Porz, Lukas ; Sai, Wei ; Zhao, Jiamin ; Patterson, Eric A. ; Liu, Bin (2015)
Characterizing Brittle Fracture by Modeling Crack Deflection Angles
from the Microstructure.
In: Journal of the American Ceramic Society, 98 (12)
doi: 10.1111/jace.13822
Article, Bibliographie
Abstract
This study introduces a simple analytical model for fracture toughness to bridge the length scales from grain size to bulk thickness by assembling a virtual crack path from the angles recorded on an unfractured microstructure, which is a great challenge in fracture mechanics due to the high geometrical complexity. Good agreement is found between a crack deflection angle distribution measured from 5764 crack segments and the prediction by the model and the possible influence of residual stress is quasi quantitatively discussed. A total of 7.4% of the crack segments observed acted as crack bridges, while 7.3% was predicted by the model. A quantification of how high an angle needs to be to turn crack deflection into crack bridging is given. The ratio of fracture toughness from grain boundary to grain, G1c(gb)/G1c(g), was measured indirectly from all samples to be between 0.3 and 0.35.
| Item Type: | Article |
|---|---|
| Erschienen: | 2015 |
| Creators: | Porz, Lukas ; Sai, Wei ; Zhao, Jiamin ; Patterson, Eric A. ; Liu, Bin |
| Type of entry: | Bibliographie |
| Title: | Characterizing Brittle Fracture by Modeling Crack Deflection Angles from the Microstructure |
| Language: | English |
| Date: | 19 December 2015 |
| Journal or Publication Title: | Journal of the American Ceramic Society |
| Volume of the journal: | 98 |
| Issue Number: | 12 |
| DOI: | 10.1111/jace.13822 |
| Abstract: | This study introduces a simple analytical model for fracture toughness to bridge the length scales from grain size to bulk thickness by assembling a virtual crack path from the angles recorded on an unfractured microstructure, which is a great challenge in fracture mechanics due to the high geometrical complexity. Good agreement is found between a crack deflection angle distribution measured from 5764 crack segments and the prediction by the model and the possible influence of residual stress is quasi quantitatively discussed. A total of 7.4% of the crack segments observed acted as crack bridges, while 7.3% was predicted by the model. A quantification of how high an angle needs to be to turn crack deflection into crack bridging is given. The ratio of fracture toughness from grain boundary to grain, G1c(gb)/G1c(g), was measured indirectly from all samples to be between 0.3 and 0.35. |
| Divisions: | 11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials |
| Date Deposited: | 04 Jan 2016 16:30 |
| Last Modified: | 23 Oct 2020 09:16 |
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