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Interaction of Lamb mode (Ao) with structural discontinuity and generation of "turning modes" in a T-joint
Published in
2011
PMID: 21262513
Volume: 51
   
Issue: 5
Pages: 586 - 595
Abstract
In the present work, the interaction of the fundamental anti-symmetric guided Lamb mode (Ao) with a structural discontinuity in a composite structure was studied through Finite Element numerical simulations and experiments. The structural component selected for this study was a T-joint section made from glass/epoxy material. This co-cured composite structure is made-up of an upper shell (skin) and a spar as the sub-components. It was observed that when Ao mode interacts with the junction (structural discontinuity) of these sub-components, a mode-converted So mode is generated. Experiments were conducted using air-coupled ultrasound to validate the numerical simulations. The back-propagating "Turning modes", which propagate from the thin region to the spar web and vice versa, were also numerically simulated and experimentally verified. © 2010 Elsevier B.V. All rights reserved.
About the journal
JournalUltrasonics
ISSN0041624X
Open AccessNo
Concepts (30)
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    AIR-COUPLED ULTRASOUNDS
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    Anti-symmetric
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    CO-CURED
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    FEA
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    FINITE ELEMENT NUMERICAL SIMULATION
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    Glass/epoxy
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    LAMB MODES
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    Lamb wave
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    Numerical simulation
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    Structural component
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    Structural discontinuity
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    SUB-COMPONENTS
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    T JOINTS
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    Computer simulation
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    Elastic waves
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    Ultrasonic waves
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    Structure (composition)
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    Article
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    Computer assisted diagnosis
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    Echography
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    Materials
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    Materials testing
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    Methodology
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    Radiation scattering
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    Theoretical model
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    Image interpretation, computer-assisted
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    MANUFACTURED MATERIALS
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    Models, theoretical
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    Scattering, radiation
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    Ultrasonography