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This paper focuses on the isogeometric vibration analysis of curvilinearlystiffened composite panels. The stiffness matrices and the mass matrices arederived using the first-order shear deformation theory (FSDT). The presentmethod models the plate and the stiffener separately, which allows thestiffener element nodes to not coincide with the plate shell-element nodes. Thestiffness and mass matrices of a stiffener are transformed to those of theplate through the displacement compatibility conditions at the plate/stiffenerinterface by interpolation using NURBS basis functions. Cutouts are modeledusing a single NURBS patch generated by creating a ruled surface between twocurves. The proposed formulation is first validated by comparing it withavailable literature. The effects of width-to-thickness ratio, fiberorientation, ply layups, shape and size of the cutouts and the boundaryconditions on the response of stiffened composite plates are then analyzed andthe numerical results are used to derive useful conclusions.

Free Vibration analysis of Curvilinearly Stiffened Composite plates with an arbitrarily shaped cutout using Isogeometric Analysis