Modelling of Elasto-Plastic Deformation and Crack Propagation Studies in Thermal Barrier Coated Superalloys

Abstract

The present work highlights some of the results on deformation behaviour in elastic plastic condition under bending, for miniature test specimens of thermal barrier coatings (TBCs) on Ni base superalloys. The experimental data was simulated mathematically using beam elements in Finite Element Analysis. The analysis indicated concu-rrence of displacements, for each load case, with the experimental results in the elastic regime. Reasonable extent of concurrence was also obtained in the early stages of plastic deformation of elements. However, minor deviations occurred from experimental results in the case oflauge loads, i. e., large plastic deformation. A comp-uter code was developed considering elastic-plastic finite elements, for four point bend specimens with two degrees of f reedom at each node.