Effect of delamination on lamb wave velocity in cross-ply laminates

Structural health monitoring systems have recently become the focus of attention for reducing maintenance costs and improving safety and reliability. There is need for a monitoring system that can detect damage quickly and reliably. Lamb wave inspection is an attractive method for composite laminate...

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Veröffentlicht in:Journal of materials science letters 2002-12, Vol.21 (24), p.1891-1893
Hauptverfasser: TOYAMA, N, KIKUSHIMA, Y, TAKATSUBO, J
Format: Artikel
Sprache:eng
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Zusammenfassung:Structural health monitoring systems have recently become the focus of attention for reducing maintenance costs and improving safety and reliability. There is need for a monitoring system that can detect damage quickly and reliably. Lamb wave inspection is an attractive method for composite laminates because a Lamb wave can propagate a long distance and its velocity is sensitive to the in-plane stiffness of laminates. One of the authors demonstrated that measuring the Lamb wave velocity can quantitatively monitor the number of transverse cracks in cross-ply laminates [1]. In this letter, we measured the stiffness and the lowest order symmetric (So) mode velocity for GFRP and CFRP cross-ply laminates with simulated delaminations. The change of the stiffness and the So mode velocity were predicted analytically as functions of the delamination length. The predicted values were then compared with the experimental results. This research led us to propose measuring the Lamb wave velocity as a simple but superior monitoring system for delamination.
ISSN:0261-8028
DOI:10.1023/a:1021686608552