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Interaction of the primary anti-symmetric Lamb mode (Ao) with symmetric delaminations: Numerical and experimental studies
Published in
2009
Volume: 18
   
Issue: 8
Abstract
The interaction of an ultrasonic guided Lamb wave mode with delamination type defects in a quasi-isotropic laminated composite plate has been studied, using both simulations and experiments. In a laminated composite plate with a symmetric delamination, when the primary anti-symmetric mode, Ao, is incident at the entrance and exit of a delamination, it generates a new mode, So, that is confined only to sub-laminates and undergoes multiple reflections in the delaminated region. It was observed that only the incident and mode-converted Ao modes propagate in the main laminate. The two modes reverberate between the two ends of the delaminations while undergoing multiple mode conversions, leading to a trail of signals that is captured by the finite element model. The numerical observations were validated using experiments conducted using air coupled ultrasonic transducers. © 2009 IOP Publishing Ltd.
About the journal
JournalSmart Materials and Structures
ISSN09641726
Open AccessNo
Concepts (20)
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    AIR-COUPLED ULTRASONIC TRANSDUCER
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    Anti-symmetric
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    Finite element models
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    Guided lamb waves
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    LAMB MODES
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    Laminated composite plates
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    MULTIPLE MODES
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    MULTIPLE REFLECTIONS
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    Numerical and experimental study
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    ELECTROACOUSTIC TRANSDUCERS
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    Laminates
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    Laminating
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    Plates (structural components)
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    Simulators
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    Steel sheet
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    SULFUR COMPOUNDS
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    Ultrasonic transducers
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    Ultrasonic waves
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    Ultrasonics
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    Delamination