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.
Ultrasonic NDT of a thin elastic layer on a viscoelastic substrate
Ultraschall-ZfP einer dünnen elastischen Schicht auf viskoelastischer Unterlage
Materials Evaluation ; 65 , 3 ; 323-328
2007
6 Seiten, 9 Bilder, 3 Tabellen, 8 Quellen
Aufsatz (Zeitschrift)
Englisch
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