Experimental and Computational Studies on the Scattering of an Edge-Guided Wave by a Hidden Crack on a Racecourse Shaped Hole

Vien, Benjamin Steven; Rose, L. R. F.; Chiu, Wing Kong

doi:10.3390/ma10070732

Cited by 13 publications

(22 citation statements)

References 30 publications

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“…The models considered in this study were evaluated by three performance measures: the precision ( ), the recall ( ), and the F1 score ( 1). The precision and recall [77] are calculated by Equations (7) and (8) as below:…”

Section: Evaluate Metricsmentioning

confidence: 99%

Automatic Crack Detection on Road Pavements Using Encoder-Decoder Architecture

Fan

Chen

et al. 2020

Materials

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Automatic crack detection from images is an important task that is adopted to ensure road safety and durability for Portland cement concrete (PCC) and asphalt concrete (AC) pavement. Pavement failure depends on a number of causes including water intrusion, stress from heavy loads, and all the climate effects. Generally, cracks are the first distress that arises on road surfaces and proper monitoring and maintenance to prevent cracks from spreading or forming is important. Conventional algorithms to identify cracks on road pavements are extremely time-consuming and high cost. Many cracks show complicated topological structures, oil stains, poor continuity, and low contrast, which are difficult for defining crack features. Therefore, the automated crack detection algorithm is a key tool to improve the results. Inspired by the development of deep learning in computer vision and object detection, the proposed algorithm considers an encoder-decoder architecture with hierarchical feature learning and dilated convolution, named U-Hierarchical Dilated Network (U-HDN), to perform crack detection in an end-to-end method. Crack characteristics with multiple context information are automatically able to learn and perform end-to-end crack detection. Then, a multi-dilation module embedded in an encoder-decoder architecture is proposed. The crack features of multiple context sizes can be integrated into the multi-dilation module by dilation convolution with different dilatation rates, which can obtain much more cracks information. Finally, the hierarchical feature learning module is designed to obtain a multi-scale features from the high to low- level convolutional layers, which are integrated to predict pixel-wise crack detection. Some experiments on public crack databases using 118 images were performed and the results were compared with those obtained with other methods on the same images. The results show that the proposed U-HDN method achieves high performance because it can extract and fuse different context sizes and different levels of feature maps than other algorithms.

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Section: Evaluate Metricsmentioning

confidence: 99%

Automatic Crack Detection on Road Pavements Using Encoder-Decoder Architecture

Fan

Chen

et al. 2020

Materials

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“…Originally observed in models of rectangular waveguides [9], damage detection using extensional edge waves was demonstrated using laser generated ultrasound in a pitch-catch configuration to detect pitting in steel rail bases in 2012 [10]. Vien et al numerically modelled the interaction of extensional edge waves in isotropic plates with cracks [11] and developed and experimentally demonstrated the scattering of edge waves by cracks on race-course shaped holes in aluminium plates [12]. Small cracks (less than one fifth of the wavelength) were shown to produce appreciable scattering (into both edge waves and plate modes) with amplitudes varying linearly with crack length.…”

Section: Introductionmentioning

confidence: 99%

The Detection of Impact Damage to the Edges of CFRP Plates Using Extensional Ultrasonic Edge Waves

Chu

Courtney

2021

J Nondestruct Eval

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Extensional edge waves propagate along the edges of plates, with low attenuation in the propagation direction and amplitude decreasing rapidly (within one or two wavelengths) in the direction perpendicular to the plate edge. This makes them an ideal candidate for inspecting the edges of plate-like structures. Here, finite-element models and experiments are used to investigate the propagation and scattering of extensional edge waves in composite plates and application to damage detection is demonstrated. Piezoceramic transducers attached to the edge of a 4-mm-thick carbon-fibre-reinforced polymer (CFRP) plate were used to excite 140-kHz edge waves and damage detection demonstrated using two experimental configurations: pitch-catch and two-transducer pulse-echo. Damage due to edge-on impacts of 5 J and 10 J were detected in both configurations. A mass-addition damage model was used to investigate the effect of damage location. Detection was specific to damage within 33 mm (1.5 wavelengths) of the plate edge with propagation unaffected by features beyond that distance. The time of arrival of reflected signals in pulse-echo mode was accurately predicted using the edge-wave group velocity indicating that this configuration can be used for locating damage on edges. The localisation of edge waves means that they can specifically detect damage at the edges of structures, and attenuation measurements indicate that their useful propagation distance is large (5.5 m).

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“…Subsequently, several damage detection methods, which utilise feature-guided wave modes, such as circumferential creeping, weldguided or wedge wave modes, have been suggested and explored, with some of these methods exhibiting encouraging results in a laboratory enviroment. [12][13][14][15][16] The present article is focused on the fundamental mode of edge waves (or ES 0 mode), which is very promising for distant damage identification. Edge waves are a natural analogue of classical surface waves, first studied by Rayleigh.…”

Section: Introductionmentioning

confidence: 99%

“…Subsequently, several damage detection methods, which utilise feature-guided wave modes, such as circumferential creeping, weld-guided or wedge wave modes, have been suggested and explored, with some of these methods exhibiting encouraging results in a laboratory enviroment. 12–16…”

Section: Introductionmentioning

confidence: 99%

“…18,19 Relatively fewer investigations, mostly theoretical, however, have been focused on behaviour of transient edge waves. Despite previous studies which have focused on feature-guided wave modes such as the circumferential creeping wave, 12 edge-guided wave 14–16 and weld-guided waves, 13 it seems that there are no studies which comprehensively explore the possible applications of the fundamental edge wave mode for distant damage detection in slender structures with free edge.…”

Section: Introductionmentioning

confidence: 99%

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Damage detection with the fundamental mode of edge waves

Hughes

Mohabuth

Khanna

et al. 2020

Structural Health Monitoring

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Detection of mechanical damage using Lamb or Rayleigh waves is limited to relatively simple geometries, yet real structures often incorporate features such as free or clamped edges, welds, rivets, ribs and holes. All these features are potential sources of wave reflections and scattering, which make the application of these types of guided waves for damage detection difficult. However, these features can themselves generate so-called ‘feature-guided’ waves. This article details the first application of the fundamental mode of transient edge waves for detection of mechanical damage. The fundamental edge wave mode (ES0) – a natural analogue to Rayleigh waves – is weakly dispersive and may decay with propagation distance. The phase and group velocities of the ES0 wave mode are close to the fundamental shear horizontal (SH0) and symmetric Lamb (S0) wave modes, at low and high frequencies, respectively. It is therefore quite challenging to excite a single ES0 mode and avoid wave coupling. However, it was found experimentally that at medium range frequencies the ES0 mode can be decoupled from SH0 and S0 modes, and its decay is small, allowing for distant detection of defects and damage along free edges of slender structural components. This article provides a brief theory of edge waves, excitation methodology and successful examples of distant detection of crack-like and corrosion damage in I-beam sections, which are widely applied in engineering and construction.

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Experimental and Computational Studies on the Scattering of an Edge-Guided Wave by a Hidden Crack on a Racecourse Shaped Hole

Cited by 13 publications

References 30 publications

Automatic Crack Detection on Road Pavements Using Encoder-Decoder Architecture

Automatic Crack Detection on Road Pavements Using Encoder-Decoder Architecture

The Detection of Impact Damage to the Edges of CFRP Plates Using Extensional Ultrasonic Edge Waves

Damage detection with the fundamental mode of edge waves

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