ORCID Profile
0000-0003-4638-2756
Current Organisation
University of Adelaide
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Mechanical Engineering | Solid Mechanics | Infrastructure Engineering and Asset Management | Structural Engineering | Dynamics, Vibration and Vibration Control | Numerical Modelling and Mechanical Characterisation | Composite and Hybrid Materials | Interdisciplinary Engineering not elsewhere classified | Civil Engineering | Aerospace Materials | Theoretical and Applied Mechanics | Interdisciplinary Engineering | Acoustics and Noise Control (excl. Architectural Acoustics) | Marine Engineering |
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in Engineering | Expanding Knowledge in Technology | Air Safety | Metals (e.g. Composites, Coatings, Bonding) | Management of Noise and Vibration from Transport Activities | Air Force | Navy | Energy Transmission and Distribution (excl. Hydrogen) | Energy Storage (excl. Hydrogen) | Scientific Instruments | Rail Safety
Related Links
Publications
Single-Plant Biocomposite from Ricinus Communis: Preparation, Properties and Environmental Performance
Publisher: Springer Science and Business Media LLC
Date: 27-07-2013
Guided wave-based characterisation of cracks in pipes utilising approximate Bayesian computation
Publisher: Elsevier BV
Date: 11-2023
Effect of central and non-central frequency components on the quality of damage imaging
Publisher: Springer Science and Business Media LLC
Date: 15-11-2018
Bayesian model updating approach for experimental identification of damage in beams using guided waves
Publisher: SAGE Publications
Date: 07-05-2014
Abstract: 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 algorithm is applied to maximize the probability density function 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 consist 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.
Probabilistic Damage Characterisation in Beams using Guided Waves
Publisher: Elsevier BV
Date: 2011
Influence of pristine graphene particle sizes on physicochemical, microstructural and mechanical properties of Portland cement mortars
Publisher: Elsevier BV
Date: 12-2020
The selection of pattern features for structural damage detection using an extended Bayesian ANN algorithm
Publisher: Elsevier BV
Date: 10-2008
Investigation of nonlinear torsional guided wave mixing in pipes buried in soil
Publisher: Elsevier BV
Date: 12-2022
The performance optimization of combinational harmonic generation for quasi-synchronous Lamb wave mixing
Publisher: SPIE
Date: 18-04-2022
DOI: 10.1117/12.2612126
The biomechanical mechanism of upper airway collapse in osahs patients using clinical monitoring data during natural sleep
Publisher: MDPI AG
Date: 10-11-2021
DOI: 10.3390/S21227457
Abstract: Obstructive sleep apnea hypopnea syndrome (OSAHS) is a common sleep disorder characterized by repeated pharyngeal collapse with partial or complete obstruction of the upper airway. This study investigates the biomechanics of upper airway collapse of OSASH patients during natural sleep. Computerized tomography (CT) scans and data obtained from a device installed on OSASH patients, which is comprised of micro pressure sensors and temperature sensors, are used to develop a pseudo three-dimensional (3D) finite element (FE) model of the upper airway. With consideration of the gravity effect on the soft palate while patients are in a supine position, a fluid–solid coupling analysis is performed using the FE model for the two respiratory modes, eupnea and apnea. The results of this study show that the FE simulations can provide a satisfactory representation of a patient’s actual respiratory physiological processes during natural sleep. The one-way valve effect of the soft palate is one of the important mechanical factors causing upper airway collapse. The monitoring data and FE simulation results obtained in this study provide a comprehensive understanding of the occurrence of OSAHS and a theoretical basis for the in idualized treatment of patients. The study demonstrates that biomechanical simulation is a powerful supplementation to clinical monitoring and evaluation.
Finite element prediction of acoustoelastic effect associated with Lamb wave propagation in pre-stressed plates
Publisher: IOP Publishing
Date: 30-07-2019
Reconstruction of baseline time-trace under changing environmental and operational conditions
Publisher: IOP Publishing
Date: 22-02-2016
Defects evaluation near edges of structural elements using the fundamental mode of edge waves
Publisher: Elsevier BV
Date: 08-2023
Second-order harmonic generation of Lamb wave in prestressed plates
Publisher: Elsevier BV
Date: 11-2019
Scattering characteristics of quasi-Scholte waves at blind holes in metallic plates with one side exposed to water
Publisher: Elsevier BV
Date: 2021
Reliability Analysis of Single-Degree-of-Freedom Elastoplastic Systems. II: Suboptimal Excitations
Publisher: American Society of Civil Engineers (ASCE)
Date: 10-2007
Study on the Sensitive Factors of Structural Nonlinear Damage Based on the Innovation Series
Publisher: World Scientific Pub Co Pte Lt
Date: 09-2020
DOI: 10.1142/S0219455420420110
Abstract: Constructing a damage-sensitive factor (DSF) is one of the key steps in structural damage detection. In this paper, innovation series extracted from the auto-regressive conditional heteroscedasticity (ARCH) model are proposed to construct a DSF, which is defined as the standard deviation of innovation (SDI). A three-story shear building structure is used to demonstrate and verify the performance of the proposed method, and the results are compared with the standard deviation of the residuals (SDR) based on an auto-regressive (AR) model. In the proposed method, the AR model is established using the acceleration responses obtained from the reference and test states. The residual series are then extracted for fitting the SDR. Subsequently, the ARCH model is constructed based on the residual series from the AR model, and a new DSF of SDI is defined. This study focuses on analyzing the accuracy of fitting AR model and ARCH model to vibration response data via the normal probability distribution, and identifying the characteristics of the residual and innovation series. The mean squared error (MSE) is used as the loss function to calculate the loss on residual and innovation series from the AR model and ARCH model, respectively. The results demonstrate that the SDR can be used for nonlinear damage detection. However, the proposed SDI can provide more accurate nonlinear damage identification and is robust to varying environmental condition and small damages. Thus, the innovation series developed based on ARCH model are promising for expressing and constructing nonlinear DSFs.
