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Effect of an adhesive interlayer on the fracture of a brittle coating on a supporting substrate

Published online by Cambridge University Press:  31 January 2011

Jong Ho Kim ,
Pedro Miranda ,
Do Kyung Kim  and
Brian R. Lawn
Jong Ho Kim
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Yusong, Taejon 305–701, Korea
Pedro Miranda
Affiliation:
Departamento de Electrónica e Ingeniería Electromecánica, Escuela de Ingenierías Industriales, Universidad de Extremadura, 06071 Badajoz, Spain
Do Kyung Kim
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Yusong, Taejon 305–701, Korea
Brian R. Lawn
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
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Abstract

The role of a compliant adhesive interlayer in determining critical conditions for radial fracture at the undersurfaces of brittle coatings bonded to substrates of dissimilar materials is investigated. Semi-empirical relations for the critical loads are derived by treating the adhesive as part of an effective substrate, thereby reducing the problem to that of a bilayer. A finite-element analysis of a model silicon/epoxy/glass system is used to evaluate adjustable parameters in the analytical relations. In situ experimental observations of crack initiation on the same material system are used to verify these relations. The critical loads depend sensitively on the adhesive thickness and modulus. Delamination at the interface in poorly bonded specimens greatly reduces the critical loads. This analysis affords a basis for predicting the prospective fracture resistance of brittle coatings joined by adhesives.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 1 , January 2003 , pp. 222 - 227
Copyright
Copyright © Materials Research Society 2003

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