Failure analysis of multiple delaminated composite plates due to bending and impact

The present work aims at the first ply failure analysis of laminated compos ite plates with arbitrarily located multiple delaminations subjected to tra nsverse static load as well as impart. The theoretical formulation is based on a simple multiple delamination model. Conventional first order shear de formation is assumed using eight-noded isoparametric quadratic elements to develop the finite element analysis procedure, Composite plates are assumed to contain both single and multiple delaminations, For the case of impact, Newmark time integration algorithm is employed for solving the time depend ent multiple equations of the plate and the impactor. Tsai-Wu failure crite rion is used to check for failure of the laminate for both the cases. To in vestigate the first ply failure, parametric studies are made For different cases by varying the size and number of delaminations as well, as the stack ing sequences and boundary conditions.