Volume 39, Issue 5 (September 2011)

    A Global Method for the Identification of Failure Modes in Fiberglass Using Acoustic Emission

    (Received 27 December 2010; accepted 20 April 2011)

    Published Online: 2011

    CODEN: JTEOAD

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    Abstract

    The various failure mechanisms in bidirectional glass/epoxy laminates loaded in tension are identified using acoustic emission (AE) analysis. AE data recorded during the tensile testing of a single layer specimen are used to identify matrix cracking and fiber failure, while delamination signals are characterized using a two-layer specimen with a pre-induced defect. Parametric studies using AE count rate and cumulative counts allowed damage discrimination at different levels of loading and Fuzzy C-means clustering associated with principal component analysis were used to discriminate between failure mechanisms. The two above methods led to AE waveform selection: On selected waveforms, Fast Fourier Transform (FFT) enabled calculating the frequency content of each damage mechanism. Continuous wavelet transform allowed identifying frequency range and time history for failure modes, whilst noise content associated with the different failure modes was calculated and removed by discrete wavelet transform. Short Time FFT finally highlighted the possible failure mechanism associated with each signal.


    Author Information:

    Arumugam, V.
    Department of Aerospace Engineering, Anna University, Chennai,

    Kumar, C. Suresh
    Department of Aerospace Engineering, Anna University, Chennai,

    Santulli, C.
    Department of Chemical Engineering, Materials and Environment, Università La Sapienza, Rome,

    Sarasini, F.
    Department of Chemical Engineering, Materials and Environment, Università La Sapienza, Rome,

    Stanley, A. Joseph
    MIT Campus, Anna University, Chennai,


    Stock #: JTE103730

    ISSN: 0090-3973

    DOI: 10.1520/JTE103730

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    Author
    Title A Global Method for the Identification of Failure Modes in Fiberglass Using Acoustic Emission
    Symposium , 0000-00-00
    Committee D30