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Cracking of Brittle Coatings Adhesively Bonded to Substrates of Unlike Modulus

Published online by Cambridge University Press:  31 January 2011

Kee Sung Lee ,
Young-Woo Rhee ,
Douglas H. Blackburn ,
Brian R. Lawn  and
Herzl Chai
Kee Sung Lee
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
Young-Woo Rhee
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
Douglas H. Blackburn
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
Brian R. Lawn
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
Herzl Chai
Affiliation:
Department of Solid Mechanics, Materials and Structures, Faculty of Engineering, Tel Aviv University, Israel 69978
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Abstract

The role of elastic mismatch in determining critical conditions for indentation fracture in brittle coatings on substrates of unlike modulus was investigated. A model transparent trilayer system, consisting of a glass coating layer bonded to a thick substrate of different glass or polymer by a thin layer of epoxy adhesive, facilitated in situ observations of crack initiation and propagation. A tungsten carbide sphere was used to load the layer system. Abrasion flaws were introduced into the top and bottom glass coating surfaces to control the flaw populations and to predetermine the origins of fracture: cone cracks occurred at abraded top surfaces, radial cracks at abraded bottom surfaces. Analytical relations for the critical loads are presented for each crack system in terms of elastic modulus mismatch, indenter and coating dimensions, and material fracture parameters. Implications concerning materials selection for resistance to crack initiation are considered.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 15 , Issue 8 , August 2000 , pp. 1653 - 1656
Copyright
Copyright © Materials Research Society 2000

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