Analysis of anisotropic, stiffened composite laminates using a continuum-based shell element
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The incremental equations of motion based on the principle of virtual displacements of a continuous medium are formulated using the total Lagrangian description. A degenerate shell element with a degenerate curved beam element as a stiffener is developed for the geometric nonlinear analysis of laminated, anisotropic, stiffened shells. Compatibility and completeness requirements are stressed in modeling the general shell-type structures in order to assure the convergence of the finite-element solution. An iterative solution procedure, either Newton-Raphson method or modified Riks method, is employed to trace the nonlinear equilibrium path. A variety of numerical examples are presented to demonstrate the validity and efficiency of the stiffened shell element. The effects of boundary conditions, lamination scheme and geometric nonlinearity on deflections are also investigated. © 1990.
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