence of Lamb modes and good correspondence was achieved.

scholarly journals Non-Invasive Testing of Physical Systems Using Topological Sensitivity

2021 ◽  
Vol 11 (3) ◽  
pp. 1341
Author(s):  
María Higuera ◽  
José M. Perales ◽  
María-Luisa Rapún ◽  
José M. Vega
Keyword(s):  
Lamb Waves ◽  
General Purpose ◽  
Mathematical Tool ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Topological Sensitivity ◽  
Physical Systems ◽  
Non Invasive ◽  
Active Infrared Thermography ◽  
Non Destructive

A review of available results on non-destructive testing of physical systems, using the concept of topological sensitivity, is presented. This mathematical tool estimates the sensitivity of a set of measurements in some given sensors, distributed along the system, to defects/flaws that produce a degradation of the system. Such degradation manifests itself on the properties of the system. The good performance of this general purpose post-processing method is reviewed and illustrated in some applications involving non-destructive testing. These applications include structural health monitoring, considering both elastodynamic ultrasonic guided Lamb waves and active infrared thermography. Related methods can also be used in other fields, such as diagnosis/prognosis of engineering devices, which is also considered.

scholarly journals Study of Lamb Waves for Non-Destructive Testing Behind Screens

2018 ◽  
Vol 170 ◽  
pp. 03005 ◽  
Author(s):  
P. Kauffmann ◽  
M.-A. Ploix ◽  
J.-F. Chaix ◽  
C. Gueudré ◽  
G. Corneloup ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Lamb Waves ◽  
Nuclear Industry ◽  
Liquid Sodium ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Leaky Lamb Waves ◽  
Short Time ◽  
And Control ◽  
Non Destructive

The inspection and control of sodium-cooled fast reactors (SFR) is a major issue for the nuclear industry. Ultrasonic solutions are under study because of the opacity of liquid sodium. In this paper, the use of leaky Lamb waves is considered for non-destructive testing (NDT) on parallel and immersed structures assimilated as plates. The first phase of our approach involved studying the propagation properties of leaky Lamb waves. Equations that model the propagation of Lamb waves in an immersed plate were solved numerically. The phase velocity can be experimentally measured using a two dimensional Fourier transform. The group velocity can be experimentally measured using a short-time Fourier transform technique. Attenuation of leaky Lamb waves is mostly due to the re-emission of energy into the surrounding fluid, and it can be measured by these two techniques.

Mathematical Modeling of Non-Destructive Testing for Layered Materials

2015 ◽  
Vol 760 ◽  
pp. 651-656
Author(s):  
Constantin Stefan Petriceanu ◽  
Oana Virlan
Keyword(s):  
Mathematical Modeling ◽  
Lamb Waves ◽  
Layered Materials ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Ultrasound Waves ◽  
Slowness Vector ◽  
Significant Attenuation ◽  
Control Modeling ◽  
Non Destructive

This article deals with mathematical modeling of non-destructive testing of layered materials. Latest research in the nondestructive control modeling with ultrasound waves recommends, for a greater productivity, the use of layer waves Lamb type due to their properties to propagate in solid materials on long distances without any significant attenuation. In the first part it is shown and justified the usage of the choice of Lamb waves to control this type of material. Then follows the theoretical aspects of the modeling and the simulation of the propagation of Lamb waves in layered materials using the mathematical formalism of wave propagation characterization with a vector of type S called slowness vector. Afterwards the mathematical results are presented with the equation of motion within the considered hypothesis, the hypothesis determined in any point of the space of important acoustic parameters in nondestructive testing (in particular the amplitude of the reflected wave quasi-longitudinal wave) based on the known characteristics of the incipient vector (initial impulse). Then follows validation of the developed model based on some simulations using a specialized software. Finally conclusions are presented and prospects for the development of the method.

