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It is important to investigate the mechanical performances of (Gd0.9Yb0.1)2Zr2O7 (GYbZ) materials deposited on irregular substrates for improving new thermal barrier coatings. Three-point bending fracture characteristics of freestanding GYbZ coating prepared by supersonic plasma sprayed (SPS) technique were investigated with the help of digital image correlation technique. The cracking time, crack propagation path, and mechanical properties of GYbZ coating were obtained. Meanwhile, the X-ray computed tomography technique was introduced to scan the microstructure of freestanding GYbZ coatings, which are used to establish three-dimensional (3D) finite element model by using the Avizo software. The brittle cracking criterion was applied to describe the bending fracture process of GYbZ coatings. The critical cracking strain was estimated as 0.36%±0.03% by repeatedly comparing the difference between the experimental and simulated curves. The results would be extended to predict the dangerous region and failure mechanisms of GYbZ coatings deposited on irregular substrate during finite element simulations.


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Bending fracture behavior of freestanding (Gd0.9Yb0.1)2Zr2O7 coatings by using digital image correlation and FEM simulation with 3D geometrical reconstruction

Show Author's information Weiguo MAOaYujie WANGaJun SHIaHuiyu HUANGaYuncheng WANGbLiang LVbHaoyong YANGaChen ZOUaCuiying DAIa( )Xiaolei ZHUc( )Daining FANGd
School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China
Department of Science and Technology Engineering, AECC South Industry Co., Ltd., Xiangtan 412002, China
School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 210009, China
Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China

Abstract

It is important to investigate the mechanical performances of (Gd0.9Yb0.1)2Zr2O7 (GYbZ) materials deposited on irregular substrates for improving new thermal barrier coatings. Three-point bending fracture characteristics of freestanding GYbZ coating prepared by supersonic plasma sprayed (SPS) technique were investigated with the help of digital image correlation technique. The cracking time, crack propagation path, and mechanical properties of GYbZ coating were obtained. Meanwhile, the X-ray computed tomography technique was introduced to scan the microstructure of freestanding GYbZ coatings, which are used to establish three-dimensional (3D) finite element model by using the Avizo software. The brittle cracking criterion was applied to describe the bending fracture process of GYbZ coatings. The critical cracking strain was estimated as 0.36%±0.03% by repeatedly comparing the difference between the experimental and simulated curves. The results would be extended to predict the dangerous region and failure mechanisms of GYbZ coatings deposited on irregular substrate during finite element simulations.

Keywords:

thermal barrier coating, X-ray computed tomography, bending fracture, geometrical reconstruction, cracking strain
Received: 24 January 2019 Revised: 26 March 2019 Accepted: 10 May 2019 Published: 04 December 2019 Issue date: December 2019
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Publication history
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Publication history

Received: 24 January 2019
Revised: 26 March 2019
Accepted: 10 May 2019
Published: 04 December 2019
Issue date: December 2019

Copyright

© The author(s) 2019

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 11572277, 11772287, 11802260) and the Young and Middle-aged Scholar Training Program of Hunan Province Association for Science and Technology (2017TJ-Q02), the Natural Science Foundation of Hunan Province (No. 2018JJ3490), and the Research Learning and Innovative Experimental Plan for College students of Xiangtan University (No. 2017XJ033).

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