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Finite element study of multi-modal vibration damping for multifunctional thermal barrier coating applications

Filippo Casadei (Harvard university), Katia Bertoldi (Harvard University), David Clarke ()

Advancement in Coating Science and Technology

Mon 2:40 - 4:00

RI Hall 108

A physically-based computational model is developed to predict the damping behavior of complex thermal barrier coating systems. The constitutive damping behavior of defective oxides is derived form the theory of point defect relaxation in crystalline solids and implemented within a finite element framework. The direct frequency response method, as well as the modal strain energy method have been implemented to evaluate the functional dependance of damping on temperature and frequency in complex systems. Numerical results are validated through limited experimental data available in the literature, and new results are presented to illustrate the effects of different topcoat oxides. This research also illustrates how the developed methodology allows predicting the damping capacity of different vibration modes, and to estimate the sensitivity of the design for varying geometrical parameters.