Characterisation Of Contact Damage In
Porcelainlmetal And Porcelain/polymer Bilayers
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
Keywords
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