Department of Civil Engineering
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Item Effects of boundary conditions on buckling and postbuckling responses of composite laminate with various shaped cutouts(Elsiever, 2010-02) Singh, Shamsher BahadurThe objective of the present work is to study the effects of flexural boundary conditions on buckling and post-buckling behavior of axially compressed quasi-isotropic laminate, (+45/−45/0/90)2s with various shaped cutouts (i.e., circular, square, diamond, elliptical–vertical and elliptical–horizontal) of various sizes using the finite element method. The FEM formulation is based on first order shear deformation theory and von Karman’s assumptions are used to incorporate geometric nonlinearity. The 3-D Tsai-Hill criterion is used to predict the failure of a lamina while the onset of delamination is predicted by the interlaminar failure criterion. It is observed that the laminates clamped and simply supported on all edges have the highest and lowest buckling and postbuckling strength, respectively, irrespective of cutouts shape and size. It is also noted that a fully clamped laminate with large size elliptical–vertical cutout can take higher compressive buckling load than the laminate without cutout for same boundary condition.Item Postbuckling response and failure of symmetric laminated plates with rectangular cutouts under in-plane shear(Techno Press, 2010-01-30) Singh, Shamsher BahadurThis paper deals with the buckling and postbuckling responses, and the progressive failure of square laminates of symmetric lay-up with a central rectangular cutout under in-plane shear load. A detailed investigation is made to show the effects of cutout size and cutout aspect ratio on the buckling and postbuckling responses, failure loads and failure characteristics of (+45/-45/0/90)2s, (+45/-45)4s and (0/90)4s laminates. The 3-D Tsai-Hill criterion is used to predict the failure of a lamina while the onset of delamination is predicted by the interlaminar failure criterion. In addition, the effects of boundary conditions on buckling loads, failure loads, failure modes, and maximum transverse deflection for a (+45/-45/0/90)2s laminate with and without a square cutout have been presented. It is concluded that because of early onset of delamination at the net section of cutouts before first-ply failure, total strength of the laminate with very small cutouts can not be utilized.Item Buckling and postbuckling response of hybrid composite plates under uniaxial compressive loading(Elsiever, 2020-01) Singh, Shamsher Bahadur