Simple formulas for thermoelastic stresses in tbc coatings

M. Ciavarella, P. Decuzzi, V. L. Tagarielli, G. P. Demelio

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Thin coatings on metallic substrates are extensively used in mechanical, aerospace, microelectronic, optical, and medical applications. Coatings affect the surface properties of the system, while bulk properties and strength primarily depend on the substrate. In coated components subjected to thermal cycling, differences in physical properties and chemical nature between constituent parts of coating and substrate can cause thermal stresses, atomic diffusion, and chemical interactions, which decrease high-temperature stability and actual strength of the system. In this article, the micro-structure of a thermal barrier coating is briefly described; then, the temperature field inside the coating is calculated from a transient or a steady periodic state analysis; hence, thermomechanical stresses are analytically determined for a double-layer system with planar or axisymmetric geometry. The present analysis leads to new formulas with which temperature and stress fields can be calculated.

Original languageEnglish (US)
Pages (from-to)409-422
Number of pages14
JournalJournal of Thermal Stresses
Volume26
Issue number5
DOIs
StatePublished - May 2003
Externally publishedYes

Keywords

  • TBC
  • Thermoelastic stresses
  • Thin films

ASJC Scopus subject areas

  • Mechanics of Materials
  • Computational Mechanics
  • Physical and Theoretical Chemistry
  • Fluid Flow and Transfer Processes

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