Geometrically non-linear analysis including shear deformation of compositelaminates

Geometrically non-linear deformations of composite laminated plates are com puted using the perturbation finite element method (PFEM). The PFEM is more economic in terms of computational time than conventional finite element i terative procedure, and results in semi-analytic solutions because deformat ions are polynomial functions of external loads, and vice-versa, To account for the transverse shear effect on deformation of a laminated plate. a dis crete-layer sheer deformation theory is introduced. This approach predicts more accurately the distribution of displacements and stresses through the thickness than single-layer theories. Detailed derivation of the theory is presented in the paper. A three-node triangular element model and computer program have been developed and implemented as part of this study. Computed numerical results of several examples show that the perturbation finite el ement solutions are in good agreement with exact solution, experimental dat a and calculated numerical result from other investigators. (C) 1999 Elsevi er Science Ltd. All rights reserved.