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In-Situ Characterization on Fracture Toughness of Thermal Barrier Coatings Under Tension by J-Integral with Digital Image Correlation at High Temperatures

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Abstract

Background

The elastic–plastic fracture toughness (Jc) is an important mechanical parameter for studying the failure behavior of air plasma-sprayed (APS) thermal barrier coatings (TBC) at high temperatures.

Objective

This study aims to: (1) develop an effective test method to characterize the Jc of TBC at high temperatures; (2) acquire accurate Jc data for TBC at high temperatures; (3) analyze the influence of plasticity of top-coat on the Jc characterization.

Methods

The elastic–plastic Ramberg–Osgood equation of the ceramic top-coat and the deformation fields of single edge notched tension (SENT) specimens were measured by high-temperature in-situ tension with digital image correlation (DIC) system. The Jc of TBC was calculated by the numerical J-integral with DIC-measured (DIC-J) deformation fields by adopting Ramberg–Osgood equation of the top-coat. The finite element analysis (FEA) method was adopted to analyze the influence of plasticity of top-coat on the Jc characterization.

Results

The curves of Jc varying with crack propagation length (Δa) of TBC were obtained and were expressed as JR = 24.47 × [ 1 + 1.0446 × (\(\widetilde{\Delta a}\))0.7624] J/m2 and JR = 16.52 × [ 1 + 1.4806 × (\(\widetilde{\Delta a}\))0.6742] J/m2 at 800 and 1000 ℃, respectively.

Conclusions

A high-temperature in-situ tensile test of SENT specimens combined with the DIC-J method was developed to characterize Jc of TBC. The Jc of TBC displays a rising resistance curve behavior, and FEA results indicated that Jc would be underestimated without considering the plasticity of the top-coat at 800 and 1000 ℃.

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Data Availability

Raw images and data generated during the current study are available from the corresponding author upon reasonable request.

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Acknowledgements

This work is supported by National Natural Science Foundation of China (Nos.12172048, 12027901) and National Science and Technology Major Project (2019-VII-0007-0147).

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  1. Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing, 100081, China

    H. Bai, Z. Qu, H. Yang & D. Fang

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Bai, H., Qu, Z., Yang, H. et al. In-Situ Characterization on Fracture Toughness of Thermal Barrier Coatings Under Tension by J-Integral with Digital Image Correlation at High Temperatures. Exp Mech (2024). https://doi.org/10.1007/s11340-024-01061-1

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