Two types of ultrasonic sensors are presented for structural health monitoring (SHM) and non-destructive testing (NDT) of graphite/epoxy (Gr/Ep) composites of thickness ranging from 1 mm to 27.9 mm. These piezoelectric film based sensors are fabricated using a sol-gel spray technique. The center operation frequency of these sensors ranged from 1.3 MHz to 10.5 MHz. For the first sensor type, piezoelectric films of thickness greater-than 60 micrometer were deposited directly onto planar and curved Gr/Ep composites surfaces as integrated sensors. Ultrasonic signals propagating in a distance of more than 300 mm have been obtained. Anisotropy of 0 deg and 90 deg cross ply Gr/Ep composite was measured. For the second sensor type, piezoelectric films were coated onto a 50 micrometer thick polyimide membrane as flexible sensors that could be attached to a host composite structure with planar or curved surfaces. The flexibility of such FUTs is achieved due to the thin polymide, porous PZT/PZT ceramics and electrodes. An induction type non-contact method for the interrogation of the Gr/Ep composites using integrated sensors is also presented. Such non-contact technique may be desired for NDT of rotating composite components.


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    Titel :

    Structural health monitoring of composites using integrated ultrasonic transducers


    Weitere Titelangaben:

    Bewertung der strukturellen Unversehrtheit von Verbundwerkstoff mittels integrierter Ultraschallwandler


    Beteiligte:
    Kobayashi, M. (Autor:in) / Wu, K.T. (Autor:in) / Song, L. (Autor:in) / Jen, C.K. (Autor:in) / Mrad, N. (Autor:in)


    Erscheinungsdatum :

    2008


    Format / Umfang :

    7 Seiten, 10 Quellen





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch







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