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| ANALYSIS OF THERMAL CREEP STRESS EVOLUTION AROUND MICRO-INTERFACIAL REGIONS IN THERMAL BARRIER COATINGS |
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Abstract The creep property of different interfaces in thermal barrier coatings(TBCs) under thermal cyclic loads is a key factor affecting residual stress around micro-interfacial regions, and it contributes to improve TBCs’ stability to explore the relationship between creep and residual stress in TBCs. With the usage of Norton creep model, a four-layer geometric model, consisting of a ceramic layer, an oxide layer, an adhesive layer and a substrate, is established based on thermal elastic-plastic creep theory to study stress evolution law around micro-interfacial regions in TBCs under thermal cyclic loads, in which the number of creep layers and the creep levels are included. Results show that changes in creep parameters and the number of creep layers affect the magnitude and distribution of interfacial residual stress in TBCs, which is of guiding significance on failure prediction of TBCs.
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Received: 08 June 2013
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2014, Vol. 35 
