Stiffened graphite/epoxy composite panels with box and T-sections representative of aircraft, naval and automotive structural sub-elements were fabricated in-house. The panels were subjected to baseline nondestructive evaluation (NDE) using ultrasonics and vibration techniques. Acoustical properties of the composite panels were measured using ASTM C522-87. The panels were subjected to room temperature static compression tests in conjunction with in-situ acoustic emission (AE) monitoring. The ultrasonic reflected pulse amplitudes were found to be very sensitive to skin-to-core interface conditions; a profile of amplitude measurements provided exact locations of bond weaknesses. From vibration tests, it was seen that following compression testing, the damping ratio value of the box-section panel exhibited nearly 50 % increase due to the accumulated damage in the panel. Acoustical airflow resistance of the box-section was significantly higher than the T-section stiffened panel; exhibiting better acoustical properties for the box-section composites. From AE parameters, major failure mechanisms due to compression loading, such as shearing of the box section, local microbuckling, fiber fracture and matrix macrocracking were identified.


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    Title :

    Compression behavior and nondestructive evaluation of stiffened panels


    Additional title:

    Druckverhalten und zerstörungsfreie Bewertung von versteiften Paneelen


    Contributors:
    Vaidya, U.K. (author) / Wheeler, R. (author) / Mahfuz, H. (author) / Jeelani, S. (author)


    Publication date :

    1995


    Size :

    11 Seiten, 14 Bilder, 2 Tabellen, 9 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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