Debonding detection in rebar-reinforced concrete structures using second harmonic generation of longitudinal guided wave
Publisher: Elsevier BV
Date: 09-2021
Numerical analysis of shear transfer across an initially uncrack reinforced concrete member
Publisher: Elsevier BV
Date: 11-2015
Generation of higher harmonics with the fundamental edge wave mode
Publisher: AIP Publishing
Date: 09-03-2020
DOI: 10.1063/1.5142416
Abstract: The measurement and evaluation of nonlinear elastic properties represents a great interest in materials science and engineering. These measurements can be conducted using the internal resonance of higher harmonics generated with ultrasonic bulk, Rayleigh, and Lamb waves. However, these waves are spatially dispersive, making the evaluation very difficult. In this paper, we present the outcomes of an experimental study on the generation of higher harmonics with the fundamental mode of edge waves. This wave mode—an analog of the Rayleigh wave—propagates along the apex of an elastic plate, where the lateral plate surfaces naturally avoid spatial dispersion. In addition, this mode is weakly dispersive in the frequency domain enabling approximate internal resonance, which is required for the measurement of material nonlinearities. The current experimental results indicate that the second harmonic of the fundamental edge wave mode grows linearly with the propagation distance. The linear rate of accumulation of this harmonic can then be related to the nonlinear elastic properties as procured by previous theoretical studies.
Damage detection in the T-welded joint using Rayleigh-like feature guided wave
Publisher: Elsevier BV
Date: 04-2023
Higher harmonic generation of Rayleigh wave at debondings in FRP-retrofitted concrete structures
Publisher: IOP Publishing
Date: 18-09-2018
Rayleigh wave propagation and scattering characteristics at debondings in fibre-reinforced polymer-retrofitted concrete structures
Publisher: SAGE Publications
Date: 30-01-2019
Abstract: Structural health monitoring is of paramount importance to ensure safety and serviceability of structures. Among different damage detection techniques, guided wave–based approach has been the subject of intensive research activities. This article investigates the capability of Rayleigh wave for debonding detection in fibre-reinforced polymer-retrofitted concrete structures through studying wave scattering phenomenon at debonding between fibre-reinforced polymer and concrete. A three-dimensional finite element model is presented to simulate Rayleigh wave propagation and scattering at the debonding. Numerical simulations of Rayleigh wave propagation are validated with analytical solutions. Absorbing layers by increasing d ing is employed in the fibre-reinforced polymer-retrofitted concrete numerical model to maximise computational efficiency in the scattering study. Experimental measurements are also carried out using a three-dimensional laser Doppler vibrometer to validate the three-dimensional finite element model. Very good agreement is observed between the numerical and experimental results. The experimentally and analytically validated finite element model is then used in numerical case studies to investigate the wave scattering characteristic at the debonding. The study investigates the directivity patterns of scattered Rayleigh waves, in both backward and forward directions, with respect to different debonding size-to-wavelength ratios. This study also investigates the suitability of using bonded mass to simulate debonding in the fibre-reinforced polymer-retrofitted concrete structures. By enhancing physical understanding of Rayleigh wave scattering at the debonding between fibre-reinforced polymer/concrete interfaces, this study can lead to further advance of Rayleigh wave–based damage detection techniques.
On Accuracy of Analytical Modeling of Lamb Wave Scattering at Delaminations in Multilayered Isotropic Plates
Publisher: World Scientific Pub Co Pte Lt
Date: 29-10-2015
DOI: 10.1142/S0219455415400106
Abstract: The study investigates the accuracy of analytical solutions to the fundamental anti-symmetric Lamb wave scattering at delamination in multilayered isotropic plates. The analytical models are based on the wave function expansion method and Born approximation within the framework of Mindlin plate theory. The study validates the accuracy of modeling the delamination as an inhomogeneity with reduced bending rigidity in predicting Lamb wave scattering induced by geometry change at the delaminated region. A good agreement is observed between the analytical solutions and results of experimentally verified 3D explicit finite element (FE) simulations. The findings support the inhomogeneity assumption in Lamb wave scattering problems and show the feasibility of employing it in delamination characterization.
Bolted joint torque monitoring using ultrasonic Lamb wave mixing
Publisher: IEEE
Date: 11-09-2021
Niching particle swarm optimization techniques for multimodal buckling maximization of composite laminates
Publisher: Elsevier BV
Date: 08-2017
Retraction notice to “System identification of an enclosure with leakages using a probabilistic approach” [J. Sound Vib. 322 (2009) 756–771](S0022460X08009280)(10.1016/j.jsv.2008.11.013)
Publisher: Elsevier BV
Date: 02-2019
Application of Bayesian-designed artificial neural networks in Phase II structural health monitoring benchmark studies
Publisher: Informa UK Limited
Date: 2014
Second Harmonic Generation of Guided Wave at Crack-Induced Debonding in FRP-Strengthened Metallic Plates
Publisher: World Scientific Pub Co Pte Lt
Date: 20-12-2019
DOI: 10.1142/S0219455419400066
Abstract: The use of fiber-reinforced polymer (FRP) has been widely recognized to be an effective and economical way to strengthen existing structures or repair damaged structures for extending their service life. This study investigates the feasibility of using nonlinear guided wave to monitor crack-induced debonding in FRP-strengthened metallic plates. The study focusses on investigating the nonlinear guided wave interaction with the crack-induced debonding. A three-dimensional (3D) finite element (FE) model is developed to simulate the crack-induced debonding in the FRP-strengthened metallic plates. The performance of using fundamental symmetric ([Formula: see text] and anti-symmetric ([Formula: see text] modes of guided wave as incident wave in the second harmonic generation at the crack-induced debonding is investigated in detail. It is found that the litude of the second harmonic and its variation with different damage sizes are very different when using [Formula: see text] and [Formula: see text] guided wave as the incident wave, respectively. The results suggest that it is possible to detect potential damage and distinguish its type based on the features of the generated second harmonic.
