Thermal stresses in bi-coated structures

Mauro Ferrari, Luca Lutterotti

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

The thermoelastic problem of a three-phase concentric sphere subject to phasewise uniform temperature variations is solved exactly. With this solution, the cool-down stresses in a metallic structure with plasma-sprayed oxidation- and thermal-barrier coatings are determined. In this context, the relevance of several control parameters is examined, including the Poisson ratios of both coatings and the substrate temperature during deposition. The thin-film approximation to the subject problem is derived, and it is shown that the response of the two barrier layers is essentially uncoupled. In particular, the thermoelastic properties of the intermediate layer have a negligible effect on the stresses in the outermost layer. It is then conclude that the most relevant stress-control variable is the substrate deposition temperature.

Original languageEnglish (US)
Pages (from-to)1928-1938
Number of pages11
JournalJournal of Engineering Mechanics
Volume118
Issue number9
DOIs
StatePublished - Jan 1 1992

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering

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