Hydraulically pumped cone fracture in bilayers with brittle coatings

Herzl Chai, Brian R. Lawn*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

An earlier finite element modeling analysis of inner cone cracks in monolithic brittle solids subject to cyclic indentation in liquids is extended to include the case of a brittle layer bonded to a compliant substrate, using a model glass/polycarbonate bilayer system as an illustrative case study. Provision is made for incorporation of plate flexure stresses, along with hydraulic pumping stresses, into the Hertzian contact field. Tensile flexure stresses ultimately accelerate inner cone cracks through the lower halves of the glass plates to unstable failure. The analysis accounts for the experimentally observed trends in the inner cone crack evolution in cyclic contact fatigue.

Original languageEnglish
Pages (from-to)343-346
Number of pages4
JournalScripta Materialia
Volume55
Issue number4
DOIs
StatePublished - Aug 2006

Funding

FundersFunder number
National Institute of Dental and Craniofacial ResearchPO1 DE10976

    Keywords

    • Bilayers
    • Brittle coatings
    • Cyclic contact
    • Hydraulic pumping
    • Inner cone cracks

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