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

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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.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 305-701, Yusong, Taejon, Korea

    Jong Ho Kim & Do Kyung Kim

  2. Departamento de Electrónica e Ingeniería Electromecánica, Escuela de Ingenierías Industriales, Universidad de Extremadura, 06071, Badajoz, Spain

    Pedro Miranda

  3. Materials Science and Engineering Laboratory, National Institute of Standards and Technology, 20899, Gaithersburg, Maryland, USA

    Brian R. Lawn

Authors
  1. Jong Ho Kim
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  2. Pedro Miranda
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  3. Do Kyung Kim
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  4. Brian R. Lawn
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Kim, J.H., Miranda, P., Kim, D.K. et al. Effect of an adhesive interlayer on the fracture of a brittle coating on a supporting substrate. Journal of Materials Research 18, 222–227 (2003). https://doi.org/10.1557/JMR.2003.0031

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  • DOI: https://doi.org/10.1557/JMR.2003.0031

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