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

cutout. But the analysis of stiffened shells with cutout for higher modes is scanty in the literature. Some studies [ 24 , 25 ] also reported the mode frequency analysis of laminated spherical and cylindrical shells. However, the analysis of stiffened hypar shells with cutout for higher modes is yet to be reported in literature. Hence, an attempt has been made in the present article to provide some information about the effects of width-to-thickness ratio ( b / h ), degree of orthotropy ( E 11 / E 22 ), and fiber orientation (θ) on the nondimensional natural frequency

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