Damage Analysis of Thermal Barrier Coatings Subjected to a High-Velocity Impingement of a Solid Sphere

Kiyohiro Ito; Fei Gao; Masayuki Arai

doi:10.4028/www.scientific.net/KEM.827.349

Paper Titles

Analysis of Maximal Operation Amplitudes of Piezoelectric Vibration Energy Harvesters
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Photoelastic Analysis of the Stressed State of a Flat Element with Geometrical Stress Concentrators (Cutout and Cuts)
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Low Cycle Fatigue Behavior of Superalloy GH4169 in High Temperature Gas Environment
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Comprehensive Numerical Simulation on Thermally Grown Oxide and Internal Stress Evolutions in Thermal Barrier Coatings
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Damage Analysis of Thermal Barrier Coatings Subjected to a High-Velocity Impingement of a Solid Sphere
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Prediction of Indentation Size Formed by a High-Velocity Impingement of a Solid Sphere Based on an Expanding Cavity Model
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Damage Evaluation of TBC by Rapid Thermal Cycling Test Utilizing a Laser Irradiation
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Numerical Simulation of Volcanic Ash Infiltration into Thermal Barrier Coatings
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Morphology Evolution and Probability Characteristic of γ' Phase in Single Crystal Superalloy during Creep Rafting
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Damage Analysis of Thermal Barrier Coatings Subjected to a High-Velocity Impingement of a Solid Sphere

Abstract:

A delamination of thermal barrier coatings (TBC) applied to turbine blades in gas turbine could be caused by a high-velocity impingement of various foreign objects. It is important to accurately predict the size of interfacial crack for safety operation of gas turbine. In this study, in order to establish a practical equation for prediction of the length of interfacial crack, a high velocity impingement test and a finite element analysis (FEA) based on a cohesive model were conducted. As the result, the length of interfacial crack is linearly increased with the impact velocity. In addition, it was confirmed that it was accurately estimated by the FEA. The equation for prediction of the length of interfacial crack was formulated based on these results and the energy conservation before and after impingement. Finally, the applicability of the equation was demonstrated in a wide range of impact velocity through a comparison with the experimental results.