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dc.contributor.authorYu, Xudongen_US
dc.contributor.authorZuo, Pengen_US
dc.contributor.authorXiao, Jingen_US
dc.contributor.authorFan, Zhengen_US
dc.identifier.citationYu, X., Zuo, P., Xiao, J. & Fan, Z. (2019). Detection of damage in welded joints using high order feature guided ultrasonic waves. Mechanical Systems and Signal Processing, 126, 176-192.
dc.description.abstractTopographical features such as welds, stiffeners, and bends in plate-like structures have been identified as special local waveguides, which are able to render ultrasonic wave energy preferentially guided along themselves. Such feature guided waves (FGW) at low frequencies have been reported in the literature as an effective screening tool for long-range features, which, however, can only detect relatively large defects. In this study, the existence of high order FGW modes, categorized into multiple wave families, are revealed via the modal analysis of an unbounded welded plate at high frequencies, by using the semi-analytical finite element (SAFE) approach. These FGWs exhibit strong mode confinement in specific regions of the weld, which can potentially offer enhanced interrogation of the localized area in long welds and provide improved detection sensitivity to small defects. A series of high order shear horizontal (SH) type weld-guided modes are investigated in both three-dimensional finite element (3D FE) simulations and experiments, for detecting axial and transverse cracks of sub-wavelength size in the weld bead. A new superposition technique is proposed to coherently enhance the amplitude of the selected mode in a multi-modal waveform, leading to an attractive single-mode inspection capability at high frequencies. Both small cracks are identified numerically and experimentally in the superposed reflection of the -like weld-guided wave, and results are in close agreement. The feasibility of using high order weld-guided modes for inspecting small defects inside the weld has been demonstrated.en_US
dc.description.sponsorshipSingapore Maritime Institute (SMI)en_US
dc.relation.ispartofMechanical Systems and Signal Processingen_US
dc.rights© 2019 Elsevier Ltd. All rights reserved.en_US
dc.subjectEngineering::Mechanical engineeringen_US
dc.titleDetection of damage in welded joints using high order feature guided ultrasonic wavesen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.subject.keywordsGuided Ultrasonic Wavesen_US
dc.subject.keywordsFeature Guiding Effecten_US
dc.description.acknowledgementThis work was supported by the Singapore Maritime Institute under SMI Simulation and Modelling R&D Programme. The authors are grateful to Professor Michael Lowe from Imperial College London for helpful discussions. Additionally, the authors would like to thank Keppel Singmarine for provision of the welded plates.en_US
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