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    Acoustic emission assessment of interface cracking in thermal barrier coatings

    Access Status
    Fulltext not available
    Authors
    Yang, L.
    Zhong, Z.
    Zhou, Y.
    Zhu, W.
    Zhang, Z.
    Cai, C.
    Lu, Chunsheng
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Yang, L. and Zhong, Z. and Zhou, Y. and Zhu, W. and Zhang, Z. and Cai, C. and Lu, C. 2016. Acoustic emission assessment of interface cracking in thermal barrier coatings. Acta Mechanica Sinica. 32 (2): pp. 342-348.
    Source Title
    Acta Mechanica Sinica
    DOI
    10.1007/s10409-015-0514-6
    ISSN
    0567-7718
    School
    Department of Mechanical Engineering
    URI
    http://hdl.handle.net/20.500.11937/58706
    Collection
    • Curtin Research Publications
    Abstract

    © 2015, The Chinese Society of Theoretical and Applied Mechanics; Institute of Mechanics, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg.In this paper, acoustic emission (AE) and digital image correlation methods were applied to monitor interface cracking in thermal barrier coatings under compression. The interface failure process can be identified via its AE features, including buckling, delamination incubation and spallation. According to the Fourier transformation of AE signals, there are four different failure modes: surface vertical cracks, opening and sliding interface cracks, and substrate deformation. The characteristic frequency of AE signals from surface vertical cracks is 0.21 MHz, whilst that of the two types of interface cracks are 0.43 and 0.29 MHz, respectively. The energy released of the two types of interface cracks are 0.43 and 0.29 MHz, respectively. Based on the energy released from cracking and the AE signals, a relationship is established between the interface crack length and AE parameters, which is in good agreement with experimental results.

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