Experimental and numerical studies of guided wave damage detection in bars with structural discontinuities

Rucka, Magdalena

doi:10.1007/s00419-009-0389-8

Cited by 35 publications

(34 citation statements)

References 34 publications

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“…It has been shown that the single mode theory cannot be sufficient to capture the wave propagation phenomenon for thick beams and/or high frequency wave 22,38 , which is the situation of the current study. Hence the Mindlin-Herrmann theory was correction factors introduced to account both for the non-symmetry of the cross-section and the fact that the actual stresses are not distributed as assumed 37 .…”

Section: Mindlin-herrmann Theorymentioning

confidence: 85%

Bayesian model updating approach for experimental identification of damage in beams using guided waves

2014

Structural Health Monitoring

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A Bayesian approach is proposed to quantitatively identify damages in beam-like structures using experimentally measured guided wave signals. The proposed methodology treats the damage location, length and depth as unknown parameters. Damage identification is achieved by solving an optimization problem, in which a hybrid particle swarm optimization (PSO) algorithm is applied to maximize the probability density function (PDF) of a damage scenario conditional on the measured guided wave signals. Signal envelopes extracted by the Hilbert transform are proposed to minimize the complexity of the optimization problem in order to enhance the robustness and computational efficiency of the damage identification. One of the advantages of the proposed methodology is that instead of only pinpointing the multivariate damage characteristics, the uncertainty associated with the damage identification results is also quantified. This outcome provides essential information for making decisions about the remedial work necessary to repair structural damage. The experimental data consists of guided wave signals measured at a single location of the beams. A number of experimental case studies considering damages of different scenarios are used to demonstrate the success of the proposed Bayesian approach in identifying the damages. The results show that the proposed approach is able to accurately identify damages, even when the extent of the damage is small. KeywordsBayesian approach, guided waves, beam, damage identification, probability density function IntroductionInfrastructure plays an important role in our daily life. It enhances access to public services and both physical and service sector resources (e.g., bridges, buildings, aerospace, pipeline, wind energy generation as well as land and water transport infrastructure). The aging and deterioration of engineered infrastructure across the developed world have therefore become a universal challenge for governments and industries. Thus, monitoring structural integrity to enhance the sustainability and reliability of both new and old structures, and the reduction of their life cycle costs have become increasingly important.Accumulation of damage over the lifespan of a structure without adequate and timely inspection can lead to catastrophic failure. Various damage detection techniques have been developed over many years. These are typified by conventional ultrasonic, acoustic emission, eddy-current, vibration-based and guided wave techniques [1][2][3][4][5][6][7] . Vibration-based and guided wave techniques in particular have attracted much attention. Vibration-based techniques detect damages using the dynamic characteristics of structures have been extensively studied in the last two decades 8-12 but detection of damage mainly depends on successfully recognising changes in the vibration characteristics of the structures being tested. Guided wave techniques, on the other hand, use mechanical stress waves propagated at ultrasonic frequencies along natural boundaries in t...

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Section: Mindlin-herrmann Theorymentioning

confidence: 85%

Bayesian model updating approach for experimental identification of damage in beams using guided waves

2014

Structural Health Monitoring

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“…It has been demonstrated that wave propagation methods can be efficiently applied in monitoring of the strain changes in reinforced concrete during the process of damage development [10][11][12][13]. Wave propagation signals collected during an experiment conducted on concrete structures are characterized by a greater degree of complexity than for steel thin rods [14] or plates [15] because of the solid geometry of typical concrete element. Damage detection methodologies utilizing wave propagation signals directed to concrete structures require a lot of testing data for different stages of damage.…”

Section: Introductionmentioning

confidence: 99%

“…Spectral elements have been also developed for structural type finite elements like rods, beams or plates (e.g. [14,15,[20][21][22][23][24][25][26][27]), with the attention paid to theoretical aspects of wave propagation phenomena. In paper [28], 3-dimensional spectral elements have been presented, with application to damage detection in metal plate structures.…”

mentioning

confidence: 99%

A novel formulation of 3D spectral element for wave propagation in reinforced concrete

