Global-Local model for guided wave scattering problems with application to defect characterization in built-up composite structures

Spada, Antonino; Capriotti, Margherita; Scalea, Francesco Lanza di

doi:10.1016/j.ijsolstr.2019.08.015

Cited by 23 publications

(16 citation statements)

References 28 publications

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“…Analytical expressions used to evaluate the Fin+ and F(j)± vectors are provided in Spada et al 32 Starting from equation (1) written for the local region, the achievable equilibrium equations relate forces and displacements through the matrix S=Kℓ−ω2Mℓ…”

Section: The Safe-fe Global–local Methodsmentioning

confidence: 99%

“…is the vector containing the unknown modal amplitudes, and Z and b are the coefficient matrix and the constant term, respectively, both containing complex terms and whose expressions are given in Spada et al 32…”

Section: The Safe-fe Global–local Methodsmentioning

confidence: 99%

“…16–25 Some of the previous global–local studies have taken advantage of the computational efficiency of the Semi-Analytical Finite Element (SAFE) method 26–28 for the “global” portion of the model, and were applied to scattering studies in axisymmetric waveguides, 28,29 flat composite panels, 30,31 and, more recently, built-up skin-to-stringer composite assemblies. 32…”

Section: Introductionmentioning

confidence: 99%

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Global–local model for three-dimensional guided wave scattering with application to rail flaw detection

Spada

Capriotti

Scalea

2021

Structural Health Monitoring

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This study presents a three-dimensional global–local formulation for the prediction of guided wave scattering from discontinuities (e.g. defects). The approach chosen utilizes the Semi-Analytical Finite Element method for the “global” portion of the waveguide, and a full Finite Element discretization for the “local” portion of the waveguide containing the discontinuity. The application of interest is the study of guided wave scattering from transverse head defects in rails. Theoretical scattering results are impossible to obtain in this case for a wide-frequency range. While three-dimensional Semi-Analytical Finite Element–Finite Element models for guided wave scattering studies have been used in the past, this is the only study where guided waves in rails were modeled in a wide-frequency range (up to 180 kHz). A comparison analysis with a benchmark study of wave reflections from the free end of a cylindrical rod is conducted first. For the case of the rail, selected case studies of incoming guided modes were chosen, and reflection and transmission spectra are calculated for head defects of various sizes. This kind of results can be utilized to guide and/or interpret ultrasonic guided wave tests aimed at defect detection or quantification. Finally, parametric studies are conducted to examine more closely the role of certain operational parameters that are important in this kind of analysis, and specifically the size of the “local” region and the number of guided modes considered. These parametric studies lead to compromises that need to be struck on the basis of conservation of energy among all wave modes involved.

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Section: The Safe-fe Global–local Methodsmentioning

confidence: 99%

Section: The Safe-fe Global–local Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Global–local model for three-dimensional guided wave scattering with application to rail flaw detection

Spada

Capriotti

Scalea

2021

Structural Health Monitoring

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“…To investigate the interaction of UGWs with arbitrarily shaped defects, SAFE method mentioned above is not enough and traditional FE modelling is required. A global-local or hybrid SAFE-FE approach has also been proposed recently to deal with this problem [21][22][23]. In this work, 3D FE analysis has been performed with commercial software ABAQUS/Explicit for studying the wave propagation and scattering effect in rail.…”

Section: Fe Modelling With Abaqusmentioning

confidence: 99%

Defects Detection inside the Rail Head by Ultrasonic Guided Waves

Xie

Ding

Zou

et al. 2022

Preprint

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Early detection of defects inside the rail is of great significance to ensure the safety of rail transit. This work investigates the ability of ultrasonic guided waves (UGWs) to detect internal defects of the rail head. First, the model of UGWs propagation in rail, which has an irregular cross-section, is constructed based on semi-analytical finite element (SAFE). Fundamental characteristics such as wavenumber, phase or group velocity, and wave structure inside the rail are then calculated. Following modal and vibration energy distribution analysis, a guided wave mode sensitive to transverse fissure (TF) defects is selected and its excitation method is proposed. The effectiveness of the excitation method is confirmed by simulations performed in the ABAQUS software. According to the simulation data, the dispersion curve calculated by using the two-dimensional Fourier Fast Transform (2D-FFT) coincides well with that of SAFE. After that, the sensitivity of the selected mode to rail internal defect have been validated and its ability to locate defects has also been demonstrated. Finally, the effect of excitation frequency, defect size, defect vertical and horizontal depth on the reflection waveforms is investigated.

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“…The SAHA is based on the boundary integral equation method [ 31 ] and the spectral element method (SEM) [ 32 ]; these two methods meet in the contact area, where the traction vector is unknown. One can see that the SAHA is based on an idea similar to the so-called global–local approach, where a semi-analytical technique is employed to discretize a semi-infinite or elongated area and the FEM discretizes the “local” portion, which contains scatterers of various kinds, including stiffeners [ 33 , 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

Lamb Wave Scattering Analysis for Interface Damage Detection between a Surface-Mounted Block and Elastic Plate

Golub

Shpak

Mueller

et al. 2021

Sensors

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Since stringers are often applied in engineering constructions to improve thin-walled structures’ strength, methods for damage detection at the joints between the stringer and the thin-walled structure are necessary. A 2D mathematical model was employed to simulate Lamb wave excitation and sensing via rectangular piezoelectric-wafer active transducers mounted on the surface of an elastic plate with rectangular surface-bonded obstacles (stiffeners) with interface defects. The results of a 2D simulation using the finite element method and the semi-analytical hybrid approach were validated experimentally using laser Doppler vibrometry for fully bonded and semi-debonded rectangular obstacles. A numerical analysis of fundamental Lamb wave scattering via rectangular stiffeners in different bonding states is presented. Two kinds of interfacial defects between the stiffener and the plate are considered: the partial degradation of the adhesive at the interface and an open crack. Damage indices calculated using the data obtained from a sensor are analyzed numerically. The choice of an input impulse function applied at the piezoelectric actuator is discussed from the perspective of the development of guided-wave-based structural health monitoring techniques for damage detection.

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Global-Local model for guided wave scattering problems with application to defect characterization in built-up composite structures

Cited by 23 publications

References 28 publications

Global–local model for three-dimensional guided wave scattering with application to rail flaw detection

Global–local model for three-dimensional guided wave scattering with application to rail flaw detection

Defects Detection inside the Rail Head by Ultrasonic Guided Waves

Lamb Wave Scattering Analysis for Interface Damage Detection between a Surface-Mounted Block and Elastic Plate

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