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This TLP should provide some insights into the mechanics of bi-layer (coating on substrate) systems. It covers the concept of a misfit strain and the way in which equilibrium is established after its introduction, including the creation of curvature. The differences between "thin" and "thick" coating cases are explained.

	Aims Before you start Introduction Misfit strains Force and moment balances The biaxial modulus The Stoney Equation - the Thin Coating Limit Spallation (Interfacial Debonding) Summary Questions Going further

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First created: August 2017. Last updated: August 2017.

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