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Research Article | Open Access

A new methodology to obtain the fracture toughness of YAG transparent ceramics

Haomin WANGa, Zhangyi HUANGb, Jianqi QIb,c, Jun WANGd( )
Institute for Advanced Study, Chengdu University, Chengdu 610106, China
College of Physical Science and Technology, Sichuan University, Chengdu 610064, China
Key Laboratory of High Energy Density Physics and Technology of Ministry of Education, Sichuan University, Chengdu 610064, China
School of Physics and Electronic Engineering, Sichuan University of Science & Engineering, Zigong 643000, China
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Abstract

A new methodology was proposed for testing the fracture toughness of YAG transparent ceramics depended on temperature. In our model, the fracture toughness, as a material-specific property, can be expressed as tensile strength treated as the physical property or a material constant. Using this method, a suitable size larger than the inherent defects of ceramic samples and the creation of atomically sharp pre-cracks on the surface of ceramic specimens were able to be ignored. Besides, the fracture of ceramic can be described as the equivalence between the release of elastic storage energy and surface energy associated with the new fracture surface. From thermodynamics theory, the system’s internal energy includes the kinetic energy of atomic motion and the potential energy between atoms in the system. Finally, the fracture toughness at different temperatures can also be calculated by this simple quantitative relationship. In order to confirm the validity of this model, the decreasing fracture toughness of YAG transparent ceramic with increasing temperature was predicted, and the result coincided with the experimental results.

Keywords

fracture toughnessfracture strengthtransparent ceramichigh temperatureYAG ceramic

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Journal of Advanced Ceramics
Volume 8 Issue 3,
September 2019
Pages 418-426
DOI: 10.1007/s40145-019-0324-6
Cite this article:
WANG H, HUANG Z, QI J, et al. A new methodology to obtain the fracture toughness of YAG transparent ceramics. Journal of Advanced Ceramics, 2019, 8(3): 418-426. https://doi.org/10.1007/s40145-019-0324-6

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Received: 16 November 2018
Revised: 04 March 2019
Accepted: 09 March 2019
Published: 31 July 2019
© The author(s) 2019

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