In this paper, dynamic behavior of a delaminated composite beam is studied. In particular, the effects of nonlinearity due to restriction on the axial stretch of the delaminated segments and nonlinearity due to the deflection-amplitude-dependent axial interaction are studied. The restriction to the axial stretch is due to the rest of the beam in which the delaminated segment is embedded. Perturbation methods are used to study nonlinear normal modes. The effects of nonlinearity on the spatial variation of the normal modes and the amplitude-dependent natural frequencies are discussed.
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