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Quantitative assessment of the surface crack density in thermal barrier coatings

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  • Solid Mechanics
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Abstract

In this paper, a modified shear-lag model is developed to calculate the surface crack density in thermal barrier coatings (TBCs). The mechanical properties of TBCs are also measured to quantitatively assess their surface crack density. Acoustic emission (AE) and digital image correlation methods are applied to monitor the surface cracking in TBCs under tensile loading. The results show that the calculated surface crack density from the modified model is in agreement with that obtained from experiments. The surface cracking process of TBCs can be discriminated by their AE characteristics and strain evolution. Based on the correlation of energy released from cracking and its corresponding AE signals, a linear relationship is built up between the surface crack density and AE parameters, with the slope being dependent on the mechanical properties of TBCs.

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Authors and Affiliations

  1. Key Laboratory of Low Dimensional Materials & Application Technology (Ministry of Education)/Faculty of Materials, Optoelectronic & Physics, Xiangtan University, 411105, Xiangtan, China

    Li Yang, Zhi-Chun Zhong & Yi-Chun Zhou

  2. Department of Mechanical Engineering, Curtin University, Perth, Western Australia, 6845, Australia

    Chun-Sheng Lu

Authors
  1. Li Yang
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  2. Zhi-Chun Zhong
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  3. Yi-Chun Zhou
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  4. Chun-Sheng Lu
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Corresponding authors

Correspondence to Li Yang or Yi-Chun Zhou.

Additional information

The project was supported by the National Natural Science Foundation of China (11002122, 51172192, 11272275, and 10828205), the Natural Science Foundation of Hunan Province (11JJ4003), and the Key Project of Scientific Research Conditions in Hunan Province (2012TT2040). The specimens were provided by the AVIC Shenyang Liming Aero-Engine (GROUP) Corporation Ltd.

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Yang, L., Zhong, ZC., Zhou, YC. et al. Quantitative assessment of the surface crack density in thermal barrier coatings. Acta Mech Sin 30, 167–174 (2014). https://doi.org/10.1007/s10409-014-0019-8

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  • DOI: https://doi.org/10.1007/s10409-014-0019-8

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