The feasibility of using magnetomechanical coating for enhancing high damping capacity on turbine blades is investigated. An analytical procedure is developed for modeling the dynamic behavior of beams and blades coated with a plasma sprayed iron-chromium based coating. A probabilistic distribution function proposed by Smith and Birchak (1968, 1969) is used to evaluate and qualify the stress or strain distribution on the coating material. The equations of motion and associated boundary conditions are derived for uniform coated beams and blades. The resulting equation of motion is solved for simply supported and cantilevered beams and blades with a free surface coating layer by a closed form procedure and finite element approximation. The results show that a 2–5% beam and blade thickness free surface magnetomechanical coating layer can have a significant contribution on the damping enhancement and the reduction of vibratory stresses.

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