Coating Mechanics
AimsBefore you startIntroductionMisfit strainsForce and moment balancesThe biaxial modulusThe Stoney Equation - the Thin Coating LimitSpallation (Interfacial Debonding)SummaryQuestionsGoing furtherTLP creditsTLP contentsShow all contentViewing and downloading resourcesAbout the TLPsTerms of useFeedbackCredits Print this page
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Aims
On completion of this tutorial you should:
- Appreciate the meaning of a misfit strain between the stress-free (in-plane) dimensions of two layers
- Understand how misfit strains can arise and how they give rise to stresses and strains in the layers, depending on their elastic properties and thicknesses
- See how the general case is simplified when one of the layers (a coating) is much thinner than the other (a substrate) and understand the Stoney equation
- Be able to predict the curvature that tends to arise in such systems
- Be able to predict whether debonding is likely to occur, given the value of the interfacial fracture energy