Rucka

Witkowski²,

Chróścielewski³

et al. 2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. The paper deals with numerical simulations of wave propagation in reinforced concrete for damage detection purposes. A novel formulation of a 3D spectral element was proposed. The reinforcement modelled as the truss spectral element was embedded in the 3D solid spectral finite element. Numerical simulations have been conducted on cuboid concrete specimens reinforced with two steel bars. Different degradation models were considered to study the real behaviour of bended beams. In wave propagation modelling the spectral element method (SEM) plays an important role [16]. The SEM method is based on the high-order finite elements, usually of class C 0 . As a special feature, the elements have their nodes distributed both in physical space and in parent elements according to the Gauss-Lobatto-Legendre quadrature rule. As a consequence, it is possible to obtain a diagonal mass matrix at the element level which in turn, when appropriately taken into account, leads to fast and efficient time marching scheme. A multitude of aspects pertaining to SEM, especially for modelling of seismic waves (e.g. [17,18]) as well as for wave propagation for SHM purposes (e.g. [19]), have been already discussed. Spectral elements have been also developed for structural type finite elements like rods, beams or plates (e.g. [14,15,[20][21][22][23][24][25][26][27]), with the attention paid to theoretical aspects of wave propagation phenomena. In paper [28], 3-dimensional spectral elements have been presented, with application to damage detection in metal plate structures. Unbounded structures need a special treatment to preserve the dissipation of the energy in the infinite. The use of absorbing layers has been proposed in [29], on the example of a 1-dimensional rod and a 3-dimensional half-cylindrical shell. As far as damage detection is concerned, various techniques applied to simulation of damage effects have been considered. One can refer for instance to [20][21][22] where discontinuities in the form of cracks/caverns or point masses have been accounted for. A semi-analytical approach in analysis of flexural wave propagation through a slender beam, with a breathing edge-crack, is developed in [30]. In the context of non-homogenous material reference [31] discusses the use of the SEM with functionally graded material (FGM). To the authors' best knowledge, the problem of wave propagation in damaged reinforced concrete with the use of SEM has been not investigated.The present study focuses on development of a novel 3D spectral element for wave propagation in reinforced concrete subjected to mechanical degradation. Numerical simulations have been conducted on cuboid concrete specimens reinforced with two steel bars. Different degradation models were considered to reflect the real behaviour of bended beams described in [11].

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“…For example, in the case of beam elements modelled with FDSFEM, among the interesting scientific reports, one can find e.g., [133], where the comparison of different beam theories is given in terms of the correlation of the accuracy of the results obtained and the theory applied for different wave propagation parameters. Numerical and experimental analysis of wave propagation in beam and rod structures has also been examined in [132]. This research has been extended to include L-joint structure [134].…”

Section: Wave Propagation In 1d Elementsmentioning

confidence: 99%

“…This approach in connection with well-known rod theories from the area of strength of materials has been analysed by a research group from Gdańsk, Poland [130][131][132]. The first two papers cover the problem of comparison of different rod theories and the influence of the proper choice of theory on the obtained results reliability, the third paper comprises the experimental verification of proposed numerical models for modelling of longitudinal waves in structural rod elements.…”

Section: Wave Propagation In 1d Elementsmentioning

confidence: 99%

Spectral Methods for Modelling of Wave Propagation in Structures in Terms of Damage Detection—A Review

Palacz

2018

Applied Sciences

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Modern methods of detection and identification of structural damage direct the activities of scientific groups towards the improvement of diagnostic methods using for example the phenomenon of mechanical wave propagation. Damage detection methods that use mechanical wave propagation in structural components are extremely effective. Many different numerical approaches are used to model this phenomenon, but, due to their universal nature, spectral methods are the most commonly used, of which there are several types. This paper reviews recent research efforts in the field to show basic differences and effectiveness of the two most common spectral methods used for modelling the wave propagation problem in terms of damage detection.

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Experimental and numerical studies of guided wave damage detection in bars with structural discontinuities

Cited by 35 publications

References 34 publications

Bayesian model updating approach for experimental identification of damage in beams using guided waves

Bayesian model updating approach for experimental identification of damage in beams using guided waves

A novel formulation of 3D spectral element for wave propagation in reinforced concrete

Spectral Methods for Modelling of Wave Propagation in Structures in Terms of Damage Detection—A Review

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