Investigation of Interaction of Laser Generated Lamb Waves With Structures of Interest

2011 ◽  
Author(s):  
Lei Yang ◽  
I. Charles Ume
Keyword(s):  
Lamb Waves ◽  
Test Procedure ◽  
Ultrasonic Inspection ◽  
Wave Number ◽  
Laser Generation ◽  
Great Promise ◽  
Non Destructive Testing ◽  
Electromagnetic Acoustic Transducer ◽  
Destructive Testing ◽  
Non Destructive

Laser generation/EMAT (electromagnetic acoustic transducer) reception ultrasonic inspection technique shows a great promise in the field of Non-Destructive Testing of welds due to its non-contact nature. However, the broadband nature of laser generation and the dispersive characteristic of Lamb waves make the laser generated ultrasonic signals in thin structures extremely complicated. In order to ease the interpretation of received signals, it is desirable to investigate the interactions of different structural features with Lamb waves and find their related signatures in signal, which offers the potential to detect different types of weld defects using a single test procedure. This work proposed a technique based on 2-D Fourier Transformation to investigate the laser generated Lamb waves experimentally and to find the most sensitive predictors in EMAT received signals corresponding to a specific structural feature of interest. The amplitudes of different Lamb wave modes in the wave-number/frequency domain provide a wealth of information. The demonstration of the technique was carried out on aluminum plates with isolated rectangular notches of different depths. The procedure introduced here is general which can be employed in other applications of Non-Destructive Testing.

scholarly journals Non-destructive testing of nuclear structures behind screen using leaky lamb waves

2019 ◽  
Author(s):  
Pierre Kauffmann ◽  
Marie-Aude Ploix ◽  
Jean-François Chaix ◽  
Cécile Gueudré ◽  
Gilles Corneloup ◽  
...  
Keyword(s):  
Lamb Waves ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Leaky Lamb Waves ◽  
Nuclear Structures ◽  
Non Destructive

scholarly journals Non-destructive testing of plates based on the visualisation of Lamb waves by double-pulsed TV holography

2006 ◽  
Vol 20 (6) ◽  
pp. 1338-1349 ◽  
Author(s):  
Daniel Cernadas ◽  
Cristina Trillo ◽  
Ángel F. Doval ◽  
Óscar López ◽  
Carlos López ◽  
...  
Keyword(s):  
Lamb Waves ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Non Destructive

Numerical simulation of the propagation of Lamb waves and their interaction with defects in C-FRP laminates for non-destructive testing

2019 ◽  
Vol 29 (5) ◽  
pp. 423-441 ◽  
Author(s):  
Morten Voß ◽  
Detlef Ilse ◽  
Wolfgang Hillger ◽  
Till Vallée ◽  
Mathis Eppmann ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Lamb Waves ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Non Destructive

scholarly journals Air-Coupled, Contact, and Immersion Ultrasonic Non-Destructive Testing: Comparison for Bonding Quality Evaluation

2020 ◽  
Vol 10 (19) ◽  
pp. 6757
Author(s):  
Bengisu Yilmaz ◽  
Aadhik Asokkumar ◽  
Elena Jasiūnienė ◽  
Rymantas Jonas Kažys
Keyword(s):  
Quality Evaluation ◽  
Lap Joints ◽  
Guided Wave ◽  
Bulk Wave ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Bonding Quality ◽  
Immersion Testing ◽  
Non Destructive ◽  
Ultrasonic Ndt

The objective of this study is to compare the performance of different ultrasonic non-destructive testing (NDT) techniques for bonding quality evaluation. Aluminium-epoxy-aluminium single lap joints containing debonding in the form of release film inclusions have been investigated using three types of ultrasonic NDT methods: contact testing, immersion testing, and air-coupled testing. Apart from the traditional bulk wave ultrasound, guided wave testing was also performed using air coupled and contact transducers for the excitation of guided waves. Guided wave propagation within adhesive bond was numerically simulated. A wide range of inspection frequencies causing different ultrasonic wavelengths has been investigated. Average errors in defect sizing per ultrasonic wavelength have been used as a feature to determine the performance of each ultrasonic NDT technique. The best performance is observed with bulk wave investigations. Particularly, the higher frequencies (10–50 MHz) in the immersion testing performed significantly better than air-coupled testing (300 kHz); however, air coupled investigations have other advantages as contactless inspection. Whereas guided wave inspections show relatively lower accuracy in defect sizing, they are good enough to detect the presence of the debonding and enable to inspect long range. Even though each technique has its advantages and limitations, guided wave techniques can be practical for the preliminary in-situ inspection of adhesively bonded specimens.

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