Understanding the interaction of the fundamental Lamb-wave modes with material discontinuity: finite element analysis and experimental validation
Publisher: SAGE Publications
Date: 07-05-2021
DOI: 10.1177/14759217211007118
Abstract: The interaction of guided waves with a material discontinuity is not well understood. This study investigates the propagation behavior of the fundamental Lamb-wave modes, the symmetric mode ( S 0 ) and the anti-symmetric mode ( A 0 ), upon interaction with welded joints of dissimilar materials. A plate with an intact AA6061-T6/AZ31B dissimilar joint was employed, and the interaction of the propagating wave with the material interface was scrutinized numerically and validated experimentally. Plane-wave approximation was also adopted to investigate the behavior of the symmetric modes, and its performance was compared to the numerical and experimental results. The effect of the angle of incidence on the reflection, transmission, and mode conversion of the incident modes was analyzed. The study was conducted as the excited Lamb wave propagated from AA6061-T6 to AZ31B (forward), and when the propagation direction was reversed (backward). Different techniques were developed to identify the in-plane and out-of-plane modes from the three-dimensional measurements and to separate wave reflections and transmissions of the joint. The fundamental shear-horizontal guided-wave mode ( SH 0 mode) has evolved upon the interaction of the obliquely-incident Lamb-wave S 0 mode with the interface. While the reflection of the SH 0 mode from the joint was found to be well-pronounced, its transmission to the other material is extremely weak. The analytical solution, using plane-wave approximation, was accurate for predicting the behavior of the in-plane modes ( S 0 and S 0 – SH 0 modes). Despite the peaks appearing at the critical angle, the absolute values of the reflection coefficients of the studied modes have shown similar trends between the forward and the backward propagation directions. The total reflection of the excited wave, from the material interface, was not observed in any condition. The transmission coefficients of the S 0 and A 0 modes are almost constant until reaching very steep incidence angles [Formula: see text]. The results were experimentally validated on an intact AA6061-T6/AZ31B friction-stir-welded joint using an excitation frequency of 200 kHz. Measurements along the transmission and reflection directions were conducted using a three-dimensional scanning laser vibrometer. Experimental results showed very good agreement with both the analytical and the numerical ones.
Railway ballast damage detection by Markov chain Monte Carlo-based Bayesian method
Publisher: SAGE Publications
Date: 10-07-2017
Abstract: This article reports the development of a Bayesian method for assessing the damage status of railway ballast under a concrete sleeper based on vibration data of the in situ sleeper. One of the important contributions of the proposed method is to describe the variation of stiffness distribution of ballast using Lagrange polynomial, for which the order of the polynomial is decided by the Bayesian approach. The probability of various orders of polynomial conditional on a given set of measured vibration data is calculated. The order of polynomial with the highest probability is selected as the most plausible order and used for updating the ballast stiffness distribution. Due to the uncertain nature of railway ballast, the corresponding model updating problem is usually unidentifiable. To ensure the applicability of the proposed method even in unidentifiable cases, a computational efficient Markov chain Monte Carlo–based Bayesian method was employed in the proposed method for generating a set of s les in the important region of parameter space to approximate the posterior (updated) probability density function of ballast stiffness. The proposed ballast damage detection method was verified with roving hammer test data from a segment of full-scale ballasted track. The experimental verification results positively show the potential of the proposed method in ballast damage detection.
Numerical and experimental investigations on mode conversion of guided waves in partially immersed plates
Publisher: Elsevier BV
Date: 02-2022
Scattering of the fundamental anti-symmetric Lamb wave at delaminations in composite laminates
Publisher: Acoustical Society of America (ASA)
Date: 03-2011
DOI: 10.1121/1.3533741
Abstract: An analysis of the scattering characteristics of the fundamental anti-symmetric (A0) Lamb wave at a delamination in a quasi-isotropic composite laminate is presented. Analytical solutions for this problem do not exist due to the anisotropic nature and multilayer characteristics of composite laminates. This study uses a three-dimensional finite element (FE) method and experimental measurements to provide physical insight into the scattering phenomena. Good agreement is found between simulations and experimental measurements. The results show that the A0 Lamb wave scattering at a delamination in composite laminates is much more complicated than the scattering at a defect in isotropic plates. Scatter litudes and scatter directivity distributions depend on the delamination size to wavelength ratio and the through-thickness location of the delamination damage. The study also investigates the feasibility of the common experimental practice of simulating delamination damage by bonding masses to the surface of composite laminates for guided wave damage detection and characterization methodologies verifications. The results suggest that care is required to use bonded masses to simulate delamination damage for verifying and optimizing damage characterization techniques. In summary, the results of the investigation help to further advance the use of the A0 Lamb wave for damage detection and characterization.
