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Characterizing Brittle Fracture by Modeling Crack Deflection Angles from the Microstructure

Porz, Lukas and Sai, Wei and Zhao, Jiamin and Patterson, Eric A. and Liu, Bin (2015):
Characterizing Brittle Fracture by Modeling Crack Deflection Angles from the Microstructure.
In: Journal of the American Ceramic Society, pp. 3690-3698, (98), ISSN 00027820, [Article]

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 and Sai, Wei and Zhao, Jiamin and Patterson, Eric A. and Liu, Bin
Title: Characterizing Brittle Fracture by Modeling Crack Deflection Angles from the Microstructure
Language: English
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.

Journal or Publication Title: Journal of the American Ceramic Society
Number: 98
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
Identification Number: doi:10.1111/jace.13822
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