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Research Article | Open Access

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

Weiguo MAOa, Yujie WANGa, Jun SHIa, Huiyu HUANGa, Yuncheng WANGb, Liang LVb, Haoyong YANGa, Chen ZOUa, Cuiying 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
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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 coatingX-ray computed tomographybending fracturegeometrical reconstructioncracking strain

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Journal of Advanced Ceramics
Volume 8 Issue 4,
December 2019
Pages 564-575
DOI: 10.1007/s40145-019-0340-6
Cite this article:
MAO W, WANG Y, SHI J, et al. Bending fracture behavior of freestanding (Gd0.9Yb0.1)2Zr2O7 coatings by using digital image correlation and FEM simulation with 3D geometrical reconstruction. Journal of Advanced Ceramics, 2019, 8(4): 564-575. https://doi.org/10.1007/s40145-019-0340-6

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Received: 24 January 2019
Revised: 26 March 2019
Accepted: 10 May 2019
Published: 04 December 2019
© The author(s) 2019

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