The modeling and formulation of equations of motion for a cracked rotating blade are studied. The proposed model is a Bernoulli-Euler beam with a single transverse crack. Two fields are connected by a local spring element characterizing the reduced stiffness of the crack region. First, the governing nonlinear boundary value problem is derived. Next, the stationary deformation state is dealt with. Finally, the linearized equations of motion for small superimposed oscillations are formulated. The paper corresponds with another one of the same author on cracked rotating shafts and shows that several essential modifications are necessary.

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