Study of Fracture Mechanism of Machinable Mica Glass-Ceramics under Quasi-Static Conditions
- Authors: Hui Yu 1,2, Li W.2, Zhu W.1, Wu H.1
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Affiliations:
- Key Laboratory of Advanced Manufacturing Technology in Jiangsu Province
- College of Mechanical Engineering, Yanshan University
- Issue: Vol 45, No 6 (2019)
- Pages: 555-564
- Section: Article
- URL: https://journals.rcsi.science/1087-6596/article/view/217656
- DOI: https://doi.org/10.1134/S1087659620010083
- ID: 217656
Cite item
Abstract
In order to study the deformation and fracture mechanism of machinable mica glass ceramics under different loading modes, quasi-static uniaxial tensile and compression experiments are designed and analyzed based on the obtained quasi-static stress-strain curves at different strain rates, the macroscopic and microscopic fracture morphology of the samples and the nano-indentation experiment. The results show that mica glass ceramics are basically elastic brittle bodies. A very short “softening” section before the compression fracture is observed. There is a significant SD (tensile and compressive strength difference) effect, and the ratio of compressive to tensile strength is 14. The fracture mechanism of mica glass ceramics is related to the loading mode. The fracture mechanism is normal tensile fracture perpendicular to the loading axis under tensile loading. Under compressive loading, there is a mixed mode of distensile splitting and local shear failure. The microcrack is preferentially nucleated and extends to the weak interface at the junction of two phases, and the critical nucleation load is about 20 mN. The energy consumption mechanism of crack initiation and propagation at the weak interface and cleavage steps are the reason for the softening of the compression end curve.
About the authors
Hui Yu
Key Laboratory of Advanced Manufacturing Technology in Jiangsu Province; College of Mechanical Engineering, Yanshan University
Author for correspondence.
Email: yuhui@ysu.edu.cn
China, Huaian, Jiangsu, 223001; Qinhuangdao, Hebei, 066000
Wei Li
College of Mechanical Engineering, Yanshan University
Email: yuhui@ysu.edu.cn
China, Qinhuangdao, Hebei, 066000
Wei-guo Zhu
Key Laboratory of Advanced Manufacturing Technology in Jiangsu Province
Email: yuhui@ysu.edu.cn
China, Huaian, Jiangsu, 223001
Hai-bing Wu
Key Laboratory of Advanced Manufacturing Technology in Jiangsu Province
Email: yuhui@ysu.edu.cn
China, Huaian, Jiangsu, 223001
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