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Interfacial Residual Stress Analysis of Thermal Spray Coatings by Miniature Ring-Core Cutting Combined with DIC Method

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Abstract

The residual stress in thermal barrier coatings (TBCs) fabricated from coating deposition plays a vital role in the coating design and processing parameters optimization. The main objective of the present work is to determine the interfacial residual stress in TBCs by means of miniature ring-core cutting and the digital image correlation (DIC) method. Both the ring-core cutting and the dot pattern used for DIC deformation measurement are implemented by the focused ion beam (FIB) milling on the cross-section of a coating. A finite element model (FEM) is developed to simulate the ring-core cutting process. From the FEM, the calibration coefficients are determined for general applications. The surface of the ring-core containing dot patterns is recorded before and after the FIB milling process. DIC technique is then performed to calculate the surface displacement caused by the release of residual stresses due to the cutting. Results demonstrate that the interfacial residual stress in TBCs is nearly in a uniaxial stress state and has a tendency to be compressive toward the interface. Finally, essential aspects of the technique are discussed.

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Acknowledgements

The authors are grateful to the financial supported by the National Basic Research Program of China (“973” Project) (Grant No.2010CB631005, 2011CB606105), the National Natural Science Foundation of China (Grant Nos. 11172151, 90916010), Specialized Research Fund for the Doctoral Program of Higher Education (Grant No.20090002110048).

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Authors and Affiliations

  1. AML, Department of Engineering Mechanics, Tsinghua University, Beijing, 100084, China

    J. G. Zhu, H. M. Xie, Y. J. Li & Z. X. Hu

  2. College of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, Jiangsu, 212013, China

    J. G. Zhu

  3. Institute of Physics, Chinese Academic of Sciences, Beijing, 100081, China

    Q. Luo & C. Z. Gu

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  1. J. G. Zhu
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  2. H. M. Xie
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  4. Z. X. Hu
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Correspondence to H. M. Xie.

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Zhu, J.G., Xie, H.M., Li, Y.J. et al. Interfacial Residual Stress Analysis of Thermal Spray Coatings by Miniature Ring-Core Cutting Combined with DIC Method. Exp Mech 54, 127–136 (2014). https://doi.org/10.1007/s11340-012-9640-2

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  • DOI: https://doi.org/10.1007/s11340-012-9640-2

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