Acoustic emission measurements were used to detect fatigue cracks in a full-scale aircraft structure during ground durability and damage tolerance testing. Measurements were made using a 16-channel data acquisition system receiving signals from piezoelectric sensor elements. Fatigue cycling loads were applied at various loading points on the aircraft structure to simulate the known flight load spectra measured in flight. Acoustic emission data were recorded for 700 equivalent flying hours and analyzed at intervals. After 700 hours of testing it was clear from the acoustic emission data that significant crack growth was occurring in the starboard wing skin. Fasteners were removed to inspect fastener holes in the damage area identified by acoustic emission. Fatigue cracks were detected in several holes using eddy current only after the structure was loaded to open the cracks. Acoustic emission data were further analyzed to reconstruct the history of defect growth and to separate the crack growth emission data from crack face rubbing data. The tests show that cracks originating inside fastener holes can be detected easily by acoustic emission without the removal of fasteners. Acoustic emission monitoring is shown to be superior to conventional nondestructive testing in locating fatigue cracks and can be used to determine load conditions leading to crack growth.


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    Titel :

    Acoustic Emission Monitoring of Aging Aircraft Structures


    Beteiligte:
    S. L. Mcbride (Autor:in) / M. R. Viner (Autor:in) / M. D. Pollard (Autor:in)

    Erscheinungsdatum :

    1993


    Format / Umfang :

    13 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




    Acoustic emission monitoring of aging aircraft structures

    McBride, S.L. / Viner, M.R. / Pollard, M.D. | Tema Archiv | 1992


    Acoustic emission for monitoring aircraft structures

    Holford, K M / Pullin, R / Evans, S L et al. | SAGE Publications | 2009


    Acoustic emission for monitoring aircraft structures

    Holford, K.M. / Pullin, R. / Evans, S.L. et al. | Tema Archiv | 2009


    Acoustic emission for monitoring aircraft structures

    Holford, K.M. | Online Contents | 2009