Recently, adhesive bonding technology has begun to play a more prominent role in automotive industry. Nondestructive evaluation of the adhesive joints is a challenging task for many reasons: access to the bond is only available from one side, the acoustic impedance mismatch between steel and the adhesive material is very large, and the thickness of the adhesive layer may be significantly varied. Many ultrasonic techniques for NDE of adhesive bonds have been proposed, including time and spectral domain methods. Generally speaking, however, the lateral resolution of these techniques is not high enough to facilitate the proper evaluation of automotive joints whose widths are typically 10 - 15 mm. To increase this resolution in the pulse-echo mode, we employed flat, highly damped ultrasonic transducers having an element size of approximately 3 - 6 mm. In this case, the small transducer diameter causes strong diffraction in the ultrasonic wave as well as mode conversion at the interfaces between the layers of the joint, resulting in a very complex received waveform. To detect disbonds within the joint, the echo signal is compared with a reference waveform that was obtained from the first metal sheet outside of the joint. In the case of disbonding at the front metal-adhesive interface, the received and reference waveforms are very close. Disbonds at the rear adhesive-metal interface cause a phase inversion of the reflected response; this can be estimated by reference waveform subtraction. The proposed technique has been tested using a set of steel and aluminum samples with the varying adhesive layer thicknesses.


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    Titel :

    Pulse-echo ultrasonic NDE of adhesive bonds in automotive assembly


    Weitere Titelangaben:

    Impulsecho-Ultraschall-ZfP von Klebverbindungen in Automobilkomponenten


    Beteiligte:
    Maev, R.G. (Autor:in) / Titov, S. (Autor:in)


    Erscheinungsdatum :

    2006


    Format / Umfang :

    8 Seiten, 7 Bilder, 1 Tabelle, 7 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Datenträger


    Sprache :

    Englisch