Cutouts are often provided in composite structural components for practical reasons. For instance, aircraft components such as wingspar, fuselage and ribs are provided with cutouts for access, inspection, fuel lines and electric lines or to reduce the overall weight. This paper addresses the effect of boundary condition on buckling and postbuckling responses, failure loads, and failure characteristics of composite laminate with various shaped cutouts (i.e., circular, square, diamond, elliptical-vertical and elliptical-horizontal) and having different lay-ups under in-plane shear (positive and negative) load, using finite-element method. The FEM formulation is based on the first order shear deformation theory in conjunction with geometric nonlinearity using von Karman’s assumptions. 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 effect of boundary condition on buckling, first-ply failure and ultimate failure loads of a quasi-isotropic laminate with cutout is more for positive shear load than that for the negative shear load for almost all cutout shapes. It is also noted that under in-plane shear loads postbuckling stiffness of (0/90)4s laminate with circular cutout is maximum, while it is minimum for (45/—45)4s laminate with circular cutout, irrespective of boundary conditions.
 S. B. Singh and D. Kumar, “Postbuckling Response and Failure of Symmetric Laminated Plates with Rectangular Cutouts under Uniaxial Compression,” Structural Engineering and Mechanics, Vol. 29, No. 4, 2008, pp. 455-467.
 T. Ozden, “Analysis of Critical Buckling Load of Laminated Composites Plate with Different Boundary Conditions Using FEM and Analytical Methods,” Computational Materials Science, Vol. 45, No. 4, 2009, pp. 1006-1015. doi:10.1016/j.commatsci.2009.01.003
 S. K. Panda and L. S. Ramachandra, “Buckling of Rectangular Plates with Various Boundary Conditions Loaded by Non-Uniform In-Plane Loads,” International Journal of Mechanical Sciences, Vol. 52, No. 6, 2010, pp. 819-828. doi:10.1016/j.ijmecsci.2010.01.009
 D. Kumar and S. B. Singh, “Effects of Boundary Conditions on Buckling and Postbuckling Responses of Composite Laminate with Various Shaped Cutouts,” Composite Structures, Vol. 92, No. 3, 2010, pp. 769-779. doi:10.1016/j.compstruct.2009.08.049
 S. B. Singh and D. Kumar, “Postbuckling Response and Failure of Symmetric Laminated Plates with Rectangular Cutouts under In-Plane Shear,” Structural Engineering and Mechanics, Vol. 34, No. 2, 2010, pp. 175-188.
 Y. Zhang and F. L. Matthews, “Postbuckling Behaviour of Anisotropic Laminated Plates under Pure Shear and Shear Combined with Compressive Loading,” Journal of American Institute of Aeronautics and Astronautics, Vol. 22, No. 2, 1984, pp. 281-286.
 S. B. Singh and A. Kumar, “Postbuckling Response and Failure of Symmetric Laminates under In-Plane Shear,” Composite Science and Technology, Vol. 58, No. 12, 1998, pp. 1949-1960. doi:10. 1016/S0266-3538(98)00032-3
 V. O. Britt, “Shear and Compression Buckling Analysis for Anisotropic Panels with Elliptical Cutouts,” Journal of American Institute of Aeronautics and Astronautics, Vol. 32, No. 11, 1994, pp. 2293-2299.
 G. J. Turvey and K. Sadeghipour, “Shear Buckling of Anisotropic Fibre-Reinforced Rectangular Plates with Central Circular Cutouts,” Proceedings of the International Conference Computer Aided Design in Composite Material Technology, Southampton, 1988, pp. 459-473.
 S. Vellaichamy, B. G. Prakash and S. Brun, “Optimum Design of Cutouts in Laminated Composite Structures,” Computers & Structures, Vol. 37, No. 3, 1990, pp. 241-246. doi:10.1016/0045-7949(90)90315-S
 P. Jain and A. Kumar, “Postbuckling Response of Square Laminates with a Central Circular/Elliptical Cutout,” Composite Structures, Vol. 65, No. 2, 2004, pp. 179-185. doi:10.1016/j.compstruct. 2003.10.014
 S. J. Guo, “Stress Concentration and Buckling Behaviour of Shear Loaded Composite Panels with Reinforced Cutouts,” Composite Structures, Vol. 80, No. 1, 2007, pp. 1-9. doi:10.1016/j.compstruct. 2006.02.034
 S. Guo, R. Morishima, X. Zhang and A. Mills, “Cutout Shape and Reinforcement Design for Composite C-Section Beams under Shear Load,” Composite Structures, Vol. 88, No. 2, 2009, pp. 179-187. doi:10.1016/j.compstruct.2008.03.001
 D. Kumar and S. B. Singh, “Postbuckling Strengths of Composite Laminate with Various Shaped Cutouts under In-Plane Shear,” Composite Structures, Vol. 92, No. 12, 2010, pp. 2966-2978. doi:10.1016/j.compstruct.2010.05.008