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Acoustic emission assessment of interface cracking in thermal barrier coatings

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Abstract

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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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grants 11472237, 11002122, 51172192, and 11272275).

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Authors and Affiliations

  1. Key Laboratory of Key Film Materials & Application for Equipment (Hunan Province), School of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, China

    Li Yang, Zhi-Chun Zhong, Yi-Chun Zhou, Wang Zhu, Zhi-Biao Zhang & Can-Ying Cai

  2. Key Laboratory of Low Dimensional Materials & Application Technology (Ministry of Education), School of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, China

    Li Yang, Zhi-Chun Zhong, Yi-Chun Zhou, Wang Zhu, Zhi-Biao Zhang & Can-Ying Cai

  3. Department of Mechanical Engineering, Curtin University, Perth, WA, 6845, Australia

    Chun-Sheng Lu

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  1. Li Yang
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  2. Zhi-Chun Zhong
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  3. Yi-Chun Zhou
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  4. Wang Zhu
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Correspondence to Li Yang.

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Yang, L., Zhong, ZC., Zhou, YC. et al. Acoustic emission assessment of interface cracking in thermal barrier coatings. Acta Mech. Sin. 32, 342–348 (2016). https://doi.org/10.1007/s10409-015-0514-6

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  • DOI: https://doi.org/10.1007/s10409-015-0514-6

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