Paper Titles
Machining Cracks in Finished Ceramics
p.1
Edge Flaking - Similarity between Quasistatic Indentation and Impact Mechanisms for Brittle Materials
p.14
Effect of Indenter Materials on Indentation Fracture of Alumina Ceramics
p.23
Scratchability of Soda-Lime Silica (SLS) Glasses: Dynamic Fracture Analysis
p.31
Fracture Toughness of Ceramic Materials and Its Relationship to Chipping Formation
p.39
Strength and Fractography of Piezoceramic Multilayer Stacks
p.46
Thermography and Simulation as a Combined Method for Failure Analysis of PTCs
p.54
Fracture Origins in Miniature Silicon Carbide Structures
p.62
Nanofractography of Alumina by Scanning Probe Microscopy
p.70

Effect of Indenter Materials on Indentation Fracture of Alumina Ceramics

Article Preview

Abstract:

The present study describes the effect of indenter materials on Hertzian cracking behavior of alumina ceramics in sphere indentation. Numerical analysis (FEM) was carried out to investigate the influence of the frictional resistance at the interface due to the elastic mismatch between the indenter and the flat specimen on the stress distribution near the contact area. Two kinds of alumina ceramics with different mechanical properties were used for the flat specimen. Materials of the sphere indenter were cemented carbide, silicon nitride, alumina and hardened steel. The indenter was penetrated into the specimen with an electro-mechanical testing apparatus at a constant cross-head-speed in air. The indentation fracture was monitored with the acoustic emission signal. The numerical analysis revealed that the frictional resistance had influenced on the stress distribution. The experimental data showed that the ring crack radius, the crack pass below the contact zone and the indentation strength were different depending on the indenter material. From the comparison between the numerical analysis and the experimental data, it was found that the minimum value of the ring crack radius of the low density alumina flat specimen corresponds to the position of the maximum tensile stress.

You might also be interested in these eBooks
Fractography of Advanced Ceramics II View Preview

Info:

Periodical:

Key Engineering Materials (Volume 290)

Pages:

23-30

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.290.23

Citation:

Cite this paper

Online since:

July 2005

Authors:

Hatsuhiko Usami, Tomoya Kadomae, Daisuke Igimi, Mineo Mizuno

Keywords:

Alumina Ceramic, Crack Pass, Finite Element Model (FEM), Indentation Fracture, Strain Restriction

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2005 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] F. C. Frank and B. R. Lawn: On the Theory of Hertzian Fracture, Proc. Roy. Soc. Lond., A299 (1967), p.291.

Google Scholar

[2] Hertz B. R. Lawn: Indentation of ceramics with spheres: A century after Hertz, J. Am. Ceram. Soc., Vol. 81, No. 8 (1998), p. (1977).

DOI: 10.1111/j.1151-2916.1998.tb02580.x

Google Scholar

[3] B. R. Lawn and T. R. Wilshaw: Indentation Fracture: Principles and Applications, J. Mater. Sci., Vol. 10, No. 6 (1975), p.1049.

DOI: 10.1007/bf00823224

Google Scholar

[4] B. R. Lawn et al: Model of Strength Degradation from Contact Damage in Tough Ceramics, J. Am. Ceram. Soc., Vol. 81, No. 6 (1998), p.1509.

Google Scholar

[5] H. Usami et al: Cracking Behavior of Fused Silica in Sphere Indentation, Inter. J., Japanese Society of Mechanical Engineering Series A, Vol. 46, No. 3 (2003), p.415.

Google Scholar

[6] A. C. Fischer-Cripps and B. R. Lawn: Stress Analysis of Contact Deformation in Quasi-Plastic Ceramics, J. Am. Ceram. Soc., Vol. 79, No. 10 (1996), p.2609.

DOI: 10.1111/j.1151-2916.1996.tb09023.x

Google Scholar

[7] K. L. Johnson et al: The Effect of the Indenter Elasticity on the Hertzian Fracture of Brittle Materials, Proc. Roy. Soc. Lond., A334 (1973) , p.95.

DOI: 10.1098/rspa.1973.0082

Google Scholar