External fuel tanks for H53 helicopters have a complex wall structure comprising (in order) a thin aluminum liner, a fiberglass winding, a foam-filled honeycomb structure and another fiberglass winding. With time, the liner corrodes, which may lead to fuel leakage resulting in expensive repairs and maintenance, replacement of the fuel tank, or possibly a catastrophic failure. Therefore, a nondestructive measurement of the liner thickness is of great engineering importance. From the point of view of ultrasonic nondestructive testing (NDT), the four layer tank wall may be modeled as an elastic layer (aluminum) on a viscoelastic substrate (fiberglass/epoxy composite). It is shown that the four layer tank wall may be modeled as an elastic layer (aluminum) on a viscoelastic substrate (fiberglass/epoxy composite). Using conventional ultrasonic, a technique for the measurement of the liner thickness is presented.


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    Title :

    Ultrasonic NDT of a thin elastic layer on a viscoelastic substrate


    Additional title:

    Ultraschall-ZfP einer dünnen elastischen Schicht auf viskoelastischer Unterlage


    Contributors:
    Bijai, R.R. (author) / Ganpatye, A.S. (author) / Kinra, V.K. (author)

    Published in:

    Materials Evaluation ; 65 , 3 ; 323-328


    Publication date :

    2007


    Size :

    6 Seiten, 9 Bilder, 3 Tabellen, 8 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English