Thermal cycling induced crack nucleation and propagation in thermal barrier coating system

Yongle Sun*, Weixu Zhang, Man Tian, T. J. Wang

*Corresponding author for this work

    Research output: Chapter in Book/Conference proceedingConference contributionpeer-review

    Abstract

    Failure of thermal barrier coating (TBC) system is associated with the morphological imperfection of thermally grown oxide (TGO) layer. The objective of this work is to numerically investigate the crack nucleation and propagation in TBC system upon thermal cycling based on a cohesive zone model, in which TGO thickness imperfection effect is incorporated. The results show that TGO/BC (bond coat) interface is subjected to high tensile stress in the vicinity of TGO thickness imperfection during thermal cycling, thereby inducing crack nucleation. Owing to the plastic deformation of BC, fracture behavior of TGO/BC interface is related to BC yield strength for a typical thermal growth rate of TGO. Furthermore, the embedded oxide in BC could be also ruptured as a result of the increasing transverse stress, which will lead to the coalescence of adjacent cracks.

    Original languageEnglish
    Title of host publicationFracture and Strength of Solids VII
    Pages383-388
    Number of pages6
    DOIs
    Publication statusPublished - 4 Feb 2011
    Event8th International Conference on Fracture and Strength of Solids 2010, FEOFS2010 - Kuala Lumpur, Malaysia
    Duration: 7 Jun 20109 Jun 2010

    Publication series

    NameKey Engineering Materials
    Volume462-463
    ISSN (Print)1013-9826

    Conference

    Conference8th International Conference on Fracture and Strength of Solids 2010, FEOFS2010
    Country/TerritoryMalaysia
    CityKuala Lumpur
    Period7/06/109/06/10

    Keywords

    • Cohesive zone model
    • Crack
    • Thermal barrier coating
    • Thermal cycling

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