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Title: Contact damage of silicon carbide ceramics with different grain structures measured by Hertzian and Vickers indentation
Authors: Wade, James
Ghosh, Santonu
Claydon, Phoebe
Wu, Houzheng
Keywords: Cracking-resistance
Flaw density
Grain structure
Issue Date: 2015
Publisher: Elsevier Ltd (© the authors)
Citation: WADE, J. ... et al, 2014. Contact damage of silicon carbide ceramics with different grain structures measured by Hertzian and Vickers indentation. Journal of the European Ceramic Society, 35 (6), pp.1725–1736.
Abstract: We have used Hertzian and Vickers indentation to investigate contact damage in sintered SiC ceramics, one consisting of uniform, fine-grains and the other a coarse, elongated grain structure. Cracking-resistance measured by Hertzian indentation, showed no discernible difference, nor did the Vickers hardness. However, numerical analysis of the Vickers indentation size effect, performed using the proportional specimen resistance model, indicates 77.3% greater surface energy, mostly realised through cracking, is experienced by heterogeneous SiC per unit area of indentation impression. This is typified by an observable increase in the number of radial cracks generated around Vickers impressions, which has been found to artificially increase the K IC determined by Vickers indentation fracture. Quantitative measurements of pre-existing flaws by Hertzian indentation show that heterogeneous SiC retains a higher density of larger flaws. Relationships between the differences in cracking around Vickers indents and the pre-existing flaw populations of these two SiC ceramics are discussed.
Description: This is an Open Access Article. It is published by Elsevier as Open Access at http://dx.doi.org/10.1016/j.jeurceramsoc.2014.12.030
Version: Published
DOI: 10.1016/j.jeurceramsoc.2014.12.030
URI: https://dspace.lboro.ac.uk/2134/16816
Publisher Link: http://dx.doi.org/10.1016/j.jeurceramsoc.2014.12.030
ISSN: 0955-2219
Appears in Collections:Published Articles (Materials)

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