Nonlinear elastic wave tomography for the imaging of corrosion damage

Ciampa, Francesco; Scarselli, Gianfranco; Pickering, Simon; Meo, Michele

doi:10.1016/j.ultras.2015.05.011

Cited by 29 publications

(17 citation statements)

References 27 publications

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“…Nonlinear elastic wave spectroscopy (NEWS) techniques are an innovative class of ultrasonic NDE and SHM inspection methods that measure nonlinear elastic effects in the kHz frequency range to reveal the presence of surface and sub-surface micro-flaws [7], [8]. Indeed, the interactions of ultrasonic waves with early stage material damage and micro-cracks generates either the frictional heating (rubbing) or the transfer of deformation energy (clapping).…”

Section: Introductionmentioning

confidence: 99%

Nonlinear ultrasonic stimulated thermography for damage assessment in isotropic fatigued structures

Fierro

Callà

Ginzburg

et al. 2017

Journal of Sound and Vibration

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Traditional non-destructive evaluation (NDE) and structural health monitoring (SHM) systems are used to analyse that a structure is free of any harmful damage. However, these techniques still lack sensitivity to detect the presence of material micro-flaws in the form of fatigue damage and often require timeconsuming procedures and expensive equipment. This research work presents a novel "nonlinear ultrasonic stimulated thermography" (NUST) method able to overcome some of the limitations of traditional linear ultrasonic/thermography NDE-SHM systems and to provide a reliable, rapid and cost effective estimation of fatigue damage in isotropic materials. Such a hybrid imaging approach combines the high sensitivity of nonlinear acoustic/ultrasonic techniques to detect micro-damage, with local defect frequency selection and infrared imaging. When exciting structures with an optimised frequency, nonlinear elastic waves are observed and higher frictional work at the fatigue damaged area is generated due to clapping and rubbing of the crack faces. This results in heat at cracked location that can be measured using an infrared camera. A Laser Vibrometer (LV) was used to evaluate the extent that individual frequency components contribute to the heating of the damage region by quantifying the outof-plane velocity associated with the fundamental and second order harmonic responses. It was experimentally demonstrated the relationship between a nonlinear ultrasound parameter (βratio) of the material nonlinear response to the actual temperature rises near the crack. These results demonstrated that heat generation at damaged regions could be amplified by exciting at frequencies that provide nonlinear responses, thus improving the imaging of material damage and the reliability of NUST in a quick and reproducible manner.

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Section: Introductionmentioning

confidence: 99%

Nonlinear ultrasonic stimulated thermography for damage assessment in isotropic fatigued structures

Fierro

Callà

Ginzburg

et al. 2017

Journal of Sound and Vibration

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“…In many structure health monitoring (SHM) applications, ultrasonic guided wave tomography is used as a reliable tool for detecting and monitoring corrosion [5][6][7][8][9][10][11]. Sizing the corrosion region in a plate-like or a pipe-like structure is very important for corrosion detection and monitoring [12][13][14]. Conventional ultrasonic corrosion mapping is carried out by point-by-point scanning on the surface of the materials [15,16] and calculating the thickness from the arrival time of the reflected waves.…”

Section: Introductionmentioning

confidence: 99%

A Sparse Model of Guided Wave Tomography for Corrosion Mapping in Structure Health Monitoring Applications

Zhang

2019

Applied Sciences

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To improve the reconstruction image spatial resolutions of ultrasonic guided wave ray tomography, a sparse model, based on the differences between the inspected and original slowness of the ultrasonic guided waves propagating in the plate-like or pipe-like materials, is first proposed in this paper. Unlike the conventional ultrasonic guided wave tomography whose reconstruction image resolutions are limited by an underdetermined linear model, analyses show that our new model, although it is also underdetermined, can give the optimal solution of the reconstruction image when the constraints on the sparsity of the slowness difference distribution are valid. The reason for the validation of the sparse constraints on the corrosions of the materials is explained. Based on our new model, a least absolute shrinkage and selection operator (LASSO) approach to do the thickness change mapping of a structure health monitoring (SHM) application is then formulated. Analyses also show that the visible artifacts can be avoided using our method, and the spatial resolutions of reconstruction image by our approach can further be improved by increasing the number of grids in the calculation. The approach is validated by experimental work on an aluminum plate. It is also shown that compared to the conventional ray tomography, the presented method can achieve a relatively high spatial resolution, with good suppression of artifacts.

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“…A number of authors have recently focused their studies on the nonlinear behaviour of ultrasonic waves in composites, both numerically and experimentally [9,10]. Typically, both the second and third order nonlinear elastic responses are used for material damage identification and localisation [11]. Ciampa et al [12,13] and Malfense-Fierro and Meo [14] use the second order harmonic response and nonlinear inverse filtering technique in order to detect damage in multi-layered media.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear elastic multi-path reciprocal method for damage localisation in composite materials

et al. 2018

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Nonlinear ultrasonic techniques rely on the measurement of nonlinear elastic effects caused by the interaction of ultrasonic waves with the material damage, and have shown high sensitivity to detect micro-cracks and defects in the early stages. This paper presents a nonlinear ultrasonic technique, here named nonlinear elastic multi-path reciprocal method, for the identification and localisation of micro-damage in composite laminates. In the proposed methodology, a sparse array of surface bonded ultrasonic transducers is used to measure the second harmonic elastic response associated with the material flaw. A reciprocal relationship of nonlinear elastic parameters evaluated from multiple transmitter-receiver pairs is then applied to locate the micro-damage. Experimental results on a damaged composite panel revealed that an accurate damage localisation was obtained using the normalised second order nonlinear parameter with a high signal-to-noise-ratio (∼11.2dB), whilst the use of bicoherence coefficient provided high localisation accuracy with a lower signal-to-noise-ratio (∼1.8dB). The maximum error between the calculated and the real damage location was nearly 13mm. Unlike traditional linear ultrasonic techniques, the proposed nonlinear elastic multi-path reciprocal method allows detecting material damage on composite materials without a priori knowledge of the ultrasonic wave velocity nor a baseline with the undamaged component.

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Nonlinear elastic wave tomography for the imaging of corrosion damage

Cited by 29 publications

References 27 publications

Nonlinear ultrasonic stimulated thermography for damage assessment in isotropic fatigued structures

Nonlinear ultrasonic stimulated thermography for damage assessment in isotropic fatigued structures

A Sparse Model of Guided Wave Tomography for Corrosion Mapping in Structure Health Monitoring Applications

Nonlinear elastic multi-path reciprocal method for damage localisation in composite materials

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