Research Papers - Department of Materials Engineering

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Author: search.filters.author.Thomson, R. CSubject: search.filters.subject.Eshelby

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    MCrAlY creep behaviour modelling by means of finite-element unit cells and self-consistent constitutive equations
    (SAGE Publications, 2009-01-01) Hermosilla, U; Karunaratne, M. S. A; Jones, I. A; Hyde, T. H; Thomson, R. C
    The MCrAlY bond coats (BCs) used in thermal barrier coatings (TBCs) undergo severe microstructural changes that affect their creep behaviour. One method to take into account the effect of the high-temperature degradation in the creep properties of these alloys is by means of unit cell calculations that reproduce the microstructure present in the alloy. However, this method is not suitable to be included in large-scale calculations and a self-consistent constitutive model, based on Eshelby's inclusion technique, is presented for that purpose, showing good numerical agreement. Results are compared with experimental data obtained for several MCrAlY BCs.
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    Modelling the high temperature behaviour of TBCs using sequentially coupled microstructural–mechanical FE analyses
    (Elsevier, 2009-07-15) Hermosilla, U; Karunaratne, M. S. A; Jones, I. A; Hyde, T. H; Thomson, R. C
    Thermal barrier coatings provide a means of thermal insulation of gas turbine components exposed to elevated temperatures. They undergo severe microstructural changes and material degradation, which have been implemented in this work by means of a sequentially coupled microstructural mechanical calculation that made use of a self-consistent constitutive model within finite element calculations. Analyses for different temperatures and bond coat compositions were run, which reproduced the trends reported in previous research and identified the accumulation of high out-of-plane tensile stresses within the alumina layer as an additional phenomenon that could drive high temperature crack nucleation.