Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 84, Issue 3, Pages 561-565Publisher
WILEY
DOI: 10.1111/j.1151-2916.2001.tb00698.x
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Simple relations for the onset of competing brittle and quasi-plastic damage modes in Hertzian contact are presented. The formulations are expressed in terms of well-documented material parameters, elastic modulus, toughness, and hardness, enabling a priori predictions for given ceramics and indenter radii. Data from a range of selected ceramic land other) materials are used to demonstrate the applicability of the critical load relations, and to evaluate coefficients in these relations. The results confirm that quasi plasticity is highly competitive with fracture in ceramics, over a sphere radius range 1-10 mm, Implications concerning the brittleness of ceramics in the context of indentation size effects are discussed.
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