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Mode frequency analysis of antisymmetric angle-ply laminated composite stiffened hypar shell with cutout

to provide the accessibility of parts of the structures, and also to alter the resonant frequency. Shells with cutout stiffened along the margin are an efficient way to enhance the stiffness of the structure without adding much mass. These stiffeners slightly increase the overall weight of the structure but have positive effect on the structural strength and stability. So to apprehend the laminated composite stiffened hypar shells with cutout and to use this shell form efficiently, its characteristics under vibration need to be explored comprehensively. The

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