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PUBLICATIONS

Contact-Induced Damage in Ceramic Coatings on Compliant Substrates: Fracture Mechanics and Design

Published

Author(s)

Y W. Rhee, H W. Kim, Y N. Deng, Brian R. Lawn

Abstract

Simple explicit relations are presented for the onset of competing fracture modes in ceramic coatings on compliant substrates from Hertzian-like contacts. Special attention is given to a deleterious mode of radial cracking that initiates at the lower coating surface beneath the contact, in addition to traditional cone cracking and quasiplasticity in the near-contact area. The critical load relations are expressed in terms of well-documented material parameters-elastic modulus, toughness and hardness; and geometrical parameters (coating thickness and sphere radius). Data from selected glass, Al2O3 and ZrO2 coating materials on polycarbonate substrates are used to demonstrate the validity of the relations. The formulation provides a basis for designing ceramic coatings with optimum damage resistance.
Citation
Journal of the American Ceramic Society
Volume
84
Issue
No. 5
Pub Type
Journals

Keywords

brittle coatings, cone crack, elastic modulus, hardness, Hertzian contact, quasiplasticity, radial cracking, strength, toughness

Citation

Rhee, Y. , Kim, H. , Deng, Y. and Lawn, B. (2001), Contact-Induced Damage in Ceramic Coatings on Compliant Substrates: Fracture Mechanics and Design, Journal of the American Ceramic Society (Accessed May 17, 2024)

Issues

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Created May 1, 2001, Updated February 17, 2017