Influence of stacking sequence on scattering characteristics of the fundamental anti-symmetric Lamb wave at through holes in composite laminates
Publisher: Acoustical Society of America (ASA)
Date: 03-2011
DOI: 10.1121/1.3533742
Abstract: This paper investigates the scattering characteristics of the fundamental anti-symmetric (A0) Lamb wave at through holes in composite laminates. Three-dimensional (3D) finite element (FE) simulations and experimental measurements are used to study the physical phenomenon. Unidirectional, bidirectional, and quasi-isotropic composite laminates are considered in the study. The influence of different hole diameter to wavelength aspect ratios and different stacking sequences on wave scattering characteristics are investigated. The results show that litudes and directivity distribution of the scattered Lamb wave depend on these parameters. In the case of quasi-isotropic composite laminates, the scattering directivity patterns are dominated by the fiber orientation of the outer layers and are quite different for composite laminates with the same number of laminae but different stacking sequence. The study provides improved physical insight into the scattering phenomena at through holes in composite laminates, which is essential to develop, validate, and optimize guided wave damage detection and characterization techniques.
Mode Conversion and Scattering of Lamb Waves at Delaminations in Composite Laminates
Publisher: American Society of Civil Engineers (ASCE)
Date: 09-2019
Implication of changing loading conditions on structural health monitoring utilising guided waves
Publisher: IOP Publishing
Date: 05-01-2018
Analysis of scattering and mode conversion of torsional guided waves by cracks in pipes using time-domain spectral element method
Publisher: Springer Singapore
Date: 23-12-2021
Ultrasonic Guided Wave Field Modeling in a One-Side Water-Immersed Steel Plate
Publisher: Springer Singapore
Date: 23-12-2020
Mode shape scaling and implications in modal identification with known input
Publisher: Elsevier BV
Date: 02-2018
Measurement of Elastic Nonlinearities Using the Fundamental Edge Wave Mode
Publisher: Springer International Publishing
Date: 2020
On the selection of advanced signal processing techniques for guided wave damage identification using a statistical approach
Publisher: Elsevier BV
Date: 05-2014
APPLICATION OF BAYESIAN APPROACH FOR DAMAGE CHARACTERIZATION IN BEAMS UTILIZING GUIDED WAVES
Publisher: AIP
Date: 2011
DOI: 10.1063/1.3591918
Time-domain spectral finite element method for analysis of torsional guided waves scattering and mode conversion by cracks in pipes
Publisher: Elsevier BV
Date: 08-2019
Development of Micro-mechanical Models of Fatigue Damage
Publisher: Springer International Publishing
Date: 2020
Higher harmonic generation of guided waves at delaminations in laminated composite beams
Publisher: SAGE Publications
Date: 23-10-2016
Abstract: Detection and characterization of delamination damage are of great importance to the assurance of structural safety. This work investigates the potential of a baseline-free structural health monitoring technique based on higher harmonics resulting from the nonlinear interaction of guided wave and a delamination. The nonlinearity considered in this study arises from the clapping of the sub-laminates in the delaminated region, which generates contact acoustic nonlinearity. Both explicit finite element simulations and experimental tests are conducted on composite laminates containing a delamination of different sizes and at different through-thickness locations. The results show that the interaction between the fundamental asymmetric mode ( A 0 ) of guided wave and a delamination generates contact acoustic nonlinearity in the form of higher harmonics, which provides a good measure for identifying the existence of delaminations and determining their sizes in laminated composite beams. This new insight into the generation mechanisms of nonlinear higher order harmonics in composite laminates will enhance the detection and monitoring of damage in composite structures.
Second harmonic generation at fatigue cracks by low-frequency Lamb waves: Experimental and numerical studies
Publisher: Elsevier BV
Date: 2018
Time-Domain Spectral Finite Element Method for Modeling Second Harmonic Generation of Guided Waves Induced by Material, Geometric and Contact Nonlinearities in Beams
Publisher: World Scientific Pub Co Pte Ltd
Date: 31-08-2020
DOI: 10.1142/S0219455420420055
Abstract: This study proposes a time-domain spectral finite element (SFE) method for simulating the second harmonic generation (SHG) of nonlinear guided wave due to material, geometric and contact nonlinearities in beams. The time-domain SFE method is developed based on the Mindlin–Hermann rod and Timoshenko beam theory. The material and geometric nonlinearities are modeled by adapting the constitutive relation between stress and strain using a second-order approximation. The contact nonlinearity induced by breathing crack is simulated by bilinear crack mechanism. The material and geometric nonlinearities of the SFE model are validated analytically and the contact nonlinearity is verified numerically using three-dimensional (3D) finite element (FE) simulation. There is good agreement between the analytical, numerical and SFE results, demonstrating the accuracy of the proposed method. Numerical case studies are conducted to investigate the influence of number of cycles and litude of the excitation signal on the SHG and its performance in damage detection. The results show that the litude of the SHG increases with the numbers of cycles and litude of the excitation signal. The litudes of the SHG due to material and geometric nonlinearities are also compared with the contact nonlinearity when a breathing crack exists in the beam. It shows that the material and geometric nonlinearities have much less contribution to the SHG than the contact nonlinearity. In addition, the SHG can accurately determine the crack location without using the reference data. Overall, the findings of this study help further advance the use of SHG for damage detection.
