AN INVESTIGATION INTO THE EFFECT OF CRITICAL PARAMETERS ON RESIDUAL STRESS BUILD-UP IN THERMAL BARRIER COATING

Year 2015, , 44 - 58, 01.03.2015

B. Srivathsa D.K. Das

https://doi.org/10.24107/ijeas.251245

Abstract

Thermal barrier coatings (TBCs) are widely used on different hot components of gas turbine engines such as
blades and vanes. Although, several mechanisms for the failure of the TBCs have been suggested, it is largely
accepted that the durability of these coatings is primarily determined by the residual stresses that are developed
during the thermal cycling. In the present study, the residual stress build-up in an electron beam physical
vapour deposition (EB-PVD) based TBC on a coupon during thermal cycling has been studied by varying three
parameters such as cooling rate, TBC thickness and substrate thickness. A two-dimensional thermo-mechanical
plane strain finite element simulations have been performed for thousand cycles. It was observed that these
variations change the stress profile significantly and stress severity factor increases non-linearly. Overall, the
predictions of the model agree with reported experimental as well as simulated results.

Keywords

Thermal barrier coatings, residual stress, Modeling and simulation

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