NONLINEAR LIMIT STATE ANALYSIS OF LAMINATED PLATES BY P-VERSION OF F.E.M.

Abstract eng:
A p-version finite element model based on degenerate shell element is proposed for the analysis of orthotropic laminated plates. In the nonlinear formulation of the model, the total Lagrangian formulation is adopted with large deflections and moderate rotations. The material model is based on the Huber-Mises yield criterion and Prandtl-Reuss flow rule in accordance with the theory of strain hardening yield function. The model is also based on extension of equivalent-single layer laminate theory(ESL theory) with shear deformation leading to continuous shear strains at the interface of two layers. The validity of the proposed p-version finite element model is demonstrated through several comparative points of view in terms of ultimate load, convergence characteristics, nonlinear effect, and shape of plastic zone.

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