An efficient finite element model for buckling analysis of grid stiffened laminated composite plates
Publisher: Elsevier BV
Date: 04-2015
Low-frequency Lamb wave mixing for fatigue damage evaluation using phase-reversal approach
Publisher: Elsevier BV
Date: 08-2022
DOI: 10.1016/J.ULTRAS.2022.106768
Abstract: Fatigue damage is difficult to detect and evaluate non-destructively, specifically at its early stages (before the macro-crack formation). In this study, fatigue damage is evaluated based on the growth rate of the combinational harmonics generated by mixing of two fundamental symmetric mode (S
Debonding detection at adhesive joints using nonlinear Lamb waves mixing
Publisher: Elsevier BV
Date: 2022
Wave mixing with the fundamental mode of edge waves for evaluation of material nonlinearities
Publisher: Elsevier BV
Date: 06-2022
A Lamb-wave-based technique for damage detection in composite laminates
Publisher: IOP Publishing
Date: 15-06-2009
Investigating the reinforcing mechanism and optimized dosage of pristine graphene for enhancing mechanical strengths of cementitious composites
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0RA07639B
Abstract: The proposed reinforcing mechanism and optimized dosage of pristine graphene (PRG) for enhancing mechanical, physicochemical and microstructural properties of cementitious mortar composites are presented.
Modelling and analysis of nonlinear guided waves interaction at a breathing crack using time-domain spectral finite element method
Publisher: IOP Publishing
Date: 20-06-2017
Effect of randomly distributed voids on effective linear and nonlinear elastic properties of isotropic materials
Publisher: Elsevier BV
Date: 05-2021
Scattering characteristics of Lamb waves from debondings at structural features in composite laminates
Publisher: Acoustical Society of America (ASA)
Date: 07-2012
DOI: 10.1121/1.4728192
Abstract: This article investigates the scattering characteristics of Lamb waves from a debonding at a structural feature in a composite laminate. This study specifically focuses on the use of the low frequency fundamental antisymmetric (A0) Lamb wave as the incident wave for debonding detection. Three-dimensional finite element (FE) simulations and experimental measurements are used to investigate the scattering phenomena. Good agreement is obtained between the FE simulations and experimental results. Detailed parameter studies are carried out to further investigate the relationship between the scattering litudes and debonding sizes. The results show that the litude of the scattered A0 Lamb wave is sensitive to the debonding size, which indicates the potential of using the low frequency A0 Lamb wave as the interrogating wave for debonding detection and monitoring. The findings of the study provide improved physical insights into the scattering phenomena, which are important to further advance damage detection techniques and optimize transducer networks.
Optimum design of phononic crystal perforated plate structures for widest bandgap of fundamental guided wave modes and maximized in-plane stiffness
Publisher: Elsevier BV
Date: 04-2016
Experimental characterization of multiple cracks in a cantilever beam utilizing transient vibration data following a probabilistic approach
Publisher: Elsevier BV
Date: 08-2007
Closure to “Reliability Analysis of Single-Degree-of-Freedom Elastoplastic Systems. I: Critical Excitations” by Siu-Kui Au, Heung-Fai Lam, and Ching-Tai Ng
Publisher: American Society of Civil Engineers (ASCE)
Date: 10-2008
Frequency selection and time shifting for maximizing the performance of low-frequency guided wave mixing
Publisher: Elsevier BV
Date: 2023
Damage classification of in-service steel railway bridges using a novel vibration-based convolutional neural network
Publisher: Elsevier BV
Date: 08-2022
EXPERIMENTAL MEASUREMENT AND NUMERICAL SIMULATION OF FUNDAMENTAL ANTI-SYMMETRIC LAMB WAVE SCATTERING IN COMPOSITES
Publisher: AIP
Date: 2011
DOI: 10.1063/1.3591858
Bolted joint integrity monitoring with second harmonic generated by guided waves
Publisher: SAGE Publications
Date: 29-11-2019
Abstract: In this study, the second harmonic generation due to the contact nonlinearity caused by bolt loosening is studied experimentally and numerically using three-dimensional explicit finite element simulations. In particular, it is demonstrated that the magnitude of the second harmonic generation normally increases with the loosening of the bolted joint, and there is a reasonable agreement between the numerical simulations and experimental results. The finite element model, which was validated against the experimentally measured data, is further utilized to investigate an important practical situation when a loosened bolt is weakened by fatigue cracks located at the edge of the hole. The numerical case studies show that the contact nonlinearity and the change of the behaviour of the second harmonic generation with the tightening level are very different to the corresponding results with the fatigue cracks. This identified difference in the second harmonic generation behaviour can serve as an indicator of the bolted joint integrity and thus provide early warning for engineers to make decision on the necessity of carrying out further safety inspections. Overall, the findings of this study provide improved physical insights into second harmonic generation for bolt loosening, which can be used to further advance damage detection techniques using nonlinear guided waves.
Effects of operational variability and damage on structural response signals: A method based on LMS radar image and residual-permutation entropy
Publisher: Elsevier BV
Date: 08-2022
Integrated piezoceramic transducers for imaging damage in composite laminates
Publisher: SPIE
Date: 25-07-2009
DOI: 10.1117/12.840150
Plastic buckling and axial crushing of concrete-filled steel tubes: usage of multiple wood blocks
Publisher: Elsevier BV
Date: 05-2020
On the determination of the third-order elastic constants of homogeneous isotropic materials utilising Rayleigh waves
Publisher: Elsevier BV
Date: 07-2019
DOI: 10.1016/J.ULTRAS.2019.02.006
Abstract: This paper presents a new method for determining the third-order elastic constants (TOECs) of a homogeneous isotropic material utilising the acoustoelastic effect associated with Rayleigh waves. It is demonstrated that the accuracy of the evaluation of TOECs can be substantially improved by supplementing the classical equations of acoustoelasticity, which describe the effect of applied stress on bulk wave speeds, with the nonlinear characteristic equation for the propagation of Rayleigh waves in pre-stressed media. The developed method can be readily implemented for Structural Health Monitoring applications for ex le, the measurement of applied stresses based on the acoustoelastic effect, or the monitoring of near-surface microstructural damage based on the change in magnitude of the TOECs.
