Characterization of Laser Generated Lamb Wave Modes after Interaction with a Thickness Reduction Discontinuity Using Ray Tracing Theory

Balvantín, Antonio J.; Baltazar, Arturo; Rodriguez, P.

doi:10.1007/s11340-013-9846-y

Cited by 6 publications

(3 citation statements)

References 21 publications

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“…Zhang et al [54] proposed a novel version of the linear travel time interpolation method, which was also used to predict and visualise geometric defects in plates. Balvantín et al [55] also developed a ray tracing method based on Fermat's principle by discretising the plate into a grid of constant material properties and applying Snell's law. A thickness reduction defect was experimentally and numerically studied, which showed the ability to reconstruct the tomography of a plate based upon the wave's time of flight.…”

Section: Edge Reflectionsmentioning

confidence: 99%

Numerical modelling of Lamb wave propagation in 2D plate structures

Pollock,

Wild

2023

Aeronaut. j.

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Lamb waves are a growing method for the Non-Destructive Testing and Evaluation (NDT&E) and structural health monitoring (SHM) of aerospace vehicles. These guided waves can propagate over large distances and have a strong tendency to interact with damage. Whilst several methods exist for the modelling of Lamb wave propagation, this paper is the first to introduce a first principles numerical model that can efficiently and accurately predict the behaviour of Lamb waves. The numerical model is easier to understand and implement compared with analytical solutions and significantly faster than discretised numerical methods. The numerical model is presented in detail for an isotropic and homogenous plate, along with validation against the industry accepted, WaveForm Revealer 3 (WFR3) software. The results show a mean correlation across all assessed parameters of 90.4% and 96.6% for the symmetric and antisymmetric modes, respectively. Further discussion is provided on future developments to the model, including on the topic of high temperature effects, anisotropic materials and edge reflections.

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Section: Edge Reflectionsmentioning

confidence: 99%

Numerical modelling of Lamb wave propagation in 2D plate structures

Pollock,

Wild

2023

Aeronaut. j.

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“…These methods can evaluate the structural state by comparing the parameters of intact structures and these of damaged structures, but it is difficult to quantitatively identify the damage. A damage identification method based on time of flight (TOF) was proposed (Park et al, 2006; Balvantín et al, 2014; Feng et al, 2019). Kehlenbach and Hanselka (2003) proposed a structural damage identification method based on ellipse algorithm to determine the location of damage in a structure.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental research on damage shape recognition of aluminum alloy plate based on Lamb wave

Shen

2021

Journal of Intelligent Material Systems and Structures

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The structure health monitoring (SHM) system with Lamb waves technique is studied numerically and experimentally in this paper. A damage shape recognition algorithm (DSRA) is developed for the hole on aluminum alloy plate specimen. The proposed DSRA is established based on the two arrival time difference method (2/ATDM) and Lagrangian optimization method. This method captures the damage shape by describing the coordinates of the reflection point from the piezoelectric ceramic lead zirconate titanate (PZT) transducers to the damage edge. 2/ATDM provides a way to obtain coordinate points by the arrival time which is determined by Lamb waves. And the coordinate points are optimized by the Lagrangian optimization method. A numerical model is established to simulate the proposed experiment process. Its convergence rate of mesh size and time steps is investigated, and the numerical results are verified by these of experiment. Hence, the shape recognition of damage occurring at an arbitrary position and that of irregular damage are studied by the proposed numerical and experiment methods.

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“…curved surface shape), narrowband (Wu and Ume, 2011) or wideband frequencies with excitation component, and ideal point excitation. Therefore, an air-coupled transducer and laser ultrasonic generation of Lamb waves using a non-contact device have been investigated (Clorennec et al., 2006; Castaings and Hosten, 2008; Sale et al., 2011; Cès et al., 2012; Balvantín et al., 2014; Harb and Yuan, 2015).…”

Section: Introductionmentioning

confidence: 99%

Lamb wave generation using nanosecond laser ablation to detect damage

Hosoya

Umino

Kanda

et al. 2017

Journal of Vibration and Control

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This paper proposes a non-contact damage detection method based on Lamb waves generated by laser ablation (LA). Previously, Lamb waves generated by contact-type sensors such as acoustic emission or piezoelectric zirconate titanate devices have been studied to detect damage. Lamb wave generation systems with embedded contact-type excitation devices to objective structures to be inspected may quickly realize large-area damage detection on a huge object such as an aircraft. However, replacing contact-type devices with non-contact devices in Lamb wave generation systems, the systems will have sufficient potential to excite under the specific conditions such as submerged target structures in liquid and high-temperature substances. The LA-generated Lamb waves that have amplitudes several hundred times larger than those generated by conventional laser-thermoelastically generated Lamb waves are of advantage from the viewpoint of the signal-to-noise ratio in the measurements. When the laser fluence reaches 10 12-10 14 W/m 2 , which is greater than that for laser-thermoelastic regime, a LA regime is induced. The amplitudes of the LA-generated Lamb waves might be higher than those of the laser-thermoelastically generated Lamb waves; this is within the scope of the assumption. Since the LA process entails a number of nonlinear processes such as melting, vaporization, and sublimation, it is important to confirm that LA could generate a Lamb wave and its mode. In this paper, Lamb waves that contain broadband frequency elements of more than several hundred kHz are generated by non-contact impulse excitation using LA, which is common in vibration tests in the high-frequency range, laser peening, propulsion of micro-aircraft, bolt loosening diagnosis, etc. The present method is evaluated by comparing the measured and calculated propagation phase and group velocities of the Lamb waves. Furthermore, the feasibility of our approach is demonstrated by non-contact damage detection against an aluminum alloy 2024 plate with a crack.

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Characterization of Laser Generated Lamb Wave Modes after Interaction with a Thickness Reduction Discontinuity Using Ray Tracing Theory

Cited by 6 publications

References 21 publications

Numerical modelling of Lamb wave propagation in 2D plate structures

Numerical modelling of Lamb wave propagation in 2D plate structures

Numerical and experimental research on damage shape recognition of aluminum alloy plate based on Lamb wave

Lamb wave generation using nanosecond laser ablation to detect damage

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