Determination of Fracture Toughness and Fracture Probability of LPS Aluminas by Hertzian Indentation

Abstract:

Article Preview

The Hertzian indentation technique has been evaluated as a possible means of assessing the surface fracture behaviour of a set of qualitatively similar liquid phase sintered polycrystalline aluminas with systematically varied composition, and a range of grain sizes. The method provides a better correlation between microstructure characteristics and surface fracture behaviour than does Vickers indentation. The fracture toughness determined from Hertzian indentations was found to be a function of grain size, irrespective of the composition of the material. The cumulative probabilities of formation of ring cracks at specific loads during indentation with a spherical indenter were determined for each material from the set of 25 measurements, and the parameters of distribution of the probability of fracture were calculated. A statistical correlation between the failure probability distribution and the size distribution of alumina grains was detected.

Info:

Periodical:

Edited by:

J. Dusza, R. Danzer and R. Morrell

Pages:

308-311

DOI:

10.4028/www.scientific.net/KEM.290.308

Citation:

D. Galusek et al., "Determination of Fracture Toughness and Fracture Probability of LPS Aluminas by Hertzian Indentation", Key Engineering Materials, Vol. 290, pp. 308-311, 2005

Online since:

July 2005

Export:

Price:

$38.00

[1] Anya C.C., Roberts S.G., J. Eur. Ceram. Soc., Vol. 16 (1996), p.1107.

[2] Warren P.D., J. Eur. Ceram. Soc., Vol. 15 (1995), p.201.

[3] P.D. Warren, S.G. Roberts, A. Franco, C.C. Anya, In: British Ceramic Proceedings, Vol. 57, Advances in Characterisation of Ceramics, Ed. R. Freer, pp.177-88, (The Institute of Materials, London, 1997).

In order to see related information, you need to Login.