Feasibility of early fatigue damage evaluation using the Neutron diffraction method
Publisher: Elsevier BV
Date: 11-2022
Scattering analysis of nonlinear Lamb waves at delaminations in composite laminates
Publisher: SAGE Publications
Date: 11-02-2021
Abstract: This study investigates the higher harmonic generation of the Lamb wave at a delamination due to contact acoustic nonlinearity, which is a clapping phenomenon between sublaminate surfaces due to the Lamb wave interaction with the delamination. In this study, higher harmonics of the Lamb wave induced at the delamination in composite laminates are studied in detail. This study performs both numerical and experimental studies. A three-dimensional finite element model is proposed for predicting the propagation of nonlinear Lamb waves in composite laminates and is verified using experimentally measured data. The results show the proposed numerical model can reasonably predict higher harmonic generated by contact acoustic nonlinearity. It is found that the delamination is the major source of contact acoustic nonlinearity in the composite laminates. A mode conversion study is also carried out to gain further physical insight into the higher harmonic generation of the Lamb wave at the delamination.
Damage detection with the fundamental mode of edge waves
Publisher: SAGE Publications
Date: 27-05-2021
Abstract: 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 cl ed 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 (ES 0 ) – a natural analogue to Rayleigh waves – is weakly dispersive and may decay with propagation distance. The phase and group velocities of the ES 0 wave mode are close to the fundamental shear horizontal (SH 0 ) and symmetric Lamb (S 0 ) wave modes, at low and high frequencies, respectively. It is therefore quite challenging to excite a single ES 0 mode and avoid wave coupling. However, it was found experimentally that at medium range frequencies the ES 0 mode can be decoupled from SH 0 and S 0 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 ex les of distant detection of crack-like and corrosion damage in I-beam sections, which are widely applied in engineering and construction.
Structural health monitoring of partially immersed metallic plates using nonlinear guided wave mixing
Publisher: Elsevier BV
Date: 09-2022
Enhancing the performance of stochastic subspace identification method via energy-oriented categorization of modal components
Publisher: Elsevier BV
Date: 04-2021
Numerical simulation on micro-damage detection in cfrp composites based on nonlinear ultrasonic guided waves
Publisher: Materials Research Forum LLC
Date: 20-02-2021
DOI: 10.21741/9781644901311-39
Abstract: Abstract. Micro-damages such as pores, closed delamination/debonding and fiber/matrix cracks in carbon fiber reinforced plastics (CFRP) are vital factors towards the performance of composite structures, which could collapse if defects are not detected in advance. Nonlinear ultrasonic technologies, especially ones involving guided waves, have drawn increasing attention for their better sensitivity to early damages than linear acoustic ones. The combination of nonlinear acoustics and guided waves technique can promisingly provide considerable accuracy and efficiency for damage assessment and materials characterization. Herein, numerical simulations in terms of finite element method are conducted to investigate the feasibility of micro-damage detection in multi-layered CFRP plates using the second harmonic generation (SHG) of asymmetric Lamb guided wave mode. Contact acoustic nonlinearity (CAN) is introduced into the constitutive model of micro-damages in composites, which leads to the distinct SHG compared with material nonlinearity. The results suggest that the generated second order harmonics due to CAN could be received and adopted for early damage evaluation without matching the phase of the primary waves.
Nonlinear guided wave mixing in pipes for detection of material nonlinearity
Publisher: Elsevier BV
Date: 10-2020
Internal damages detection for structural timber members using low-frequency anti-symmetric guided wave
Publisher: Elsevier BV
Date: 03-2022
Electrochemically produced graphene with ultra large particles enhances mechanical properties of Portland cement mortar
Publisher: Elsevier BV
Date: 02-2020
Damage detection of in-service steel railway bridges using a fine k-nearest neighbor machine learning classifier
Publisher: Elsevier BV
Date: 11-2022
Guided wave damage characterisation in beams utilising probabilistic optimisation
Publisher: Elsevier BV
Date: 12-2009
Large acoustoelastic effect for Lamb waves propagating in an incompressible elastic plate
Publisher: Acoustical Society of America (ASA)
Date: 03-2019
DOI: 10.1121/1.5092604
Abstract: In this paper, the effect of a large pre-stress on the propagation of small litude Lamb waves in an incompressible elastic plate is investigated. Using the theory of incremental elasticity, the dispersion equations, which give the phase velocity of the symmetric and anti-symmetric wave modes as a function of the wavenumber, plate thickness, and pre-stress state, are derived for a general strain energy function. By considering the fourth-order strain energy function of incompressible isotropic elasticity, the correction to the phase velocity due to the pre-stress is obtained implicitly to the second order in the pre-strain/stress, and depends on the second, third, and fourth-order elastic constants. Numerical results are presented to show the dependence of the phase velocity of the Lamb wave modes upon the applied stress. These are compared to the first-order correction, and agree well with the limiting and asymptotic values obtained previously. It is envisaged that the present results may well find important practical applications in various guided wave based ultrasonic techniques utilising gels and rubber-like materials.
