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Fracture of ceramic/ceramic/polymer trilayers for biomechanical applications
Author(s) -
Deng Yan,
Miranda Pedro,
Pajares Antonia,
Guiberteau Fernando,
Lawn Brian R.
Publication year - 2003
Publication title -
journal of biomedical materials research part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.849
H-Index - 150
eISSN - 1552-4965
pISSN - 1549-3296
DOI - 10.1002/jbm.a.10161
Subject(s) - materials science , composite material , ceramic , brittleness , fracture (geology) , coating , veneer , cracking , inner core , modulus , layer (electronics) , bilayer , indentation , genetics , membrane , biology
Fracture damage in trilayers consisting of outer and inner brittle layers bonded to a compliant (polycarbonate) substrate and subjected to concentrated surface loading is analyzed. The principal mode of fracture is radial cracking at the undersurface of the inner (core) layer, even in the strongest of core ceramics—other damage modes, including radial cracking in the outer (veneer) layer, are less invasive in these all‐brittle coating systems. Tests on simple trilayer structures fabricated from glasses, sapphire, and dental ceramics are used to examine the dependence of the critical load for radial fracture in terms of relative outer/inner layer thickness and modulus, and inner layer strength. An explicit relation for the critical load, based on a flexing plate model in which the outer/inner bilayer is reduced to an “equivalent” monolithic coating with “effective” composite modulus, is used to examine these dependencies. The theoretical relation describes all the major trends in the critical load data over a broad range of variables, thus providing a sound basis for trilayer design. Relevance of the analysis to dental crowns and other biomechanical applications is a central theme of the study. © 2003 Wiley Periodicals, Inc. J Biomed Mater Res 67A: 828–833, 2003