Author(s)

C. Ford, M. B. Bush & X.-Z. Hu

Abstract

Finite Element Analysis is used to examine contact damage induced by Hertzian indentation of porcelain coatings on various substrates. Critical loads for the onset of substrate plasticity are predicted for a system with plastically deforming substrate. Different forms of cracking in the porcelain coating are studied - "Hertzian" cone cracks close to the indenter, more distant "outer" cone cracks, and "radial" cracking at the coatinglsubstrate interface. The effects of porcelain coating thickness and radius of curvature on the critical stresses for initiation of these cracks are examined. Critical loads to initiate substrate plastic flow are found to increase with coating thickness for a brittle coating on a stiff substrate, as expected. It is determined that the dominant mode of coating crackin

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