Comparative evaluation of in situ stress monitoring with Rayleigh waves
Publisher: SAGE Publications
Date: 17-09-2019
Abstract: The in situ monitoring of stresses provides a crucial input for residual life prognosis and is an integral part of structural health monitoring systems. Stress monitoring is generally achieved by utilising the acoustoelastic effect, which relates the speed of elastic waves in a solid, typically longitudinal and shear waves, to the stress state. A major shortcoming of methods based on the acoustoelastic effect is their poor sensitivity. Another shortcoming of acoustoelastic methods is associated with the rapid attenuation of bulk waves in the propagation medium, requiring the use of dense sensor networks. The purpose of this article is twofold: to demonstrate the application of Rayleigh (guided) waves rather than bulk waves towards stress monitoring based on acoustoelasticity, and to propose a new method for stress monitoring based on the rate of accumulation of the second harmonic of large- litude Rayleigh waves. An experimental study is conducted using the cross-correlation signal processing technique to increase the accuracy of determining Rayleigh wave speeds when compared with traditional methods. This demonstrates the feasibility of Rayleigh wave–based acoustoelastic structural health monitoring systems, which could easily be integrated with existing sensor networks. Second harmonic generation is then investigated to demonstrate the sensitivity of higher order harmonics to stress-induced nonlinearities. The outcomes of this study demonstrate that the sensitivity of the new second harmonic generation method is several orders of magnitude greater than the acoustoelastic method, making the proposed method more suitable for development for online stress monitoring of in-service structures.
Effective elastic properties of a weakly nonlinear particulate composite
Publisher: Elsevier BV
Date: 05-2022
A model‐based method for damage detection with guided waves
Publisher: Hindawi Limited
Date: 18-05-2016
DOI: 10.1002/STC.1884
Reliability Analysis of Single-Degree-of-Freedom Elastoplastic Systems. I: Critical Excitations
Publisher: American Society of Civil Engineers (ASCE)
Date: 10-2007
Double-skin concrete-timber-filled steel columns under compression
Publisher: Elsevier BV
Date: 12-2019
Damage detection in rebar-reinforced concrete beams based on time reversal of guided waves
Publisher: SAGE Publications
Date: 07-2014
Sensor Networks for Structural Health Monitoring
Publisher: Hindawi Limited
Date: 17-01-2020
DOI: 10.1155/2020/3060672
Ambient- and oven-cured geopolymer concretes under active confinement
Publisher: Elsevier BV
Date: 12-2019
Locating delaminations in laminated composite beams using nonlinear guided waves
Publisher: Elsevier BV
Date: 2017
Effect of uniaxial stress on the propagation of higher-order Lamb wave modes
Publisher: Elsevier BV
Date: 11-2016
Debonding detection in CFRP-retrofitted reinforced concrete structures using nonlinear Rayleigh wave
Publisher: Elsevier BV
Date: 06-2019
Scattering of the fundamental anti-symmetric Lamb wave at through-thickness notches in isotropic plates
Publisher: Springer Science and Business Media LLC
Date: 02-04-2016
A sub-laminate based higher-order model for bending of laminated beams containing multiple delaminations
Publisher: Elsevier BV
Date: 08-2022
Influence of crack opening and incident wave angle on second harmonic generation of Lamb waves
Publisher: IOP Publishing
Date: 20-04-2018
Prediction and Measurement of Lamb Wave from Debondings at Structural Features in Composite Laminates
Publisher: Trans Tech Publications, Ltd.
Date: 06-2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/KEM.558.139
Abstract: The interaction of the fundamental anti-symmetric Lamb wave (A 0 ) with debondings at structural features is investigated using experimental data and finite element (FE) simulations. In this study explicit three-dimensional (3D) FE simulations are employed, which allows the study of the scattered wave along different propagation directions. Good agreement between the FE predictions and the measurements are obtained that demonstrates that the 3D FE scattering model is able to accurately predict the Lamb wave scattering characteristics at debondings. The study show that the characteristics of Lamb wave reflected from the debondings at the structure feature is much more complicated than that from defects in flat composite laminates. Parameter studies show that the backward and forward scattering coefficient of Lamb wave is a function of debonding size to wavelength ratio and debonding location. This shows the potential of employing Lamb wave to identify the size and monitor the growth of the debondings. The findings of the study provide improved physical insights into the scattering phenomena, which are important to further advance damage detection techniques for complex structures made by composite laminates.
CFRP-reinforced concrete-filled steel tubes with timber core under axial loading
Publisher: Elsevier BV
Date: 06-2019
A baseline‐free and non‐contact method for detection and imaging of structural damage using 3D laser vibrometry
Publisher: Hindawi Limited
Date: 10-06-2016
DOI: 10.1002/STC.1894
Guided wave-based identification of multiple cracks in beams using a Bayesian approach
Publisher: Elsevier BV
Date: 02-2017
Quasistatic pulse generation of ultrasonic guided waves propagation in composites
Publisher: Elsevier BV
Date: 04-2022
The fundamental ultrasonic edge wave mode: Propagation characteristics and potential for distant damage detection
Publisher: Elsevier BV
Date: 07-2021
Nonlinear Guided-Wave Mixing for Condition Monitoring of Bolted Joints
Publisher: MDPI AG
Date: 27-07-2021
DOI: 10.3390/S21155093
Abstract: Bolted joints are fundamental to numerous structural components in engineering practice. Nevertheless, their failure or even their loosening can lead to insufficient performance and reduced structural safety. This study presents a theoretical development and experimental investigation into nonlinear guided-wave mixing for integrity monitoring of bolted joints in plates. Combinational harmonics generated due to nonlinear Lamb wave mixing and contact acoustic nonlinearity at the bolted joints were used to evaluate the applied torque level in the joint. The area of the power spectral density in the region of the sum combinational harmonic bandwidth is found to be highly correlated to the applied torque level at the joint. Moreover, the effect of the number of cycles and thus the time duration of the excitation is investigated. The results show that the combinational harmonics remain robust for different numbers of cycles in detecting bolt loosening. The findings presented in this study also provide physical insight into the phenomena of nonlinear Lamb wave mixing for evaluating applied torque in bolted joints, and the results help further advance the use of nonlinear guided waves for damage detection.
