Numerical Simulation of Volcanic Ash Infiltration into Thermal Barrier Coatings

Masayuki Arai; Yuta Fukushima; Kiyohiro Ito

doi:10.4028/www.scientific.net/KEM.827.367

Paper Titles

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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An Approach for Predicting the Initiation of Ductile Fracture in Plane Strain Rolling
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Study of the Viscoelasticity of Chopped Aramid Fiber Reinforced Rubber Composite
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Crack Initiation Mechanism of Hydrogen Induced Cracking in Nickel
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Numerical Simulation of Volcanic Ash Infiltration into Thermal Barrier Coatings

Abstract:

CMAS attack is known to occur owing to the deposition of volcanic ash onto thermal barrier coating (TBC) surface at a high-temperature environment. The serious problem is TBC spallation resulting from the infiltration of molten volcanic ash into the porous microstructure of TBC. The infiltration induces inner stress and phase transformation, which directly results in those serious problems. In this study, the diffusional equation for expressing the infiltrating process of the molten ash into the porous structure of TBC and the associated constitutive equation considered regarding phase transformation are formulated. The equations are installed into commercial finite element (FE) code (MARC) using the user subroutine. The numerical simulation results are compared with the cross-sectional SEM observation for the volcanic-ash-deposited TBC sample exposed at a high-temperature to confirm verification of the model proposed herein.