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A quantitative analysis of the indentation fracture of fused silica
Author(s) -
Li Changsheng,
Zhang Liangchi,
Sun Lin,
Yang Shuming,
Wu Chuhan,
Long Xingyuan,
Ding Jianjun,
Jiang Zhuangde
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16645
Subject(s) - materials science , indentation , conical surface , composite material , stress field , cracking , fracture mechanics , fracture (geology) , strain energy release rate , stress (linguistics) , machining , linear elasticity , dilation (metric space) , structural engineering , geometry , metallurgy , finite element method , linguistics , philosophy , mathematics , engineering
It is unclear how the densification of fused silica influences the damage of its precision optics subjected to machining. This paper presents a quantitative analysis of the indentation fracture of fused silica involving densification with the embedded center of dilation (ECD) model. The Hertzian stress field and the ECD‐induced stress field were superposed to provide the overall stress distribution in the loading stage. A new method was established to accurately determine the strength of the ECD‐induced stress field with densification effects. With the aid of the ECD model, the starting locations, initiation stages and initiation sequence of crack morphologies were predicted by analyzing the stress fields. To quantitatively study the initiation of conical cracks in fused silica, the strain energy release rate was calculated by linear elastic fracture mechanics (LEFM). The predicted minimum threshold load leading to conical cracking was consistent with the measured values.