Multicrack Detection on Semirigidly Connected Beams Utilizing Dynamic Data
Publisher: American Society of Civil Engineers (ASCE)
Date: 2008
Mechanics and Evaluation of Early Damage
Publisher: Springer International Publishing
Date: 2019
An efficient modelling technique for simulation of guided waves in delaminated composite and sandwich structures
Publisher: Elsevier BV
Date: 12-2023
Early damage detection of metallic plates with one side exposed to water using the second harmonic generation of ultrasonic guided waves
Publisher: Elsevier BV
Date: 07-2022
Analytical and finite element prediction of Lamb wave scattering at delaminations in quasi-isotropic composite laminates
Publisher: Elsevier BV
Date: 10-2012
RETRACTED: System identification of an enclosure with leakages using a probabilistic approach
Publisher: Elsevier BV
Date: 05-2009
Damage detection of ultra-high-performance fibre-reinforced concrete using a harmonic wave modulation technique
Publisher: Elsevier BV
Date: 12-2021
Amplitude-Modulation Vibro-Acoustic Technique for Damage Evaluation
Publisher: SAGE Publications
Date: 27-06-2023
DOI: 10.1177/14759217221106209
Abstract: This study proposes an litude-modulation vibro-acoustic (AMVA) technique to track the evolution of thermal damage in pristine graphene mortar. In the proposed litude-modulation technique, the pump wave is litude-modulated using three different methods: (1) the pure litude-modulated (PAM) method, (2) the suppressive litude-modulated (SAM) method and (3) the transmitted litude-modulated (TAM) method. The nonlinear parameters [Formula: see text], [Formula: see text] and [Formula: see text] corresponding to the PAM, SAM and TAM methods, respectively, are theoretically established and experimentally demonstrated that the nonlinear parameters associated with the material nonlinearity, and they can be used to quantitatively characterize different damage stages of thermal damage. Meanwhile, the resonant frequency (RF) and ultrasonic pulse velocity (UPV) tests are conducted. The linear measurements, dynamic elastic modulus [Formula: see text] obtained from RF test and ultrasonic pulse velocity [Formula: see text] collected by UPV test, are used to compare with the nonlinear parameters. The results show that the proposed AMVA technique is more sensitive and feasible to serve as the tool for thermal damage detection in cement-based material compared with the conventional RF and UPV techniques.
A probabilistic approach for quantitative identification of multiple delaminations in laminated composite beams using guided waves
Publisher: Elsevier BV
Date: 11-2016
Assessment of damage in composites using static component generation of ultrasonic guided waves
Publisher: IOP Publishing
Date: 15-03-2022
Abstract: Static component (SC) generation of guided waves (GWs), which combines the high sensitivity of acoustic nonlinearity to micro-damage and low attenuative effect, has great potential for damage assessment in large composite structures. The present work explores the use of SC generation of GWs for assessing damages in carbon fiber reinforced polymer (CFRP) composite laminates. The features including mode, waveform, and cumulative effect of the generated SC in composites are numerically investigated by three-dimensional finite element modeling and simulation. A dynamic displacement measurement method based on piezoelectric transducers is accordingly proposed and experimentally verified. The cumulative SC pulse generated from primary GW tone-burst with a finite duration, is observed and verified numerically and experimentally. It is found that the magnitude of the generated SC pulse is linearly proportional to the quadratic material nonlinearity. Experimental results demonstrate that the generated SC pulse of GW under group velocity matching condition, is an effective means to assess the hygrothermal damage and low-velocity impact damage in CFRP composite plates. The performed experimental examination validates the feasibility of the proposed approach for damage assessment in CFRP composites.
A probabilistic method for the detection of obstructed cracks of beam-type structures using spatial wavelet transform
Publisher: Elsevier BV
Date: 04-2008
Investigation on the damping of rectangular water tank with bottom-mounted vertical baffles: Hydrodynamic interaction and frequency reduction effect
Publisher: Elsevier BV
Date: 10-2021
Related Organisations
Related Funding Activities
Discovery Projects - Grant ID: DP210103307
Start Date: 10-2021
End Date: 10-2024
Amount: $440,624.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP210100415
Start Date: 12-2022
End Date: 12-2025
Amount: $372,554.00
Funder: Australian Research Council
View Funded ActivityDiscovery Early Career Researcher Award - Grant ID: DE130100261
Start Date: 03-2013
End Date: 11-2017
Amount: $375,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP160102233
Start Date: 2016
End Date: 06-2020
Amount: $330,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP200102300
Start Date: 03-2020
End Date: 07-2024
Amount: $450,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE150100094
Start Date: 06-2015
End Date: 12-2018
Amount: $400,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE180100041
Start Date: 04-2018
End Date: 10-2019
Amount: $680,320.00
Funder: Australian Research Council
View Funded Activity