Abstract
The Young's modulus of thermal barrier coating (TBC) is an essential mechanical property as it is required for calculating the parameters of material mechanics. In this study, we developed the evaluation method of the Young's modulus of TBC based on the primary bending resonance of a TBC system specimen. First, we derived the closed form solution for the Young's modulus of TBC by using the equation of the motion for bending vibration of a composite beam. The solution provides the Young's modulus of TBC by the measured resonance frequency and the known values, which are dimensions, densities, and Young's moduli of subsurface layers. Next, we performed sensitivity analysis of these input errors. It was found that the most important input values were thickness and properties of the substrate. Finally, it was experimentally confirmed that the Young's modulus of TBC was obtained accurately by the method.
