Abstract
This paper examines several important issues concerning the mechanical properties of coatings, films, and layers. Major emphasis has been placed on descriptions of residual stresses and their influence on mechanical failure of the coating. The residual stresses are shown to depend on the details of the coating or oxidation process, the general curvature of the substrate, the waviness of the coating-substrate interface, and the stress relaxation characteristics of the coating. Residual stress-induced coating failures, which consist either of coating fractures or spalling, are described. The latter is usually more serious and has been afforded primary attention. It is shown that spalling of the coating is a consequence of buckling, when the coating is subject to significant residual compression. The conditions needed to induce buckling and subsequent spalling are described.
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Evans, A.G., Crumley, G.B. & Demaray, R.E. On the mechanical behavior of brittle coatings and layers. Oxid Met 20, 193–216 (1983). https://doi.org/10.1007/BF00656841
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DOI: https://doi.org/10.1007/BF00656841